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Test 80A - Door Ajar Lamp Circuit

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see appropriate article in ENGINE PERFORMANCE:
  1. Close all doors. Using scan tool, read left front door ajar status. If scan tool displays LF DOOR AJAR CLOSED, go to TEST 38B  . If scan tool does not display LF DOOR AJAR CLOSED, go to next step.
  2. Using scan tool, read door ajar status. If scan tool displays DOOR AJAR CLOSED, go to TEST 39B  . If scan tool does not display DOOR AJAR CLOSED, go to next step.
  3. Open left front door. Using scan tool, read left front door ajar status. If scan tool displays LF DOOR AJAR OPEN, go to TEST 38A  . If scan tool does not display LF DOOR AJAR OPEN, go to next step.
  4. Using scan tool, read door ajar status. While observing scan tool, open and close all doors except left front door. If scan tool door ajar status does not change each time a door is opened or closed, go to TEST 34A  . If door ajar status changes each time a door is opened or closed, go to next step.
  5. Ensure all doors are closed. If door ajar lamp does not illuminate, go to step 7). If door ajar lamp illuminates, go to next step.
  6. Disconnect Body Control Module (BCM) Gray connector. BCM is located behind right kick panel. If door ajar lamp does not illuminate, replace BCM. If door ajar lamp illuminates, repair short to ground in Pink/Black wire.
  7. Turn ignition on. Disconnect message center connector. Connector is located under left side of dash, near instrument cluster connector. Remove and inspect message center door ajar lamp. If lamp is open, replace lamp. If lamp is okay, go to next step.
  8. Using scan tool in voltmeter mode, check voltage on message center connector terminal No. 4 (Dark Blue/White wire). If voltage is less than 10 volts, repair open Dark Blue/White wire. If voltage is more than 10 volts, go to next step.
  9. Turn ignition off. Disconnect BCM Gray connector. Using scan tool in voltmeter mode, check voltage on message center connector terminal No. 1 (Pink/Black wire). If voltage is more than 0.1 volt, repair short to voltage in Pink/Black wire and replace BCM. If voltage is less than 0.1 volt, go to next step.
  10. Using an external ohmmeter, check resistance of Pink/Black wire between BCM Gray connector terminal No. 9 and message center connector terminal No. 1. If resistance is more than 5 ohms, repair open Pink/Black wire. If resistance is less than 5 ohms, go to next step.
  11. Inspect circuit board behind message center. If circuit board is damaged, replace circuit board. If circuit board is okay, replace BCM.
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