Pinpoint Test V: The Fog Lamps Are On Continuously: Testing
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
- V1 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 B2030 present?
- Yes : GO to V2.
- No : GO to V4.
- V2 CHECK CIRCUIT 1347 (DB/WH) FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280a.
- Key in ON position.
- Do the fog lamps continue to illuminate?
- Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
- No : GO to V3.
- V3 CHECK CIRCUIT 1407 (LB/OG) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Connect: SJB C2280a.
- Disconnect: SJB C2280d.
- Key in ON position.
- Do the fog lamps continue to illuminate?
- Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
- No : GO to V8.
- V4 CHECK THE FOG LAMP SWITCH INPUT
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: SJB Headlamp Switch PID.
- Monitor the SJB headlamp switch PID.
- Does the PID indicate the fog lamp switch is active?
NOTE: Make sure the headlamp switch is in the OFF position.- Yes : GO to V5.
- No : GO to V7.
- V5 CHECK CIRCUIT 1406 (YE/LG) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Headlamp Switch C205.
- Disconnect: SJB C2280d.
- Measure the resistance between the headlamp switch C205-6, circuit 1406 (YE/LG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to V6.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
- V6 CHECK THE HEADLAMP SWITCH
- Carry out the headlamp switch component test. Refer to for component testing.
- Is the headlamp switch OK?
- Yes : GO to V8.
- No : INSTALL a new headlamp switch. CLEAR the DTCs. REPEAT the self-test.
- V7 CHECK CIRCUIT 1776 (TN/OG) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: Fog Lamp Relay C1007.
- Key in ON position.
- Do the fog lamps continue to illuminate?
- Yes : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
- No : INSTALL a new fog lamp relay. CLEAR the DTCs. REPEAT the self-test.
- V8 CHECK FOR CORRECT SJB OPERATION
- Key in OFF position.
- 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 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.