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Home >> Lexus >> 2000 >> LX 470 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Anti-Theft Systems >> System Tests >> Test No. 8

Test No. 8

  1. Check Key Unlock Warning Switch

    Disconnect harness connector for key unlock warning switch. Key unlock warning switch is located near ignition switch and contains a 2-pin harness connector. See Figure.
  2. Connect an ohmmeter between electrical terminals on key unlock warning switch. Check that no continuity exists with ignition key removed from ignition lock cylinder. Check that continuity exists with ignition key installed in ignition lock cylinder.
  3. If key unlock warning switch operates properly, go to next step. If key unlock warning switch is defective, replace key unlock warning switch.

  4. Check Key Unlock Warning Switch Wiring

    Check for defective harness connectors and Red/Black wire between terminal No. 1 at key unlock warning switch, wire color changes to Sky Blue and runs to terminal No. 10 at instrument panel 20-pin harness connector. Also check White/Black wire between terminal No. 2 at key unlock switch harness connector and ground location under driver's seat.WIRING DIAGRAMS . Anti-theft system ECU is located behind glove box and uses a 12-pin and a 22-pin harness connector. See Figure. If harness connectors and wiring are okay, go to next step. If harness connectors or wiring is damaged, repair as necessary.

  5. Replace Anti-Theft System ECU

    Replace anti-theft system ECU. See ANTI-THEFT SYSTEM ECU  under REMOVAL & INSTALLATION. Check system operation. If anti-theft system still cannot be set, go to next test listed. See TROUBLE SHOOTING SYMPTOMS  under TROUBLE SHOOTING.
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