Cruise Control On-Off (Main) Switch Circuit
NOTE:
When cruise control main switch is turned to OFF position, cruise control system will not operate.
- Remove cruise control ECU with connector attached. See Figure. Turn ignition on. Measure voltage (backprobe) between ground and terminal No. 1 (White/Blue wire) of cruise control ECU connector. With cruise control main switch turned to OFF position, battery voltage should exist. With cruise control main switch turned to ON position, voltage should be less than .5 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 TESTS, perform next text under appropriate symptom.
- Turn ignition off. 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 for continuity between terminals No. 3 (White/Blue wire) and No. 4 (White/Black wire) of cruise control switch terminals. See Fig 1. With cruise control switch in OFF position, no continuity should exist. 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 ground, cruise control ECU and cruise control switch. Repair as necessary and retest system. If wiring harness and connectors are okay, replace cruise control ECU and retest system.