Diagnostic Aids
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Refer to SIR Caution
in Cautions and Notices.
Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling Zone 3 in SIR.
Perform the following in order 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. Refer to Exterior Lighting Systems Description and Operation in Wiring Systems.
- 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 PCM 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 Conditions and Poor Connections in Wiring Systems.