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Home >> Mercedes Benz >> 2025 >> eSprinter Base, _NA_ >> Repair and Diagnosis >> External Pages >> Different car >> Section 2829 (Instrument Cluster Illumination And Panel Illumination -- F250-F550 Super Duty) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test D: All Dimmable Switch Illumination Is Always On >> Pinpoint Test D: All DIMMABLE Switch Illumination Is Always On

Pinpoint Test D: All DIMMABLE Switch Illumination Is Always On

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.
  1. D1 CHECK THE EXTERIOR LIGHTING 
    • Ignition OFF.
    • Place the headlamp switch in the OFF position.
    • Observe the exterior lighting components.
    • Are any exterior lighting components illuminated? 
  2. D2 CHECK THE SJB BACKLIGHTING OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB  C2280b.
    • Ignition ON.
    • Do the dimmable backlighted components continue to illuminate? 
    • Yes:  REPAIR circuit VLN04 (VT/GY) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to D3  .
  3. D3 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 the DTCs. REPEAT the self-test.
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