Seat Belt Indicator Circuit Malfunction - Driver
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Seat Belt Indicator Circuit Malfunction - Driver
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Diagnostic Fault Information
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Circuit
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Short to Ground
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High resistance
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Open
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Short to Voltage
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Signal Performance
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Driver Seat Belt Switch Signal
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1
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2
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2
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2
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-
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Driver Seat Belt Switch Low Reference
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-
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2
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2
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2
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-
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1. Indicator will remain ON with seat belt buckled.
2. Indicator will illuminate only for the bulb check.
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Circuit/System Description
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The driver seat belt switch is a 2-wire switch wired to the inflatable restraint sensing and diagnostic module (SDM) using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The SDM sends the status of the driver seat belt via serial data to the instrument panel cluster. After receiving the message, the instrument panel cluster controls the illumination of the driver seat belt indicator.
Schematic Reference
Seat Belt Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Seat Belt System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, with a scan tool turn on all indicators using the Instrument Cluster Output Controls and verify the driver seat belt indicator is illuminated for 5 seconds.
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2.
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If the indicator does not illuminate, replace the P16 instrument panel cluster.
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3.
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With the scan tool monitor the Driver Seat Belt Status parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when buckling and unbuckling the seat belt.
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1.
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Note
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When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
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•
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B88 Seat belt switch
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•
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Seat belt switch harness connector
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•
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K36 SDM
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SDM wiring harness connector
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Ignition OFF, disconnect the harness connector at the B88 seat belt switch.
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2.
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Test for less than 5 Ω between the ground circuit terminal 2 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal replace the K36 SDM.
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4.
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Ignition ON, verify the scan tool Driver Seat Belt Status parameter displays Buckled.
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5.
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If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal replace the K36 SDM.
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6.
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Install a 3 A fused jumper wire between the circuit terminal 1 and the ground circuit terminal 2. Verify the scan tool Driver Seat Belt Status parameter displays Unbuckled.
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7.
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If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the K36 SDM.
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1.
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Ignition OFF, disconnect the harness connector at the B88 seat belt switch.
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2.
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Test for infinite resistance between the signal circuit terminal 1 and the ground terminal 2, at the switch, with the switch in the open position.
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4.
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Test for less than 5 Ω between the signal circuit terminal 1 and the ground terminal 2, at the switch, with the switch in the closed position.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for SDM and instrument panel cluster replacement, setup and programming
