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.

Perform the following to avoid misdiagnosis:
- Ensure that the following cruise control switches are not stuck in the engaged position:
- On/Off switch
- Set/Coast switch
- Resume/Accel switch
- Inspect for proper operation of the stop lamps.
- 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.
- 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 9-12:

Steps 13-18:

Steps 19-22:

Step 23:

The numbers below refer to the step numbers on the diagnostic table.
9. This step tests the ignition 1 voltage circuit for an open, for a short to ground, or for a high resistance.
22. DTCs will set in the PCM when you perform this diagnostic table.