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Pinpoint Test J: One Or More Stoplamps Are Inoperative




Stoplamps

Pinpoint Test J: One Or More Stoplamps Are Inoperative

Normal Operation

When the brake pedal is applied, the stoplamp switch routes voltage to the Body Control Module (BCM), indicating the brake pedal is applied.

The BCM (Body Control Module) provides voltage to all the stoplamps (on independent circuits) when it detects the brake pedal is applied.

The LH stoplamps share the fused power source with the LH front turn lamp and the LH exterior mirror turn lamp.

The RH stoplamps share the fused power source with the RH front turn lamp and the RH exterior mirror turn lamp.

The high mounted stoplamp shares the fused power source with the reversing lamps.

The rear stoplamps share a common ground circuit.





This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- Bulb socket

- High mounted stoplamp

- BCM (Body Control Module)

PINPOINT TEST J : ONE OR MORE STOPLAMPS ARE INOPERATIVE

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE:
Make sure the bulb is good before continuing diagnostics.

J1 DETERMINE THE INOPERATIVE STOPLAMP

- Ignition OFF.

- Apply the brake pedal and observe the stoplamps.

Are all the stoplamps inoperative?

Yes
GO to Pinpoint Test I. Pinpoint Test I: All The Stoplamps Are Inoperative
No
For the high mounted stoplamp, GO to J2.

If an individual rear stoplamp is inoperative, GO to J7.

If both LH and RH rear stoplamps are inoperative, REPAIR circuit GD117 (BK) for an open. TEST the system for normal operation.

J2 CHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP

- Disconnect: High Mounted Stoplamp C904.

- While applying the brake pedal, measure the voltage between the high mounted stoplamp C904-3, circuit CLS52 (BN), harness side and ground.






Is the voltage greater than 10 volts?

Yes
GO to J3.
No
VERIFY the BCM (Body Control Module) fuse 15 (15A) is OK. If OK, GO to J4. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short [1][2]Diagrams By Number.

If no DTCs are present, TEST the system for normal operation.

If DTC U1000:00 is present, CLEAR the DTCs and REPEAT the self-test (required to enable the stoplamp output driver if DTC U1000:00 is present). TEST the system for normal operation.

If DTC U3000:49 is present, INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

J3 CHECK THE HIGH MOUNTED STOPLAMP GROUND CIRCUIT FOR AN OPEN

- While applying the brake pedal, measure the voltage between the high mounted stoplamp C904-3, circuit CLS52 (BN), harness side and the high mounted stoplamp C904-1, circuit GD139 (BK/YE), harness side.






Is the voltage greater than 10 volts?

Yes
INSTALL a new high mounted stoplamp. TEST the system for normal operation.
No
REPAIR circuit GD139 (BK/YE) for an open. TEST the system for normal operation.

J4 CARRY OUT THE BCM (Body Control Module) ON-DEMAND SELF-TEST AND RECHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) Self-Test.

- Clear the DTCs and repeat the BCM (Body Control Module) on-demand self-test.

- While applying the brake pedal, measure the voltage between the high mounted stoplamp C904-3, circuit CLS52 (BN), harness side and ground.






Is the voltage greater than 10 volts?

Yes
INSTALL a new high mounted stoplamp. TEST the system for normal operation.
No
GO to J5.

J5 CHECK THE HIGH MOUNTED STOPLAMP OUTPUT CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280D.

- Measure the resistance between the high mounted stoplamp C904-3, circuit CLS52 (BN), harness side and ground.






Is the resistance greater than 10,000 ohms?

Yes
GO to J6.
No
REPAIR circuit CLS52 (BN) for a short to ground. After the repair:

If no DTCs are present, TEST the system for normal operation.

If DTC U1000:00 is present, CLEAR the DTCs and REPEAT the self-test (required to enable the stoplamp output driver if DTC U1000:00 is present). TEST the system for normal operation.

If DTC U3000:49 is present, INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

J6 CHECK THE HIGH MOUNTED STOPLAMP OUTPUT CIRCUIT FOR AN OPEN

- Measure the resistance between the high mounted stoplamp C904-3, circuit CLS52 (BN), harness side and the BCM (Body Control Module) C2280D-14, circuit CLS52 (BN), harness side.






Is the resistance less than 5 ohms?

Yes
GO to J12.
No
REPAIR circuit CLS52 (BN) for an open. TEST the system for normal operation.

J7 CHECK FOR VOLTAGE TO THE REAR STOPLAMP

- Disconnect: Inoperative Rear Lamp.

