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Test No. 1: Power Source Circuit

  1. Remove and inspect CC ECU-IG fuse. If fuse is okay, go to next step. If fuse is blown, replace fuse and check system operation. If fuse blows again, turn ignition switch to OFF position. Disconnect Cruise Control Electronic Control Unit (CC ECU) connector C17. See Figure. Install new fuse. Turn ignition switch to ON position. Recheck fuse. If fuse is okay, check CC ECU. See PIN VOLTAGE TESTS . If found to be defective, replace CC ECU and recheck system operation. If fuse is blown, locate and repair short in Black/White wire between CC ECU-IG fuse and CC ECU connector C17.
  2. Turn ignition switch to OFF position. Disconnect CC ECU connector C17. See Figure. Check for continuity between ground and CC ECU connector C17 terminal No. 13 (Brown wire). If continuity exists, go to next step. If continuity does not exist, repair faulty ground, or locate and repair open in Brown wire between ground and CC ECU connector C17.
  3. Turn ignition switch to ON position. Measure voltage between ground and CC ECU connector C17 terminal No. 14 (Black/White wire). If battery voltage does not exist, locate and repair open in Black/White wire between ground and CC ECU connector C17. If battery voltage exists, check CC ECU. See PIN VOLTAGE TESTS . If found to be defective, replace CC ECU and recheck system operation.
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