Coupe

Diagnostic Trouble Code (DTC) Chart:

Wiring Schematic:

CIRCUIT DESCRIPTION
The following inputs command the body control module (BCM) to provide a ground path to the courtesy lamps on CKT 156 to S247:
^ The instrument panel (IP) dimmer switch input
^ The right or left side door lock input
^ The right or left door jamb switch input
^ The rear compartment lid ajar indication switch input

S247 distributes the ground to the following components:
^ The dome lamp
^ The courtesy-reading lamps

CONDITIONS FOR SETTING THE DTC
Circuit 156 (courtesy lamps return) is shorted to B+ for greater than 50 milliseconds, while the BCM is attempting to ground the circuit. The BCM grounds circuit 156 if one of the following actions occurs:
^ Either door is opened.
^ The rear compartment lid is opened.
^ The IP dimmer switch is turned on.

ACTION TAKEN WHEN THE DTC SETS
^ DTC 22 will set.
^ There is no courtesy lighting in the vehicle.
^ The IP dimmer switch is inoperative.
^ The IP compartment lamp operates normally.
^ The BCM will read out a series of flash codes upon entering the diagnostic mode.

CONDITIONS FOR CLEARING THE DTC
The fault is corrected and the DTC memory is cleared.

DIAGNOSTIC AIDS
If the only DTC that flashes is a HISTORY code (DTC 32), the problem may be intermittent. Perform the test shown while "Wiggling" the wiring and connectors. This can often cause the fault to appear. Test for poor connections at the BCM connector, which could cause an open or an intermittent fault. Refer to Diagnostic Trouble Code (DTC) Displaying. Entering Diagnostic Mode

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
1. This step tests CKT 156 for a short to B+ with the body control module disconnected.
2. Knowing that there is a short to B+ in CKT 156, this test isolates the short to one side of connector C200.
4. Knowing that the short is in the G200C side of CKT 156, this test isolates the short to either the harness or the rearview mirror.
7. This step tests for a short between CKT 156 and CKT 149.