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

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.