Pinpoint Test A: The Control Illumination Is Inoperative - All Hardwired DIMMABLE Illumination

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
- Monitor the SJB dimmer switch status (DSWSTAT) PID while rotating the instrument panel dimmer switch from the lowest setting to the highest setting.
- Does the DSWSTAT PID indicate the switch is operating correctly?
1. YES : Go to A2.
2. NO : INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch . TEST the system for normal operation.
A2 CHECK CIRCUIT VLN04 (VT/GY) FOR AN OPEN
- Key in OFF position.
- Disconnect: SJB C2280d
- Connect a fused jumper wire between the SJB C2280d-2, circuit VLN04 (VT/GY), harness side and battery positive.
- Observe the dimmable illumination sources.
- Do the dimmable illumination sources illuminate?
1. YES : Go to A3.
2. NO : REPAIR the circuit. TEST the system for normal operation.
A3 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?
1. YES : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.