Pinpoint Test R: The Parking, Rear Or License Plate Lamps Are On Continuously
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
- R1 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB self-test.
- Is DTC B1578 present?
- 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 Removal and Installation . CLEAR the DTCs. REPEAT the self-test.
- No: GO to R3.
- 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.
- 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.
- 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 INSTALLATION . 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.