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Test 5A - Mic OTIS Illumination

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, read body controller module fault codes. If a panel light failure fault is present, go to TEST 5C  .
  2. If a panel light failure fault is NOT present, turn ignition off. Disconnect Mechanical Instrument Cluster (MIC) Gray connector. Turn parking lights on. With DRB-II in voltmeter mode, check voltage on MIC Gray connector panel lights feed circuit (Orange wire) while moving dimmer control switch/lever from high to low. If voltage changes from zero to 12 volts, go to TEST 5B  .
    NOTE: The BCM and headlight switch must be connected in steps 3) and 4). Failure to do so may lead to incorrect circuit/system diagnosis.
  3. If voltage did not change from zero to 12 volts, access Body Controller Module (BCM). Module is located behind right kick panel. With DRB-II in voltmeter mode, backprobe BCM Gray connector terminal No. 8, panel lights feed circuit (Orange wire) while moving dimmer control switch/lever from high to low. If voltage changes from zero to 12 volts, repair open circuit in Orange wire between BCM and MIC. Perform VERIFICATION PROCEDURE VER-1.
  4. If voltage did not change from zero to 12 volts, access headlight switch connector. With DRB-II in voltmeter mode, backprobe headlight switch 8-pin connector panel lights circuit (Orange wire). If voltage is more than 10 volts, repair open circuit in Orange wire between headlight switch and BCM. Perform VERIFICATION PROCEDURE VER-1.
  5. If voltage is less than 10 volts, use DRB-II in voltmeter mode to check voltage on headlight switch 7-pin connector fused battery feed circuit (Red/White wire). If voltage is more than 10 volts, replace headlight switch. Perform VERIFICATION PROCEDURE VER-1. If voltage is less than 10 volts, repair open circuit in Red/White wire. Perform VERIFICATION PROCEDURE VER-1.
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