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

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

A1 CHECK FOR RECORDED SJB DTCs FROM THE ON-DEMAND SELF-TEST
- Use the recorded results from the SJB on-demand self-test.
- Is DTC B2A32 or B2A33 recorded?
1. YES : Go to A3.
2. NO : Go to A2.
A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
- Monitor the SJB PID (DIM_SW_3) while rotating the instrument panel dimmer switch from the lowest setting to the highest setting.
- Does the PID indicate the switch is operating correctly?
1. YES : Go to A4.
2. NO : INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch . CLEAR the DTCs. REPEAT the self-test.
A3 CHECK CIRCUIT VLN04 (VT/GY) FOR AN OPEN
- Key in OFF position.
- Disconnect: SJB C2280b
  NOTE: If the jumper wire fails, repair circuit VLN04 (VT/GY) for a short to ground.
- Connect a fused (5A) jumper wire between the SJB C2280b-39, circuit VLN04 (VT/GY) and battery positive.
- Do(es) the backlighting component(s) illuminate?
1. YES : REMOVE the jumper wire. Go to A4.
2. NO : REMOVE the jumper wire. VERIFY the SJB fuse 10 (15A) is OK. REPAIR the circuit. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
A4 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. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.