Pinpoint Test P: The Hazard Lamps Are Inoperative/Always On
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test P: The Hazard Lamps Are Inoperative/Always On
Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends a voltage reference signal to the hazard lamp switch through circuit CLS32 (BN/YE). When the hazard switch is engaged, the voltage signal is routed to ground through circuit GD116 (BK/VT). When the SJB detects a request for the hazard lamps, the SJB provides on/off voltage to the all the turn lamps.
- DTC B1875 (Turn Signal/Hazard Switch Signal Circuit Failure) - an on-demand DTC that sets when the SJB detects a short to ground from the hazard lamp switch input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Hazard lamp switch
- SJB
PINPOINT TEST P: THE HAZARD LAMPS ARE INOPERATIVE/ALWAYS ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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P1 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Ignition OFF.
- Retrieve the recorded results from the SJB self-test.
- Is DTC B1875 present?
Yes
GO to P2.
No
GO to P4.
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P2 CHECK THE HAZARD FLASHER LAMP SWITCH (DTC B1875)
- Disconnect: Hazard Flasher Lamp Switch C2355.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Clear the DTCs and repeat the SJB on-demand self-test.
- Is DTC B1875 still present?
Yes
GO to P3.
No
INSTALL a new hazard flasher lamp switch. REFER to Hazard Flasher Lamp Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
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P3 CHECK CIRCUIT CLS32 (BN/YE) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280d .
- Measure the resistance between the SJB C2280d-20, circuit CLS32 (BN/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to P7.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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P4 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: Hazard Flasher Lamp Switch C2355.
- Measure the resistance between the hazard flasher lamp switch C2355-1, circuit GD116 (BK/VT), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to P5.
No
REPAIR the circuit. TEST the system for normal operation.
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P5 CHECK CIRCUIT CLS32 (BN/YE) FOR AN OPEN
- Disconnect: SJB C2280d.
- Measure the resistance between the hazard flasher lamp switch C2355-5, circuit CLS32 (BN/YE), harness side and the SJB C2280d-20, circuit CLS32 (BN/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to P6.
No
REPAIR the circuit. TEST the system for normal operation.
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P6 CHECK THE HAZARD FLASHER LAMP SWITCH
- Connect: SJB C2355.
- While holding the hazard flasher lamp switch pressed, measure the resistance between the SJB C2280d-20, circuit CLS32 (BN/YE), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to P7.
No
INSTALL a new hazard flasher lamp switch. REFER to Hazard Flasher Lamp Switch Service and Repair. TEST the system for normal operation.
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P7 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.
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