PINPOINT TEST AB : All the Reversing Lamps Are Inoperative
- AB1 CHECK THE STOPLAMP OPERATION
- Ignition OFF.
- Apply the brake pedal while observing the stoplamps.
Do the stoplamps illuminate?
Yes GO to AB2. No Refer to Exterior Lighting , Symptom Chart: Stoplamps. - AB2 CHECK THE BCM OUTPUT
- Ignition ON.
- Using a scan tool, view BCM PIDs.
- Using a scan tool, select the BCM RVRS_LMPS PID. Command the reverse lamps on then off.
Do the reversing lamps illuminate when commanded on?
Yes REFER to Automatic Transmission 6F50/6F55 , Symptom Chart: Automatic Transmission - 6F50 and 6F55 to diagnose a TR concern. No GO to AB3. - AB3 BYPASS THE BCM
- Ignition OFF.
- Disconnect: BCM C2280D.
- Connect a fused jumper wire:
Positive Lead Measurement / Action Negative Lead C2280D-13 Positive Battery Terminal
Do the reversing lamps illuminate?
Yes REMOVE the jumper wire. GO to AB4. No REMOVE the jumper wire. REPAIR the BCM reverse lamp output circuit for an open. - AB4 CHECK FOR CORRECT BCM OPERATION
- Disconnect and inspect all BCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new BCM. REFER to Multifunction Electronic Modules - Without Intelligent Access or REFER to Multifunction Electronic Modules - With Intelligent Access . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
NOTE:
If the fuse in the jumper wire fails, refer to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION
to identify the possible causes of the circuit short.
