Pinpoint Test C: All DIMMABLE Switch Illumination Is Always On

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. 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 THE EXTERIOR LIGHTING
- Ignition ON.
- Observe the exterior lighting components.
- Are any exterior lighting components illuminated?
- Yes : REFER to EXTERIOR LIGHTING -- FUSION, MILAN & MKZ article.
- No : GO to C2.
C2 CHECK THE SJB BACKLIGHTING OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280b.
- Ignition ON.
- Do the dimmable backlighted components continue to illuminate?
- Yes : REPAIR circuit VLN04 (VT/GY) (Fusion/Milan) or circuit VLN37 (BU/WH) (MKZ) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
- No : GO to C3.
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 -- FUSION, MILAN & MKZ article. 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.