Pinpoint Test P: The Hazard Lamps Are Inoperative/Always On
Turn Signal and Hazard Lamps
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. [1][2]Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends a voltage signal to the hazard flasher lamp switch. When the hazard flasher lamp switch is pressed, the voltage signal is routed to ground. When the SJB (Smart Junction Box) detects a request for the hazard lamps, the SJB (Smart Junction Box) provides voltage to the appropriate turn lamps.
The hazard flasher lamp switch is a momentary contact switch.
The hazard flasher lamp switch for MKZ is integrated into the Front Controls Interface Module (FCIM).
- DTC B2071 (Hazard Switch Signal Short to Ground)- an on-demand DTC that sets when the SJB (Smart Junction Box) 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 (Fusion)
- FCIM (Front Controls Interface Module) (MKZ)
- SJB (Smart Junction Box)
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.
P1 CHECK THE RECORDED DTCs FROM THE SJB (Smart Junction Box) SELF-TEST
- Check the recorded DTCs from the SJB (Smart Junction Box) self-test.
Is DTC B2071 present?
Yes
GO to P2.
No
GO to P4.
P2 CHECK THE HAZARD FLASHER LAMP SWITCH
- Disconnect: Hazard Flasher Lamp Switch C2039 (Fusion).
- Disconnect: FCIM (Front Controls Interface Module) C2402 (MKZ).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB (Smart Junction Box) Self-Test.
- Repeat the SJB (Smart Junction Box) self-test.
Is DTC B2071 still present?
Yes
GO to P3.
No
For Fusion, INSTALL a new hazard flasher lamp switch. REFER to Hazard Flasher Lamp Switch . TEST the system for normal operation.
For MKZ, INSTALL a new FCIM (Front Controls Interface Module). TEST the system for normal operation.
P3 CHECK THE HAZARD LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB (Smart Junction Box) C2280B.
- For Fusion, measure the resistance between the hazard flasher lamp switch C2039-6, circuit CLS32 (BN/YE), harness side and ground.
- For MKZ, measure the resistance between the FCIM (Front Controls Interface Module) C2402-6, circuit CLS32 (BN/YE), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to P7.
No
REPAIR circuit CLS32 (BN/YE) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
P4 CHECK FOR A VOLTAGE SIGNAL TO THE HAZARD FLASHER LAMP SWITCH OR THE FCIM (Front Controls Interface Module)
- Ignition OFF.
- Disconnect: Hazard Flasher Lamp Switch C2039 (Fusion).
- Disconnect: FCIM (Front Controls Interface Module) C2402 (MKZ).
- For Fusion, measure the voltage between the hazard flasher lamp switch C2039-6, circuit CLS32 (BN/YE), harness side and ground.
- For MKZ, measure the voltage between the FCIM (Front Controls Interface Module) C2402-6, circuit CLS32 (BN/YE), harness side and ground.
Is the voltage greater than 10 volts?
Yes
For Fusion, GO to P6.
For MKZ, INSTALL a new FCIM (Front Controls Interface Module). TEST the system for normal operation.
No
GO to P5.
P5 CHECK THE HAZARD LAMP REQUEST INPUT CIRCUIT FOR AN OPEN
- For Fusion, measure the resistance between the SJB (Smart Junction Box) C2280B-48, circuit CLS32 (BN/YE), harness side and the hazard flasher lamp switch C2039-6, circuit CLS32 (BN/YE), harness side.
- For MKZ, measure the resistance between the SJB (Smart Junction Box) C2280B-48, circuit CLS32 (BN/YE), harness side and the FCIM (Front Controls Interface Module) C2402-6, circuit CLS32 (BN/YE), harness side.
Is the resistance less than 5 ohms?
Yes
GO to P7.
No
REPAIR circuit CLS32 (BN/YE) for an open. TEST the system for normal operation.
P6 CHECK FOR VOLTAGE TO THE HAZARD FLASHER LAMP SWITCH USING THE CONNECTOR GROUND
- Measure the voltage between the hazard flasher lamp switch C2039-6, circuit CLS32 (BN/YE), harness side and the hazard lamp switch C2039-2, circuit GD116 (BK/VT), harness side.
Is the voltage greater than 10 volts?
Yes
INSTALL a new hazard flasher lamp switch. REFER to Hazard Flasher Lamp Switch . TEST the system for normal operation.
No
REPAIR circuit GD116 (BK/VT) for an open. TEST the system for normal operation.
P7 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION
- Disconnect all the SJB (Smart Junction Box) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB (Smart Junction Box) 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 (Smart Junction Box). 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.