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Key-In Switch Circuit Check

  1. Turn ignition switch to LOCK position. Using a voltmeter, backprobe terminal No. 24 (White/Red wire) at Smart Entrance Control Unit (SECU) harness connector. See Figure . When key is in ignition switch, battery voltage should exist. When key is out of ignition switch, zero volts should exist. If voltage is as specified, key-in switch circuit is okay at this time. If voltage is not as specified, go to next step.
  2. Turn ignition switch to LOCK position. Remove lower steering column cover. Disconnect key-in switch harness connector. Measure resistance between key-in switch terminals (component side). When key is in ignition switch, continuity should exist. When key is out of ignition switch, continuity should not exist. If continuity is not as specified, replace key-in switch. If continuity us as specified, check for the following and repair as necessary:
    • Faulty fuse No. 24 (7.5-amp) in instrument panel fuse box.
    • Open and/or short in Yellow/Blue wire between instrument panel fuse box and key-in switch.
    • Open and/or short in White/Red wire between SECU and key-in switch.
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