Cruise Control - Inoperative/Malfunctioning

CRUISE CONTROL INOPERATIVE/MALFUNCTIONING

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.

DIAGNOSTIC AIDS
Perform the following in order to avoid a misdiagnosis:
- Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the associated cruise control switch parameter in the powertrain control module (PCM) Cruise Control data list. This will help eliminate the possibility of an internally open or shorted inflatable restraint steering wheel module coil.
- Inspect for proper operation of the brake lamps. Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.
- Electromagnetic interference (EMI) on the vehicle speed sensor signal circuit may cause erratic cruise control operation.

For an intermittent condition, refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

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 12-16 volts.

TEST DESCRIPTION

Steps 1 - 9:

Steps 10 - 24:

Steps 25 - 26:

The numbers below refer to the step numbers on the diagnostic table.
7. This step tests the cruise control set/coast switch signal circuit for an open or for a high resistance.
8. This step tests the cruise control resume/accel switch signal circuit for an open or for a high resistance.
9. This step tests the ignition 1 voltage circuit for an open, a short to ground, or a high resistance.
26. DTCs will set in the PCM when you perform this table.