Pinpoint Test I: All The Stoplamps Are Inoperative
Stoplamps
Pinpoint Tests
Pinpoint Test I: All The Stoplamps Are Inoperative
Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The stoplamp switch is supplied voltage from the Smart Junction Box (SJB) or the Battery Junction Box (BJB). When the brake pedal is applied, the stoplamp switch routes voltage to the Body Control Module B (BCM-B) indicating a request to turn the high mounted stoplamp and rear stoplamps on.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Stoplamp switch
- SJB
- BCM-B
PINPOINT TEST I: ALL THE 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.
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I1 CHECK FOR VOLTAGE TO THE STOPLAMP SWITCH
- Ignition OFF.
- Disconnect: Stoplamp Switch C2314.
- Measure the voltage between the stoplamp switch C2314-1, circuit SBP02 (YE/RD) or circuit SBB24 (VT/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to I3.
No
For circuit SBP02 (YE/RD), VERIFY the SJB fuse 2 (15A) is OK. If OK, GO to I2. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short Diagrams By Number.
For circuit SBB24 (VT/RD), VERIFY the BJB fuse 24 (10A) is OK. If OK, REPAIR circuit SBB24 (VT/RD) for an open. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short Diagrams By Number.
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I2 CHECK THE STOPLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280d.
- Measure the resistance between the stoplamp switch C2314-1, circuit SBP02 (YE/RD), harness side and the SJB C2280d-13, circuit SBP02 (YE/RD), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to I6.
No
REPAIR circuit SBP02 (YE/RD) for an open. TEST the system for normal operation.
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I3 BYPASS THE STOPLAMP SWITCH
- Connect a fused jumper wire between the stoplamp switch C2314-1, circuit SBP02 (YE/RD) or circuit SBB24 (VT/RD), harness side and the stoplamp switch C2314-2, circuit CCB08 (VT/WH), harness side.
- Are the stoplamps illuminated?
Yes
REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to Stoplamp Switch Service and Repair. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to I4.
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I4 CHECK FOR VOLTAGE TO THE BCM-B
- Connect: Stoplamp Switch C2314.
- Disconnect: BCM-B C4368a.
- While applying the brake pedal, measure the voltage between the BCM-B C4368a-19, circuit CCB08 (VT/WH), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to I5.
No
REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.
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I5 CHECK FOR CORRECT BCM-B OPERATION
- Disconnect all the BCM-B connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM-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. REFER to Body Control Systems. 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.
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I6 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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. REFER to Body Control Systems. 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.
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