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Cruise Control Ecu Back-Up Power Source Circuit

  1. Locate ECU-B fuse in engine compartment junction block No. 2. See Figure. Remove ECU-B 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. 1 (White/Red wire) and ECU-B fuse.
  2. Remove cruise control ECU with connector connected. See Figure. Backprobing connector, measure voltage between ground and cruise control ECU connector terminal No. 1 (White/Red 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. Check wiring harness and connectors between cruise control ECU and battery. Repair as necessary.
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