Pinpoint Test K: The Stoplamps Are On Continuously

Stoplamps

Pinpoint Test K: The Stoplamps Are On Continuously

Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information [1][2]Diagrams By Number.

When the brake pedal is applied, the stoplamp switch routes voltage to the Smart Junction Box (SJB) , the PCM and Body Control Module B (BCM-B). When the BCM-B (Body Control Module B) detects the brake pedal is applied, the BCM-B (Body Control Module B) provides voltage to the high mounted stoplamp and the LH/RH rear stoplamps.





This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Stoplamp switch

- BCM-B (Body Control Module B)

- SJB (Smart Junction Box)

- PCM

PINPOINT TEST K : THE STOPLAMPS ARE ON CONTINUOUSLY

K1 DETERMINE IF ALL THE STOPLAMPS ARE ILLUMINATED

- Ignition OFF.

- Observe the stoplamps with the brake pedal released.

Are all of the stoplamps illuminated?

Yes
GO to K3.

No
GO to K2.

K2 CHECK THE STOPLAMPS VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE

- Disconnect: BCM-B (Body Control Module B) C4368A.

Do the stoplamps continue to illuminate?

Yes
For the high mounted stoplamp, REPAIR circuit CLS17 (YE/GY) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

For the LH inboard stoplamp, REPAIR circuit CLS18 (GY/BN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

For the LH middle stoplamp, REPAIR circuit CLS50 (BN/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

For the LH outboard stoplamp, REPAIR circuit CLS51 (WH/GN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

For the RH inboard stoplamp, REPAIR circuit CLS19 (VT/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

For the RH middle stoplamp, REPAIR circuit CLS52 (BN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

For the RH outboard stoplamp, REPAIR circuit CLS53 (GY/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.

No
GO to K9.

K3 CHECK THE STOPLAMP SWITCH

- Disconnect: Stoplamp Switch C278.

Do the stoplamps continue to illuminate?

Yes
GO to K4.

No
INSTALL a new stoplamp switch. REFER to Stoplamp Switch . CLEAR the DTCs. REPEAT the self-test.

K4 CHECK THE PCM

- Disconnect: PCM C175B.

Do the stoplamps continue to illuminate?

Yes
GO to K5.

No
GO to K7.

K5 CHECK THE SJB (Smart Junction Box)

- Disconnect: SJB (Smart Junction Box) C2280B.

Does the high mounted stoplamp continue to illuminate?

Yes
GO to K6.

No
GO to K8.

K6 CHECK FOR VOLTAGE ON THE STOPLAMP SWITCH OUTPUT CIRCUIT

- Disconnect: BCM-B (Body Control Module B) C4368A.

- Measure the voltage between the BCM-B (Body Control Module B) C4368A-19, circuit CCB08 (VT/WH), harness side and ground.





Is any voltage present?

Yes
REPAIR circuit CCB08 (VT/WH) for a short to voltage. TEST the system for normal operation.

No
GO to K9.

K7 CHECK FOR CORRECT PCM OPERATION

- Disconnect all the PCM connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the PCM connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new PCM. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

K8 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new SJB (Smart Junction Box). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

K9 CHECK FOR CORRECT BCM-B (Body Control Module B) OPERATION

- Disconnect all the BCM-B (Body Control Module B) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the BCM-B (Body Control Module B) connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new BCM-B (Body Control Module B). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.