Pinpoint Test C: All DIMMABLE Switch Illumination Is Inoperative

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1 CHECK FOR RECORDED SJB DTCs FROM THE ON-DEMAND SELF-TEST
- Use the recorded results from the SJB self-test.
- Is DTC B2A32 present?
- Yes: GO to C2 .
- No: VERIFY the SJB fuse 10 (15) is OK. If OK, GO to C2 .
  If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. After the repair:
  
  If no DTCs are present, TEST the system for normal operation.
C2 BYPASS THE SJB
NOTE: If the jumper wire fails, refer to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short.
- Ignition OFF.
- Disconnect: SJB C2280b.
- Connect a fused jumper wire between the SJB C2280b-39, circuit VLN04 (VT/GY) and battery positive.
  
  Fig 1: Checking Circuit VLN04 For An Open
  Courtesy of FORD MOTOR CO.
- Do the backlighting components illuminate?
- Yes: REMOVE the jumper wire. GO to C3 .
- No: REMOVE the jumper wire. REPAIR circuit VLN04 (VT/GY) for an open. CLEAR the DTCs. REPEAT the self-test.
C3 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - damaged pins
  - 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 all DTCs. REPEAT the self-test.