Pinpoint Test R: The Parking, Rear Or License Plate Lamps Are On Continuously
Parking, Rear and License Plate Lamps
Pinpoint Tests
Pinpoint Test R: The Parking, Rear Or License Plate Lamps Are On Continuously
Refer to Wiring Diagram Set 92 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Parking, Rear and License Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) monitors the parking lamp request input from the headlamp switch. The SJB provides a ground for the parking lamp relay coil (integrated into the SJB) when a request for the parking lamps is received. When the parking lamp relay is energized, voltage is routed to the front and rear parking lamps.
- DTC B1578 (Lamp Park Input Circuit Short to Ground) - an on-demand DTC that may set when the SJB detects a short to ground from the parking lamps on input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Headlamp switch
- SJB
PINPOINT TEST R: THE PARKING, REAR OR LICENSE PLATE LAMPS ARE ON CONTINUOUSLY
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R1 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB self-test.
- Is DTC B1578 present?
Yes
GO to R2.
No
GO to R4.
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R2 CHECK FOR A VOLTAGE SIGNAL TO THE HEADLAMP SWITCH
- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Measure the voltage between the headlamp switch C205-2, circuit CLS34 (GY), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
No
GO to R3.
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R3 CHECK CIRCUIT CLS34 (YE/OG) FOR A SHORT TO GROUND
- Disconnect: SJB C2280b.
- Measure the resistance between the headlamp switch C205-2, circuit CLS34 (GY), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to R5.
No
REPAIR circuit CLS34 (GY) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
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R4 CHECK THE SJB PARKING LAMPS OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280e.
- Ignition ON.
- Do the parking lamps continue to illuminate?
Yes
REPAIR circuit CLS30 (VT/WH) for a short to voltage. TEST the system for normal operation.
No
GO to R5.
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R5 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. CLEAR the DTCs. REPEAT the self-test.
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