Pinpoint Test A: The Low Beams 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.

A1 CHECK CIRCUIT SBB19 (BU/RD) FOR AN OPEN
- Key in OFF position.
- Disconnect: SJB C2280s.
- Measure the voltage between the SJB C2280a-4, circuit SBB19 (BU/RD), harness side and ground.
  
  Fig 1: Checking Circuit SBB19 (BU/RD) For Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to A2.

No : VERIFY the BJB fuse 19 (40A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
A2 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.