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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1757 (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 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 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? 
    • Yes  : GO to A3.
    • No  : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH  in this service information. TEST the system for normal operation.
  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:
      Connector-Pin Circuit
      C2065-2 CLN28 (GN/BU)
      C2065-3 CLN27 (WH/BN)
      C2065-7 CLN12 (YE)
      Fig 1: Measuring Resistance Between Instrument Panel Dimmer Switch , Harness Side And Ground
      G06260866Courtesy 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 ILLUMINATION DIMMER SWITCH article for hybrid or ILLUMINATION DIMMER SWITCH article for component testing.
    • Is the instrument panel dimmer switch OK? 
    • Yes  : GO to A5.
    • No  : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH  in this service information. 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: Checking Instrument Panel Dimmer Switch Dim Up And Dim Down Input Circuits For Voltage
      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, Circuit CLN12 (YE), Harness Side And SJB C2280b-28, Circuit CLN12 (YE)
      G07787338Courtesy 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, Circuit CLN27 (WH/BN) And SJB C2280b-36, Circuit CLN27 (WH/BN)
      G06260869Courtesy 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:
      Connector-Pin Circuit
      C2065-2 CLN28 (GN/BU)
      C2065-3 CLN27 (WH/BN)
      C2065-4 RLN29 (WH/OG)
      C2065-7 CLN12 (YE)
      Fig 5: Measuring Voltage Between Instrument Panel Dimmer Switch , Harness Side And Ground
      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 Instrument Panel Dimmer Switch Return 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? 
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