Pinpoint Test A: All DIMMABLE Illumination Is Inoperative

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 SELF-TEST
- Use the recorded results from the SJB self-test.
Are any DTCs recorded?
- Yes : REFER to DTC CHARTS in this article.
- No : GO to A2 .
A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Ignition OFF.
- Disconnect: Instrument Panel Dimmer Switch C2065 .
- Place the headlamp switch in the PARKING LAMPS ON position.
Do the dimmable components illuminate?
- Yes : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH in this article. TEST the system for normal operation.
- No : GO to A3 .
A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
- Place the headlamp switch in the OFF position.
- Disconnect: SJB C2280B .
- Measure the resistance between the instrument panel dimmer switch C2065-6 , circuit CLN27 (WH/BN), harness side and ground.
  
  Fig 1: Measuring Resistance Between Instrument Panel Dimmer Switch C2065-6, Circuit CLN27 (WH/BN) And Ground
  Courtesy of FORD MOTOR CO.
Is the resistance greater than 10, 000 ohms?
- Yes : GO to A4 .
- No : REPAIR circuit CLN27 (WH/BN) for a short to ground. 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?
- Yes : INSTALL a new SJB . REFER to DIAGNOSIS AND TESTING .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. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.