Cruise Control - Inoperative/Malfunctioning

CRUISE CONTROL INOPERATIVE/MALFUNCTIONING

DIAGNOSTIC AIDS

CAUTION: Refer to SIR Caution in Service Precautions.

Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling Zone 3 in Restraint Systems.

In order to avoid misdiagnosis, inspect for the following:
- Proper operation of the brake lamps. Refer to Exterior Lighting Systems Description and Operation in Diagnostic Aids.
- Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the Cruise Control Switch parameter in the BCM Cruise Control data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil.

Electromagnetic interference (EMI) on the speed sensor signal circuit may cause erratic cruise control operation.

For an intermittent condition, refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

CONDITIONS FOR ENABLING CRUISE CONTROl
- The vehicle speed is greater than 40 km/h (25 mph).
- The vehicle is not in PARK, REVERSE, NEUTRAL, or 1st gear.
- The system voltage is within 9-16 volts.
- The park brake is not applied.

TEST DESCRIPTION

Steps 1-4:

Steps 5-8:

Steps 9-13:

The number below refers to the step number on the diagnostic table.
5. This step tests the ignition 1 voltage circuit for an open, for a short to ground, or for a high resistance.