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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1440 (Instrument Cluster Illumination And Panel Illumination) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test A: All Dimmable Illumination Does Not Dim/Increase Brightness >> Pinpoint Test A: All DIMMABLE Illumination Does Not Dim/Increase Brightness

Pinpoint Test A: All DIMMABLE Illumination Does Not Dim/Increase Brightness

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 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 DTCs FROM THE SJB SELF-TEST 
    • Ignition OFF.
    • Check the recorded DTCs from the SJB on-demand self-test.
    • Is DTC B213A present? 
    • Yes:  GO to  A2.
    • No:  GO to  A4.
  2. A2 REPEAT THE SJB SELF-TEST WITH THE INSTRUMENT PANEL DIMMER SWITCH DISCONNECTED 
    • Disconnect: Instrument Panel Dimmer Switch C2065.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB Self-Test.
    • Clear the DTCs and repeat the SJB on-demand self-test.
    • Is on-demand DTC B213A still present? 
  3. A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SJB C2280b.
    • Measure the resistance between the instrument panel dimmer switch, harness side and ground as follows:
      TERMINAL RESISTANCE REFERENCE TABLE

      Connector-Pin Circuit
      C2065-2 CLN28 (GN/BU)
      C2065-3 CLN27 (WH/BN)
      C2065-7 CLN12 (YE)
      Fig 1: Checking Circuit In Question For Short To Ground
      G06271110Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  GO to  A9.
    • No:  REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  4. A4 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Disconnect: Instrument Panel Dimmer Switch C2065.
    • Carry out the instrument panel dimmer switch component test.

      Refer to COMPONENT TESTING .

    • Is the instrument panel dimmer switch OK? 
    • Yes:  GO to  A5.
    • No:  INSTALL a new instrument panel dimmer switch. REFER to Removal and Installation . TEST the system for normal operation.
  5. A5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM UP AND DIM DOWN INPUT CIRCUITS FOR VOLTAGE 
    • Ignition ON.
    • Measure the voltage between the instrument panel dimmer switch C2065-7, circuit CLN12 (YE), harness side and ground; and between the instrument panel dimmer switch C2065-3, circuit CLN27 (WH/BN), harness side and ground.
      Fig 2: Measuring Voltage Between Instrument Panel Dimmer Switch C2065-7 & Ground
      G06260867Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes:  GO to  A7.
    • No:  GO to  A6.
  6. A6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM UP AND DIM DOWN CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: SJB C2280b.
    • Measure the resistance between the instrument panel dimmer switch C2065-7, circuit CLN12 (YE), harness side and the SJB C2280b-28, circuit CLN12 (YE), harness side.
      Fig 3: Measuring Resistance Between Instrument Panel Dimmer Switch C2065-7 & SJB C2280B-28
      G06271112Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument panel dimmer switch C2065-3, circuit CLN27 (WH/BN), harness side and the SJB C2280b-36, circuit CLN27 (WH/BN), harness side.
      Fig 4: Measuring Resistance Between Instrument Panel Dimmer Switch C2065-3 & SJB C2280B-36
      G06271112Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  GO to  A9.
    • No:  REPAIR the circuit in question for an open. TEST the system for normal operation.
  7. A7 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT AND RETURN CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: SJB C2280b.
    • Ignition ON.
    • Measure the voltage between the instrument panel dimmer switch, harness side and ground as follows:
      TERMINAL VOLTAGE REFERENCE TABLE

      Connector-Pin Circuit
      C2065-2 CLN28 (GN/BU)
      C2065-3 CLN27 (WH/BN)
      C2065-4 RLN29 (WH/OG)
      C2065-7 CLN12 (YE)
      Fig 5: Checking Circuit In Question For Short To Voltage
      G06260870Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR the circuit in question for a short to voltage. TEST the system for normal operation.
    • No:  GO to  A8.
  8. A8 CHECK THE INSTRUMENT PANEL DIMMER SWITCH RETURN CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between the instrument panel dimmer switch C2065-4, circuit RLN29 (WH/OG), harness side and the SJB C2280b-33, circuit RLN29 (WH/OG), harness side.
      Fig 6: Checking Circuit For An Open
      G06260871Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  A9.
    • No:  REPAIR circuit CLN27 (WH/BN) for an open. TEST the system for normal operation.
  9. A9 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 INSTALLATION . 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.
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