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Interior Light Operation Check

  1. Turn interior light switch to DOOR position. Open driver's door. If dome light operates, go to next step. If dome light does not operate, repair interior light system as necessary. See appropriate wiring diagram in ILLUMINATION/INTERIOR LIGHTS article.
  2. Ensure all doors are closed and interior light switch is in DOOR position. Using a voltmeter connected to ground, backprobe terminal No. 9 (Red/Black wire) at Smart Entrance Control Unit (SECU) harness connector. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/Black wire between SECU and interior light.
  3. Ensure all doors are closed and interior light switch is in DOOR position. Using a voltmeter connected to ground, backprobe terminal No. 9 (Red/Black wire) at Smart Entrance Control Unit (SECU) harness connector. When unlock button on remote controller is pressed, zero volts should exist for 30 seconds. Before unlock button is pressed and 30 seconds after unlock button is pressed, battery voltage should exist. If voltage is as specified, system is okay at this time. If voltage is not as specified, replace SECU.
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