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Cruise Control (Main) Switch Circuit

  1. Remove Engine Control Module (ECM) with connectors connected. See Figure. Turn ignition switch to ON position. Measure voltage by backprobing between ECM E8 connector terminal No. 24 (Yellow/Red wire) and ground. With cruise ON-OFF switch off, battery voltage should exist. With cruise ON-OFF switch on, 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 TESTING, perform next test listed.
  2. 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 for continuity between cruise control switch terminals No. 3 (Brown wire) and No. 5 (Yellow/Red wire). No continuity should exist with cruise ON-OFF switch in OFF position. Continuity should exist with cruise ON-OFF 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.
  3. Check wiring harness and connectors between cruise control ECU, cruise control switch and ground. Repair as necessary and retest system. If wiring harness and connectors are okay, replace ECM and retest system.
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