Cruise Control Malfunction
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Cruise Control Malfunction
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open or High Resistance
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Short to Voltage
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Signal Performance
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B+
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1
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1
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1
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-
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Cruise Control Switch Signal
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1
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P0564
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B3794 08, P0567, P0568
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B3794 61, P0564
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1. Cruise Control Malfunction
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Circuit/System Description
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The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control on/off, set/coast, resume/accelerate and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The BCM sends a serial data message to the engine control module (ECM) indicating the status of the cruise control switches.
Schematic Reference
Cruise Control Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Cruise Control 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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Engine ON, while rotating the steering wheel to both steering stops, observe the scan tool Cruise Control Switch parameter while pressing each of the cruise control switches. The parameter should toggle between On, Off, Resume, Set, and Cancel as the applicable switch is pressed.
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1.
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Ignition OFF, disconnect the X1 harness connector at the S70L steering wheel control switch-left.
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2.
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Ignition ON, test for B+ between the B+ circuit terminal 1 and ground.
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3.
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If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
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4.
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Test for B+ between the B+ circuit terminal 1 and the signal circuit terminal 3.
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5.
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If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
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6.
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Ignition OFF, disconnect the X3 harness connector at the K9 BCM.
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7.
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Test for infinite resistance between the signal circuit terminal 9 and ground.
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8.
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If less than the specified value, test the signal circuit for a short to ground.
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9.
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If all circuits test normal, test or replace the S70L steering wheel control switch-left.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
