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Cruise Control Switch Circuit

  1. Perform SET/COAST , RES/ACC , and CANCEL SWITCHES  tests under CRUISE CONTROL FUNCTION TEST under TROUBLE SHOOTING. If SET/COAST, RES/ACC or CANCEL input signals are not as specified, go to next step. If input signals are as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM TESTS, perform next test listed, go to next step. If input signals are as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM TESTS, perform next test listed.
  2. Remove cruise control ECU with connector attached. See Figure. Turn ignition switch to ON position. Backprobing connector, measure voltage between cruise control ECU connector terminal No. 10 (Green/Yellow wire) and ground with switch in specified positions. See CRUISE CONTROL ECU VOLTAGE SPECIFICATIONS  table. 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 test listed.
    CRUISE CONTROL ECU VOLTAGE SPECIFICATIONS

    Switch Position Volts
    Off 10-16
    RES/ACC 0.6-2.3
    SET/COAST 1.9-4.7
    CANCEL 3.4-7.2
  3. Turn ignition switch to OFF position. Disable air bag system. See AIR BAG RESTRAINT SYSTEMS article. Remove steering wheel center pad (air bag module) and disconnect CRUISE control switch 6-pin connector. Measure resistance between cruise control switch connector terminals No. 4 (White/Black wire) and No. 5 (Green/Yellow wire) with switch in specified positions. See CRUISE CONTROL SWITCH RESISTANCES  table. If resistance is as specified, go to next step. If resistance is not as specified, replace cruise control switch and retest system.
    CRUISE CONTROL SWITCH RESISTANCES

    Switch Position Ohms
    Off Infinity
    RES/ACC 50-80
    SET/COAST 180-220
    CANCEL 400-440
  4. Check for continuity between cruise control switch terminals No. 4 (White/Black wire) and No. 5 (Green/Yellow wire). 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.
  5. 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, go to next step.
  6. Repeat step  1. If SET/COAST, RES/ACC or CANCEL input signals are still not as specified, replace cruise control ECU and retest system. If input signals are as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM TESTS, perform next test listed.
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