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Theory of Operation The scan tool will display the door state NOT the switch state. It will display as True/False. True states that the door Possible Causes LEFT REAR DOOR AJAR SWITCH GROUND CIRCUIT OPEN (G77) LEFT REAR DOOR AJAR SWITCH SENSE CIRCUIT OPEN DOOR LOCK MOTOR/AJAR SWITCH BODY CONTROL MODULE Diagnostic Test 1. OPEN LEFT REAR DOOR AJAR SWITCH GROUND CIRCUIT Disconnect the Left Rear Door Lock Motor/Ajar switch connector. Using a 12-volt Test Light connected to 12-volts, test the Ground circuit. Does the test light illuminate brightly? Yes >> Go To 2 No >> Repair the Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - CONTROL MODULES - STANDARD PROCEDURE) 2. CHECK FOR OPEN LEFT FRONT DOOR AJAR SWITCH With the scan tool in Data Display, read the LEFT REAR DOOR AJAR Connect a jumper wire between the Sense circuit and the Ground cir- Does the scan tool display LEFT REAR DOOR AJAR SW: Yes >> Replace the Door Lock Motor/Ajar Switch. Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - CONTROL MODULES - STANDARD PROCEDURE) No >> Go To 3 8L - 142 LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS KJ |