Measurement value, REC (701)
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Measurement value, REC (701)
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Directions for the measurement of levels and signals at the REC and the measurement values are given on the following pages.
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Note
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When measuring values at the pins the connector must remain plugged into the electrical centre. The pins can be accessed by lifting up the protective cover on the connector.
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•
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Pay attention to the measurement requirements, use common sense when judging the measurement result.
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•
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Check first that there is a voltage supply to the control module and that it is grounded.
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•
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Then check all sensor inputs and signals from other systems.
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Lastly check the outputs of the control module. Remember that the output values do not say anything about the functioning of the related actuator.
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•
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If any measurement value is incorrect, use the wiring diagram to determine which cables, connectors or components should also be checked.
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•
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The given measurement values are as measured with a calibrated Fluke 88/97.
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The measurement values %(+) and ms(+) show respectively the pulse ratio and the pulse length. A test instrument with pulse ratio and pulse width measurement must be used. The plus sign (+) denotes a positive trigger pulse, TRIG+.
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Connector Body 1 to main wiring harness
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Connector section A (in the diagram = B1-A)
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Door control module, RL and RR
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Out
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Ignition on
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1 to B-
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B+
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2
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DVD unit
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Out
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Ignition on
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2 to B-
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B+
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3
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Entry point junction to T-A pin 2
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microswitch, boot lid lock - BCM
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4
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Control module, TPS
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Out
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Ignition on
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4 to B-
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B+
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5
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Not connected
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6
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Not connected
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7
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Not connected
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8
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Entry point junction to H2 pin 3
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interior lighting - BCM
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9
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Entry point junction to H2 pin 4
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interior lighting - BCM
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Connector section B (in the diagram = B1-B)
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Not connected
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2
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Not connected
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3
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Not connected
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4
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AMP2
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Out
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Ignition on
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4 to B-
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B+
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5
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Not connected
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6
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Entry point junction to TR-WH pin 4
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trailer connection - IPRC
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Connector section C (in the diagram = B1-C)
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Entry point junction to H2 pin 1
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interior lighting - BCM
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2
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Electrical heating, RH front seat
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Ignition on/off
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2 to B-
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B+/0V
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3
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Electrical heating, LH front seat
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Ignition on/off
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3 to B-
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B+/0V
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4
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Not connected
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5
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Not connected
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6
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Not connected
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Connector section D (in the diagram = B1-D)
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Not connected
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2
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Not connected
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3
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Not connected
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4
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Entry point junction to T-A pin 6
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4D.
OnStar
CV:
microswitch, load holder - STC
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5
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Rear CD changer
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Ignition on
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5 to B-
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B+
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6
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Not connected
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7
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Not connected
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8
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Not connected
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9
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Not connected
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Connector Body 2 to main wiring harness
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Connector section A (in the diagram = B2-A)
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Not connected
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2
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Not connected
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3
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Not connected
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4
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I-bus
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In
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Ignition on
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4 to B-
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0.3 - 0.5 V. Test lamp should blink
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5
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I-bus
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Out
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Ignition on
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5 to B-
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0.3 - 0.5 V. Test lamp should blink
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6
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Not connected
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7
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Not connected
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8
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Entry point junction to H2 pin 3
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interior lighting
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9
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Entry point junction to H1 pin 15
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anti-theft alarm sensor - BCM
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10
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Not connected
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11
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Not connected
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12
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Not connected
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Connector section B (in the diagram = B2-B)
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Entry point junction to H1 pin 11
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anti-theft alarm sensor - BCM
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2
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Not connected
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3
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Entry point junction to T-B pin 3
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crash signal - ACM
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4
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Not connected
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5
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Not connected
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6
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Entry point junction to T-B pin 1
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microswitch, boot lid handle - BCM
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7
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Not connected
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8
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Not connected
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9
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Not connected
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10
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Not connected
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11
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Not connected
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12
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Not connected
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Connector section D (in the diagram = B2-D)
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Not connected
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2
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Not connected
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3
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Not connected
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4
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Not connected
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5
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Brake light switch
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In
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Brake lights on
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5 to B-
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B+
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6
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Not connected
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7
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Not connected
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8
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Not connected
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9
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Ignition switch module,
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In
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Ignition on/off
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9 to B-
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12 V/0 V
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10
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Entry point junction to R-A pin 7
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locking, fuel filler flap - BCM
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11
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Entry point junction to R-A pin 6
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unlocking, fuel filler flap - BCM
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12
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Entry point junction to R-A pin 5
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anti-theft-alarm siren - BCM
