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Cruise Control Ecu Power Source Circuit

  1. Locate ECU-IG fuse in instrument panel junction block No. 1 on lower left side of instrument panel. See Figure. Remove ECU-IG fuse and ensure fuse continuity. If fuse is okay, go to next step. If fuse is not okay, check for short between cruise control ECU connector terminal No. 4 (Blue/Red wire) and ECU-IG fuse.
  2. Remove the cruise control ECU with connector connected. See Figure. Turn ignition switch to ON position. Using voltmeter, backprobe between cruise control ECU connector terminals No. 4 (Blue/Red wire) and No. 10 (White/Black wire). If battery voltage is not present, go to next step. If battery voltage is present, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM DIAGNOSIS, perform next test listed.
  3. Turn ignition switch to OFF position. Backprobing connector, measure resistance between ground and cruise control ECU connector terminal No. 10 (White/Black wire). If resistance is one ohm or less, check wiring harness and connector between cruise control ECU connector and battery. Repair wiring harness as necessary. If resistance is more than one ohm, repair open White/Black wire in wiring harness.
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