The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control set/coast and resume/accelerate 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 set/coast and resume/accelerate switch signal circuit when a switch is applied.

Schematic Reference

Cruise Control Schematics

Connector End View Reference

Electrical Information Reference

1. Ignition ON, observe the scan tool Cruise Control Switch parameter in the BCM while pressing the various cruise control switches. The reading should be Error.

⇒	If the Cruise Control Switch parameter toggles between On, Off, Resume, and Set accordingly with the depressed switches, go to Testing for Intermittent Conditions and Poor Connections .

Caution: Refer to SIR Caution in the Preface section.

Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling .

1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
2. Disconnect the harness connector at the steering wheel controls - left.
3. Ignition ON, measure for B+ at the EPS/STR WHL CNTRL supply voltage circuit.

⇒	If less than the specified value, check for a short to ground or an open/high resistance on the EPS/STR WHL CNTRL supply voltage circuit.

4. Ignition OFF, disconnect the harness connector C2 of the BCM.
5. Install a fused jumper at the harness connector of the steering wheel controls switch - left between the EPS/STR WHL CNTRL supply voltage circuit terminal 4 and the cruise control switch signal circuit terminal 6.
6. Ignition ON, verify that a test lamp illuminates at the harness connector of the BCM C2 between the cruise control switch signal circuit terminal 61 and ground.

⇒	If the test lamp does not illuminate, test the cruise control switch signal circuit for a short to ground or an open/high resistance.

7. Ignition OFF, disconnect the fused jumper.
8. Ignition OFF, verify that the test lamp does not illuminate at the harness connector of the BCM C2 between the cruise control switch signal circuit terminal 61 and ground.

⇒	If the test lamp illuminates, test the cruise control switch signal circuit for a short to voltage.

9. If the circuits test normal, test the component. If the component tests normal, replace the BCM.

Caution: Refer to SIR Caution in the Preface section.

Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling .

1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
2. Ignition OFF, disconnect the harness connector at the steering wheel controls - left.
3. Measure the resistance between terminals 4 and 6 at the cruise control switch side of the connector. Individually activate and hold each cruise control function switch and compare the resistance reading to the values for the On, Off, - SET and the + RES switches.

⇒	If any of the resistance measurements for the On, Off, - SET, and the + RES switches are not within the listed resistance values, replace the steering wheel controls - left.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.