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Connector Body 3 (in the diagram = B3) to main wiring harness
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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+30-supply
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In
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1 to B-
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B+
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2
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+30-supply
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In
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2 to B-
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B+
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3
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+30-supply
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In
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3 to B-
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B+
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4
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Electrically adjustable seats
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Out
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Ignition on
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4 to B-
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B+
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5
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Not connected
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6
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Door control module, RL
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Out
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6 to B-
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B+
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7
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Door control module, RR
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Out
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7 to B-
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B+
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8
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Seats
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Out
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8 to B-
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B+
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9
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Not connected
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Connector Head 1 (in the diagram = H1) to roof wiring harness
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Entry point junction to T-C pin 8
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microphone cable screen (4D)
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2
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Entry point junction to T-C pin 7
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microphone+ (4D)
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3
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Entry point junction to T-C pin 5
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microphone (4D)
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4
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Not connected
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5
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Not connected
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6
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Sunroof module
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Instrument bus
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7
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Interior lightning, sunroof module
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In
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Ignition on
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7 to B-
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B+
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8
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+ 30 power supply, sunroof module
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Out
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Ignition on
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8 to B-
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B+
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9
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Not connected
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10
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+ 30 power supply, anti-theft alarm
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Out
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Ignition on
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10 to B-
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B+
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11
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Entry point junction to B2-B pin 1
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anti-theft alarm sensor - BCM
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12
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Sunroof module
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In
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Ignition on
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12 to B+
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B+
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13
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Not connected
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14
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Not connected
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15
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Entry point junction to B2-A pin 9
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anti-theft alarm sensor - BCM (signal)
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16
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Not connected
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Connector Head 2 (in the diagram = H2) to roof wiring harness
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
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Measure between
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Measurement value
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1
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Entry point junction to B1-C pin 1
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interior lighting
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2
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+15 power supply, rain sensor
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Out
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Ignition on
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2 to B-
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B+
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3
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Entry point junction to B1-A pin 8
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interior lighting
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4
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Entry point junction to B1-A pin 9
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interior lighting
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5
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Not connected
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6
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Not connected
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7
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Not connected
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8
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Not connected
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9
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Ground, rain sensor
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In
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9 to B+
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B+
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10
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+15 power supply ADM
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Out
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Ignition on
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10 to B-
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B+
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11
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Reversing lights
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Ignition on. Reversing lights on.
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11 to B-
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B+
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12
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Not connected
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13
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Not connected
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14
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Not connected
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15
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Elevated brake lights
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Out
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Ignition on. Elevated brake lights activated with Tech 2
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15 to B-
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B+
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16
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Not connected
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17
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Not connected
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18
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Not connected
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19
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Not connected
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20
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Not connected
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21
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Not connected
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22
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Not connected
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23
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Not connected
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24
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Rain sensor
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Rear connector to rear wiring harness
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Connector section A (in the diagram = R-A)
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Pin
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Component/Function
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Component
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In/Out
|
Measurement requirement.
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Measure between
|
Measurement value
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1
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+30-supply
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Out
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1 to B-
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B+
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2
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Luggage compartment lighting (CV)
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3
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Signal ground
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Out
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3 to B+
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B+
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4
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Instrument bus
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5
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Entry point junction to B2-D pin 12
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Anti-theft-alarm siren
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6
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Entry point junction to B2-D pin 11
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fuel filler flap solenoid
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7
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Entry point junction to B2-D pin 10
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fuel filler flap solenoid
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8
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Not connected
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9
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+30 siren
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Out
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9 to B-
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B+
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Connector section B (in the diagram = R-B)
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Pin
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Component/Function
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Component
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In/Out
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Measurement requirement.
|
Measure between
|
Measurement value
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1
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Power ground
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Out
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1 to B+
|
B+
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2
|
Power ground
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Out
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2 to B+
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3
|
Not connected
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Connector section D (in the diagram = R-D)
|
Pin
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Component/Function
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Component
|
In/Out
|
Measurement requirement.
