Pinpoint Test M: The Hazard Lamps Are Inoperative/Always On
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test M: 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 flasher lamp switch through circuit 1689 (RD/WH). When the hazard flasher lamp switch is pressed, the signal is routed to ground through circuit 1205 (BK).
- DTC B2071 (Hazard Switch Signal Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground from the hazard flasher lamp switch input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Hazard flasher lamp switch
- SJB
PINPOINT TEST M: 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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M1 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Ignition OFF.
- Retrieve the recorded results from the SJB self-test.
- Was DTC B2071 present?
Yes
GO to M2.
No
GO to M4.
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M2 CHECK THE HAZARD FLASHER LAMP SWITCH (DTC B2071)
- Disconnect: Hazard Flasher Lamp Switch C2039.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Repeat the SJB on-demand self-test.
- Is DTC B2071 present?
Yes
GO to M3.
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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M3 CHECK CIRCUIT 1689 (RD/WH) FOR SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280b.
- Measure the resistance between the hazard flasher lamp switch C2039-5, circuit 1689 (RD/WH), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to M7.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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M4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Disconnect: Hazard Flasher Lamp Switch C2039.
- Measure the resistance between the hazard flasher lamp switch C2039-1, circuit 1205 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to M5.
No
REPAIR the circuit. TEST the system for normal operation.
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M5 CHECK CIRCUIT 1689 (RD/WH) FOR AN OPEN
- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-24, circuit 1689 (RD/WH), harness side and the hazard flasher lamp switch C2039-5, circuit 1689 (RD/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to M6.
No
REPAIR the circuit. TEST the system for normal operation.
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M6 CHECK THE HAZARD FLASHER LAMP SWITCH
- Connect: Hazard Flasher Lamp Switch C2039.
- While pressing and releasing the hazard flasher lamp switch, measure the resistance between the SJB C2280b-24, circuit 1689 (RD/WH), harness side and ground.
- Is the resistance less than 5 ohms with the hazard flasher lamp switch pressed and greater than 10,000 ohms with the hazard flasher lamp switch released?
Yes
GO to M7.
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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M7 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. 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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