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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.
  1. 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? 
    1. YES  : For DTC B2A33 or B29B8, go to  A3.

      For DTC B2A32 or B29B7, go to  A4.

    2. NO  : Go to  A2.
  2. A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger
    • Monitor the SJB PID BACK_LT 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  A7.
    2. NO  : INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch . CLEAR the DTCs. REPEAT the self-test.
  3. A3 CHECK CIRCUIT VLN18 (BU/WH) OR CIRCUIT VLN04 (VT/GY) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280g
      • Fig 1: Checking Circuit For Short To Ground
      GF0023318Courtesy of FORD MOTOR CO.
    • For DTC B2A33, connect a fused (5A) jumper wire between the SJB C2280g-39, circuit VLN18 (BU/WH) and battery positive.
      • Fig 2: Checking Circuit For Short To Ground
      GF0023319Courtesy of FORD MOTOR CO.
    • For DTC B29B8, connect a fused (5A) jumper wire between the SJB C2280g-52, circuit VLN04 (VT/GY) and battery positive.
    • Do(es) the backlighting component(s) illuminate? 
    1. YES  : REMOVE the jumper wire. Go to  A7.
    2. NO  : REMOVE the jumper wire. VERIFY the BJB fuse 10 (15A) is OK. REPAIR the circuit in question for a short to ground. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT VLN18 (BU/WH) OR CIRCUIT VLN04 (VT/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280g
      • Fig 3: Checking Circuit For Open
      GF0023318Courtesy of FORD MOTOR CO.
    • For DTC B2A32, connect a fused (5A) jumper wire between the SJB C2280g-39, circuit VLN18 (BU/WH) and battery positive.
      • Fig 4: Checking Circuit For Open
      GF0023319Courtesy of FORD MOTOR CO.
    • For DTC B29B7, connect a fused (5A) jumper wire between the SJB C2280g-52, circuit VLN04 (VT/GY) and battery positive.
    • Do(es) the backlighting component(s) illuminate? 
    1. YES  : REMOVE the jumper wire. Go to  A7.
    2. NO  : For Navigator if the auxiliary climate control assembly illumination is inoperative, REMOVE the jumper wire. Go to  A5.

      For all others, REMOVE the jumper wire. REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.

  5. A5 CHECK CIRCUIT GD143 (BK/VT) FOR AN OPEN 
    • Disconnect: Auxiliary Climate Control Assembly C3198
      • Fig 5: Checking Circuit For Open
      GF0023320Courtesy of FORD MOTOR CO.
    • Measure the resistance between the auxiliary climate control assembly C3198-3, circuit GD143 (BK/VT), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A6.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. A6 CHECK CIRCUIT VLN18 (BU/WH) FOR AN OPEN 
    • Connect: SJB C2280g
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
      • Fig 6: Checking Circuit For Open
      GF0023321Courtesy of FORD MOTOR CO.
    • Measure the voltage between the auxiliary climate control assembly C3198-1, circuit VLN18 (BU/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : INSTALL a new auxiliary climate control assembly. REFER to AUXILIARY CLIMATE CONTROL article. CLEAR the DTCs. REPEAT the self-test.
  7. A7 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.
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