|
Measure between
|
Measurement value
|
|
1
|
Not connected
|
|
|
|
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2
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Brake/tail light LH
|
|
Out
|
Brake light activated or lighting on
|
2 to B-
|
B+
|
|
3
|
Not connected
|
|
|
|
|
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4
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Brake/tail light RH
|
|
Out
|
Brake light activated or lighting on
|
4 to B-
|
B+
|
|
5
|
Not connected
|
|
|
|
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6
|
Direction indicators RH
|
|
|
Direction indicators RH activated/ lighting on
|
6 to B-
|
test lamp blinks
|
|
7
|
Not connected
|
|
|
|
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8
|
Direction indicators LH
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|
|
Direction indicators RH activated/ lighting on
|
8 to B-
|
test lamp blinks
|
|
9
|
Not connected
|
|
|
|
|
|
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10
|
Rear parking light RH
|
|
|
Tail light RH activated with Tech 2
|
10 to B-
|
B+
|
|
11
|
Not connected
|
|
|
|
|
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|
12
|
Rear parking light LH
|
|
|
Tail light LH activated with Tech 2
|
12 to B-
|
B+
|
|
Connector Tail to parcel shelf wiring harness (4D) or rear wiring harness (CV)
|
Connector section A (in the diagram = T-A)
|
Pin
|
Component/Function
|
Component
|
In/Out
|
Measurement requirement.
|
Measure between
|
Measurement value
|
|
1
|
Not connected
|
|
|
|
|
|
|
2
|
Entry point junction to B1-A pin 3
|
boot lid microswitch
|
|
|
|
|
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3
|
Not connected
|
|
|
|
|
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4
|
Not connected
|
|
|
|
|
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5
|
Not connected
|
|
|
|
|
|
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6
|
Entry point junction to B1-D pin 4
|
4D:
OnStar CU
CV:
microswitch, load holder
|
|
|
|
|
|
7
|
CU/PU
|
|
Out
|
Ignition on
|
7 to B-
|
B+
|
|
8
|
Not connected
|
|
|
|
|
|
|
9
|
Luggage compartment lighting
|
|
Out
|
Ignition on. Luggage compartment lighting on.
|
9 to B-
|
B+
|
Connector section B (in the diagram = T-B)
|
Pin
|
Component/Function
|
Component
|
In/Out
|
Measurement requirement.
|
Measure between
|
Measurement value
|
|
1
|
Entry point junction to B2-B pin 6
|
centrally operated lock, boot lid
|
|
|
|
|
|
2
|
Not connected
|
|
|
|
|
|
|
3
|
Entry point junction to B2-B pin 6
|
crash signal CU
|
|
|
|
|
|
4
|
Not connected
|
|
|
|
|
|
|
5
|
Not connected
|
|
|
|
|
|
|
6
|
Not connected
|
|
|
|
|
|
|
7
|
Rear seat backrest
|
|
Out
|
Backrest RH locked/lowered
|
7 to B-
|
5 V/3.5 V
|
|
8
|
Rear seat backrest LH
|
|
Out
|
Backrest LH locked/lowered
|
8 to B-
|
5 V/3.5 V
|
|
9
|
Not connected
|
|
|
|
|
|
|
10
|
Number plate lighting
|
|
Out
|
Number plate lighting activated or with Tech 2
|
10 to B-
|
B+
|
|
11
|
Reversing light RH
|
|
Out
|
Reverse gear selected. Ignition on.
|
1 to B-
|
B+
|
|
12
|
Not connected
|
|
|
|
|
|
Connector section C (in the diagram = T-C)
|
Pin
|
Component/Function
|
Component
|
In/Out
|
Measurement requirement.
|
Measure between
|
Measurement value
|
|
1
|
Reversing lights LH
|
|
Out
|
Reverse gear selected. Ignition on.
|
1 to B-
|
B+
|
|
2
|
Rear fog lights
|
|
Out
|
Rear fog light activated or with Tech 2
|
2 to B-
|
B+
|
|
3
|
Boot lid lock (unlocking)
|
|
Out
|
Ignition on. Locking/unlocking
|
3 to B-
|
0/0.2 V
|
|
4
|
Not connected
|
|
|
|
|
|
|
5
|
Entry point junction to H1 pin 3
|
microphone+ to CU (4D)
|
|
|
|
|
|
6
|
Boot lid lock (ground)
|
|
In
|
Ignition on
|
6 to B-
|
0.2 V
|
|
7
|
Entry point junction to H1 pin 2
|
microphone to CU (4D)
|
|
|
|
|
|
8
|
Entry point junction to H1 pin 1
|
microphone cable screen (4D)
|
|
|
|
|
|
9
|
Not connected
|
|
|
|
|
|
Connector section D (in the diagram = T-D)
|
Pin
|
Component/Function
|
Component
|
In/Out
|
Measurement requirement.
|
Measure between
|
Measurement value
|
|
1
|
Not connected
|
|
|
|
|
|
|
2
|
Antenna amplifier
|
|
In
|
Ignition on
|
2 to B+
|
B+
|
|
3
|
Power ground
|
|
In
|
|
3 to B+
|
B+
|
