Pinpoint Test G: The AUTOLAMPS Are Inoperative
WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
- G1 USE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE SJB SELF-TEST
- 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 OPERATION
- Place the headlamp switch in the HEADLAMPS ON position.
- Do the headlamps operate correctly?
Yes : GO to G3.
No : REFER to HEADLAMPS to continue diagnosis of the headlamps.
- 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 VLF14 (BU/BN), harness side and ground.
- Is the voltage approximately 5 volts?
Yes : INSTALL a new light sensor. REFER to LIGHT SENSOR . CLEAR the DTCs. REPEAT the self-test.
No : GO to G4.
- G4 CHECK CIRCUIT VLF14 (BU/BN) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB 2280d.
- Measure the resistance between the light sensor C286-2, circuit VLF14 (BU/BN), 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 MULTIFUNCTION ELECTRONIC CONTROL MODULES . 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.