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

NOTE: 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 self-test.
- Are any DTCs recorded?
- Yes : For DTC B2A32 or DTC B2A33, GO to A5.
- No : GO to A2.
A2 CHECK THE SJB INSTRUMENT PANEL DIMMER SWITCH PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Data Logger.
- Monitor the SJB dimmer switch 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?
- Yes : GO to A4.
- No : GO to A3.
A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Carry out the component test for the instrument panel dimmer switch.
  Refer to SYSTEM WIRING DIAGRAMS for component testing.
- Is the instrument panel dimmer switch OK?
- Yes : GO to A4.
- No : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . TEST the system for normal operation.
A4 CHECK CIRCUIT VLN18 (BU/WH) FOR A SHORT TO GROUND
- Measure the resistance between the instrument panel dimmer switch C2065-6, circuit VLN18 (BU/WH), harness side and ground.
  
  Fig 1: Measuring Resistance Between Instrument Panel Dimmer Switch C2065-6, Circuit VLN18 (BU/WH), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to A6.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
A5 CHECK THE ILLUMINATION OUTPUT CIRCUIT VLN04 (VT/GY)
NOTE: If the fuse in the jumper wire fails, repair circuit VLN04 (VT/GY) for a short to ground.
- Ignition OFF.
- Disconnect: SJB C2280b.
- Connect a fused jumper wire between the SJB C2280b-39, circuit VLN04 (VT/GY) and battery positive.
  
  Fig 2: Connecting Fused Jumper Wire Between SJB C2280B-39, Circuit VLN04 (VT/GY) And Battery Positive
  Courtesy of FORD MOTOR CO.
- Do the backlighting components illuminate?
- Yes : REMOVE the jumper wire. GO to A6.
- 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. If not OK, REFER to the appropriate System Wiring Diagrams to identify the possible causes of the circuit short.
A6 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.