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Home >> Toyota >> 2001 >> Avalon XLS >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Body Control Systems) >> Symptom Tests >> Power Door Lock Control System >> Faulty Driver's Door 2-Step Unlock Function
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Faulty Driver's Door 2-Step Unlock Function

WARNING: This page is about a different car, the 2000 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

  1. Testing Key Unlock Warning Switch & Circuit

    Disconnect key unlock warning switch connector. See Figure. Using DVOM, check for continuity between switch connector terminal No. 1 (White/Black wire) and No. 2 (Red/Yellow wire). With key in ignition, continuity should be indicated. With key removed from ignition, continuity should not be indicated. If continuity is as specified, go to next step. If continuity is not as specified, replace key unlock warning switch.
  2. Disconnect body control ECU 25-pin connector B4. Check continuity in Red/Yellow wire between key unlock warning switch harness connector terminal No. 2 and body control ECU 25-pin connector B4, terminal No. 17. If continuity is not indicated, repair open in Red/Yellow wire as necessary and retest system. If continuity is indicated, go to next step.

  3. Testing Body Control ECU

    Check all voltage inputs to body control ECU. See BODY CONTROL ECU  under PIN VOLTAGE TESTS. If any voltage inputs are not as specified, repair affected circuit and retest system. See WIRING DIAGRAMS . If all voltage inputs are as specified, substitute known-good body control ECU and retest system. If system now works properly, replace body control ECU. If system still does not work, recheck all related system wiring and connections.
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