Pinpoint Test G: The AUTOLAMPS Are Inoperative
WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
- G1 CHECK SMART JUNCTION BOX (SJB) DTCs
- Key in OFF position.
- Using the recorded results from the SJB self-test:
- Was DTC B1793 recorded?
Yes: GO to G3.
No: GO to G2.
- G2 CHECK THE MANUAL HEADLAMP AND PARKING LAMP OPERATION
- Place the headlamp switch in the HEADLAMPS ON position.
- Do the headlamps and parking lamps operate correctly?
Yes: GO to G3.
No: REFER to HEADLAMPS or PARKING, REAR AND LICENSE PLATE LAMPS to continue diagnosis of the headlamps or parking lamps.
- G3 CHECK FOR VOLTAGE TO THE LIGHT SENSOR
- Disconnect: Light Sensor C286.
- Key in ON position.
- Place the headlamp switch in the AUTOLAMPS ON position.
- Measure the voltage between the light sensor C286-2, circuit 1416 (YE/WH), harness side and ground.
- Is the voltage approximately 5 volts?
Yes: INSTALL a new light sensor. CLEAR the DTCs. REPEAT the self-test.
No: GO to G4.
- G4 CHECK CIRCUIT 1416 (YE/WH) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280d.
- Measure the resistance between the light sensor C286-2, circuit 1416 (YE/WH), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes: GO to G5.
No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
- G5 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- 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 REMOVAL AND 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.