Pinpoint Test D: All DIMMABLE Switch Illumination Is Always On

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

D1 CHECK THE EXTERIOR LIGHTING
- Ignition ON.
- Observe the exterior lighting components.
- Are any exterior lighting components illuminated?
- YES: REFER to EXTERIOR LIGHTING SYSTEM article.
- NO: GO to D2 .
D2 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) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
  - NO: GO to D3 .
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 MODULE 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.