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Pinpoint Test C: The Courtesy Lamps Are Inoperative - Using The Dimmer Switch

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. C1 RETRIEVE THE SJB DTCs FROM BOTH THE CONTINUOUS AND THE ON-DEMAND SELF-TESTS 
    • Check the recorded results from the SJB self-test.
    • Are any DTCs present? 
    1. YES  : REFER to MULTIFUNCTION ELECTRONIC MODULES .
    2. NO  : Go to  C2.
  2. C2 CHECK THE DIMMER SWITCH 
    • Key in OFF position.
    • Disconnect: Dimmer Switch C2298
    • Carry out the dimmer switch component test. Refer to COMPONENT TESTING.
    • Is the dimmer switch OK? 
    1. YES  : Go to  C3.
    2. NO  : INSTALL a new dimmer switch. TEST the system for normal operation.
  3. C3 CHECK CIRCUIT 2085 (VT/YE) FOR AN OPEN 
    • Disconnect: SJB C2280b
      • Fig 1: Measuring Resistance Between SJB C2280B-14 & Dimmer Control Switch C2298-5
      GF0016164Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280b-14, circuit 2085 (VT/YE), harness side and the dimmer switch C2298-5, circuit 2085 (VT/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. C4 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 . 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.
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