The cruise control switch is an input to the body control module (BCM). The BCM monitors 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

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 and Set as the applicable switch is pressed.

1. Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal 8 and ground.

⇒	If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground.

⇒	If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminal 3.

⇒	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 BCM.

5. Ignition OFF, disconnect the X2 harness connector at the BCM.
6. Test for infinite resistance between the signal circuit terminal 61 and ground.

⇒	If less than the specified value, test the signal circuit for a short to ground.

7. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminal 5.

⇒	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 BCM.

8. Ignition OFF, disconnect the X2 harness connector at the BCM.
9. Test for infinite resistance between the signal circuit terminal 6 and ground.

⇒	If less than the specified value, test the signal circuit for a short to ground.

10. If all circuits test normal, test or replace the steering wheel control switch-left.

Important: The cruise control switch must be ON in order to properly measure the resistance of the - SET, + RES switches.

1. Disconnect the harness connector at the steering wheel controls switch - left.
2. Connect a DMM between terminals 1 and 3 or (1 and 5, cancel switch) of the steering wheel control switch-left.
3. Cruise control switch ON, measure the resistance while individually activation and holding each cruise control function switches and compare the resistance reading to the values in the table for the appropriate switch.

⇒	If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the steering wheel controls - left.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.