Pinpoint Test Q: The Hazard Lamps Are Inoperative/Always On
Turn Signal and Hazard Lamps
Pinpoint Test Q: 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 signal to the hazard flasher lamp switch (integrated into the Front Controls Interface Module (FCIM)). The hazard flasher lamp switch is a momentary contact switch. When the hazard flasher lamp switch is pressed, the voltage signal is routed to ground (internal to the FCIM). When the SJB detects a request for the hazard lamps, the SJB provides on/off voltage to all the turn lamps.
- 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
- FCIM
- SJB
PINPOINT TEST Q: 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.
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Q1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded DTCs from the SJB self-test.
- Is DTC B2071 present?
Yes
GO to Q2.
No
GO to Q4.
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Q2 CHECK THE FCIM
- Disconnect: FCIM C2403.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Repeat the SJB self-test.
- Is DTC B2071 still present?
Yes
GO to Q3.
No
GO to Q7.
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Q3 CHECK THE HAZARD FLASHER REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280b.
- Measure the resistance between the FCIM C2403-6, circuit CLS32 (BN/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to Q6.
No
REPAIR circuit CLS32 (BN/YE) for a short to ground. TEST the system for normal operation.
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Q4 CHECK FOR A VOLTAGE REFERENCE SIGNAL TO THE HAZARD FLASHER LAMP SWITCH
- Ignition OFF.
- Disconnect: FCIM C2403.
- Measure the voltage between the FCIM C2403-6, circuit CLS32 (BN/YE), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to Q7.
No
GO to Q5.
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Q5 CHECK THE HAZARD FLASHER REQUEST INPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-48, circuit CLS32 (BN/YE), harness side and the FCIM C2403-6, circuit CLS32 (BN/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to Q6.
No
REPAIR circuit CLS32 (BN/YE) for an open. TEST the system for normal operation.
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Q6 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 Multifunction Electronic Modules Smart Junction Box (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.
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Q7 CHECK FOR CORRECT FCIM OPERATION
- Disconnect all the FCIM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the FCIM 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 FCIM. REFER to Information and Entertainment Systems Front Controls Interface Module (FCIM). 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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