- While applying the brake pedal, measure the voltage between the inoperative lamp, harness side and ground as follows:

Inoperative Lamp Connector-Pin Circuit LH upper C4112-3 CLS18 (GY/BN) LH lower C4113-3 CLS18 (GY/BN) RH upper C4114-3 CLS19 (VT/OG) RH lower C4115-3 CLS19 (VT/OG)








Is the voltage greater than 10 volts?

Yes
GO to J8.
No
VERIFY the BCM (Body Control Module) fuse 14 (15A) (LH stoplamps) or fuse 13 (15A) (RH stoplamps) is OK. If OK, GO to J9. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short [1][2]Diagrams By Number.

If no DTCs are present, TEST the system for normal operation.

If DTC U1000:00 is present, CLEAR the DTCs and REPEAT the self-test (required to enable the stoplamp output driver if DTC U1000:00 is present). TEST the system for normal operation.

If DTC U3000:49 is present, INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

J8 CHECK THE REAR STOPLAMP GROUND CIRCUIT FOR AN OPEN

- While applying the brake pedal, measure the voltage between the inoperative lamp, harness side and ground as follows:

Inoperative Lamp Connector-Pin Circuit Connector-Pin Circuit LH upper C4112-3 CLS18 (GY/BN) C4112-1 GD117 (BK) LH lower C4113-3 CLS18 (GY/BN) C4113-1 GD117 (BK) RH upper C4114-3 CLS19 (VT/OG) C4114-1 GD117 (BK) RH lower C4115-3 CLS19 (VT/OG) C4115-1 GD117 (BK)








Is the voltage greater than 10 volts?

Yes
INSTALL a new bulb socket. TEST the system for normal operation.
No
REPAIR circuit GD176 (BK/WH) for an open. TEST the system for normal operation.

J9 CARRY OUT THE BCM (Body Control Module) ON-DEMAND SELF-TEST AND RECHECK FOR VOLTAGE TO THE REAR STOPLAMP
NOTE: If both lamps are inoperative on the same side, disconnect one lamp at a time when carrying out this test.

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) Self-Test.

- Clear the DTCs and repeat the BCM (Body Control Module) on-demand self-test.

- While applying the brake pedal, measure the voltage between the inoperative lamp, harness side and ground as follows:

Inoperative Lamp Connector-Pin Circuit LH upper C4112-3 CLS18 (GY/BN) LH lower C4113-3 CLS18 (GY/BN) RH upper C4114-3 CLS19 (VT/OG) RH lower C4115-3 CLS19 (VT/OG)








Is the voltage greater than 10 volts?

Yes
INSTALL a new bulb socket. TEST the system for normal operation.
No
GO to J10.

J10 CHECK THE REAR STOPLAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND
NOTE: It is important to disconnect the corresponding trailer tow stop/turn relay for correct test results.

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280D.

- Disconnect: Corresponding Trailer Tow Stop/Turn Relay.

- Measure the resistance between the BCM (Body Control Module) C2280D-12 (LH stoplamps), circuit CLS18 (GY/BN), harness side and ground; or between the BCM (Body Control Module) C2280D-15 (RH stoplamps), circuit CLS19 (VT/OG), harness side and ground.






Is the resistance greater than 10,000 ohms?

Yes
GO to J11.
No
REPAIR circuit CLS18 (GY/BN) (LH stoplamps) or circuit CLS19 (VT/OG) (RH stoplamps) for a short to ground. After the repair:

If no DTCs are present, TEST the system for normal operation.

If DTC U1000:00 is present, CLEAR the DTCs and REPEAT the self-test (required to enable the stoplamp output driver if DTC U1000:00 is present). TEST the system for normal operation.

If DTC U3000:49 is present, INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

J11 CHECK THE REAR STOPLAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

- Measure the resistance between the inoperative rear lamp, harness side and the BCM (Body Control Module), harness side as follows:

Inoperative Lamp Connector-Pin BCM (Body Control Module) Connector-Pin Circuit LH upper C4112-3 C2280D-12 CLS18 (GY/BN) LH lower C4113-3 C2280D-12 CLS18 (GY/BN) RH upper C4114-3 C2280D-15 CLS19 (VT/OG) RH lower C4115-3 C2280D-15 CLS19 (VT/OG)








Is the resistance less than 5 ohms?

Yes
GO to J12.
No
REPAIR circuit CLS18 (GY/BN) (LH stoplamps) or circuit CLS19 (VT/OG) (RH stoplamps) for an open. TEST the system for normal operation.

J12 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

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

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the BCM (Body Control Module) 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 (Body Control Module). 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.

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