Pinpoint Test O: The Hazard Lamp Function Is Inoperative/Always On
Turn Signal and Hazard Lamps
Pinpoint Test O: The Hazard Lamp Function Is Inoperative/Always On
Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information Electrical Diagrams.
Normal Operation
The Body Control Module (BCM) sends a voltage signal to the Front Controls Interface Module (FCIM). The voltage signal is routed to ground when the hazard flasher lamp switch is activated. When the BCM (Body Control Module) detects a request for the hazard lamps, the BCM (Body Control Module) provides on/off voltage to all the turn lamps.
- DTC B1D35:23 (Hazard Switch: Signal Stuck Low)- a continuous and on-demand DTC that sets when the BCM (Body Control Module) 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 (Front Controls Interface Module)
- BCM (Body Control Module)
PINPOINT TEST O : THE HAZARD LAMP FUNCTION IS 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.
O1 CHECK THE RECORDED DTCs FROM THE BCM (Body Control Module) SELF-TEST
- Check the recorded DTCs from the BCM (Body Control Module) self-test.
Is DTC B1D35:23 present?
Yes
GO to O2.
No
GO to O4.
O2 CHECK THE FCIM (Front Controls Interface Module)
- Ignition OFF.
- Disconnect: FCIM (Front Controls Interface Module) C2402.
- 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) self-test.
Is DTC B1D35:23 still present?
Yes
GO to O3.
No
GO to O6.
O3 CHECK THE HAZARD LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: BCM (Body Control Module) C2280F.
- Measure the resistance between the FCIM (Front Controls Interface Module) C2402-1, circuit CLS32 (BN/YE), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to O7.
No
REPAIR circuit CLS32 (BN/YE) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.
O4 BYPASS THE FCIM (Front Controls Interface Module)
- Ignition OFF.
- Disconnect: FCIM (Front Controls Interface Module) C2402.
- Connect and remove a fused jumper wire between the FCIM (Front Controls Interface Module) C2402-1, circuit CLS32 (BN/YE), harness side and ground.
Does the hazard lamp function operate?
Yes
GO to O6.
No
GO to O5.
O5 CHECK THE HAZARD LAMP REQUEST INPUT CIRCUIT FOR AN OPEN
- Disconnect: BCM (Body Control Module) C2280F.
- Measure the resistance between the BCM (Body Control Module) C2280F-4, circuit CLS32 (BN/YE), harness side and the FCIM (Front Controls Interface Module) C2402-1, circuit CLS32 (BN/YE), harness side.
Is the resistance less than 5 ohms?
Yes
GO to O7.
No
REPAIR circuit CLS32 (BN/YE) for an open. TEST the system for normal operation.
O6 CHECK FOR CORRECT FCIM (Front Controls Interface Module) OPERATION
- Disconnect all the FCIM (Front Controls Interface Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the FCIM (Front Controls Interface 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 FCIM (Front Controls Interface 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.
O7 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.