Pinpoint Test V: The Fog Lamps Are On Continuously

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.

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 scan tool: SJB Headlamp Switch PID.
- Monitor the SJB headlamp switch PID.
- Does the PID indicate the fog lamp switch is active?
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.
  
  Fig 1: Measuring Resistance Between Headlamp Switch C205-6, Circuit 1406 (YE/LG), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- 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 COMPONENT TESTING article 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 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.