Cruise Control On-Off Switch Circuit
- Remove ECM with connector attached. See Figure. Turn ignition switch to ON position. Measure voltage (backprobe) between ground and Electronic Control Module (ECM) connector terminal No. 22 (Green wire) of ECM 28-pin harness connector E12. See Figure. With cruise control main switch off, battery voltage should exist. With cruise control main switch on, voltage should be less than one volt. If voltage is not as specified, go to next step. If voltage is as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM DIAGNOSIS, perform next test listed.
- Turn ignition switch to OFF position. Disable air bag system. See AIR BAG RESTRAINT SYSTEMS article. Remove steering wheel center pad (air bag module). Disconnect cruise control switch 6-pin connector. Check continuity between terminals No. 4 (White/Black wire) and No. 5 (Green wire) of cruise control switch. No continuity should exist with cruise control switch in OFF position. Continuity should exist with cruise control switch held in ON position. If continuity is as specified, go to next step. If continuity is not as specified, replace cruise control switch and retest system.
- Check wiring harness and connectors between ECM, cruise control switch and ground. Repair as necessary and retest system. If wiring harness and connectors are okay, replace ECM and retest system.