Pinpoint Test
- CHECK THE STOPLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Stoplamp Switch.
- Measure:
Stoplamp Switch Ground C278 Ground Pin Circuit Measurement / Action Pin Circuit 1 SBB59 (BU/RD) - Ground
Is the voltage greater than 11 volts?
- Yes: GO to 2 .
- No: VERIFY the BJB fuse 59 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the cause for the circuit short.
- BYPASS THE STOPLAMP SWITCH
- Connect a fused jumper wire:
Stoplamp Switch Stoplamp Switch C278 C278 Pin Circuit Measurement / Action Pin Circuit 1 SBB59 (BU/RD) 4 CCB08 (VT/WH)
Do the stoplamps illuminate?
- Yes: REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to Stoplamp Switch .
- No: LEAVE the jumper wire connected. GO to 3 .
- Connect a fused jumper wire:
- CHECK THE STOPLAMP SWITCH INPUT CIRUCIT TO THE BCM FOR AN OPEN
- Disconnect: BCM C2280B.
- Measure:
BCM Ground C2280B Ground Pin Circuit Measurement / Action Pin Circuit 28 CCB08 (VT/WH) - Ground
Is the voltage greater than 11 volts?
- Yes: REMOVE the jumper wire. VERIFY the BCM fuse 15 (15A) is OK. If OK, GO to 4
.
If not OK, REFER to the appropriate OEM WIRING DIAGRAMS to identify the cause for the circuit short.
- No: REMOVE the jumper wire. REPAIR the circuit.
- BYPASS THE BCMNOTE: If the jumper wire fails, REFER to the appropriate OEM WIRING DIAGRAMS to identify the cause for the circuit short. After the repair:
If DTC U1000:00 is present, clear the DTCs and repeat the on-demand self-test (required to enable the stoplamp output driver if DTC U1000:00 is present).
If DTC U3000:49 is present, INSTALL a new BCM. REFER to BODY CONTROL MODULE (BCM) - WITHOUT INTELLIGENT ACCESS (IA) , or REFER to BODY CONTROL MODULE (BCM) - WITH INTELLIGENT ACCESS (IA) .- Disconnect: BCM C2280D.
- Connect a fused jumper wire:
BCM Battery Positive C2280D Positive Pin Circuit Measurement / Action Pin Circuit 14 CLS52 (BN) - Positive
Do the stoplamps illuminate?
- Yes: REMOVE the jumper wire. GO to 5 .
- No: REMOVE the jumper wire. REPAIR the BCM stoplamp output circuit for an open.
- 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 BODY CONTROL MODULE (BCM) - WITHOUT INTELLIGENT ACCESS (IA) , or REFER to BODY CONTROL MODULE (BCM) - WITH INTELLIGENT ACCESS (IA) .
- 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.