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Home >> Ford >> 2011 >> Fiesta S, Automatic DCT >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster Illumination And Panel Illumination >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test A: All Dimmable Illumination Does Not Increase/Decrease Brightness >> Pinpoint Test A: All DIMMABLE Illumination Does Not Increase/Decrease Brightness

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

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 THE RECORDED RESULTS FROM THE BCM ON-DEMAND SELF-TEST 
    • Ignition OFF.
    • Review the recorded results from the BCM  on-demand self-test.
    • Is DTC B134E:23 present? 
    • Yes:  Go to A2  .
    • No:  Go to  A4.
  2. A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH FOR A SHORT TO GROUND 
    • Disconnect: Instrument Panel Dimmer Switch C2298.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: BCM  Self-Test.
    • Clear the DTCs and repeat the BCM  self-test.
    • Is on-demand DTC B134E:23 still present? 
    • Yes:  Go to A3  .
    • No:  Install a new instrument panel dimmer switch. Refer to INSTRUMENT PANEL DIMMER SWITCH  in this 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: BCM  C2280E.
    • Measure the resistance between the instrument panel dimmer switch C2298-3, circuit CLN56 (BN/VT), harness side and ground; and between the instrument panel dimmer switch C2298-7, circuit CLN55 (YE/VT), harness side and ground.
      Fig 1: Checking Instrument Panel Dimmer Switch Input Circuits For A Short To Ground
      G06937342Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  Go to  A7.
    • 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 C2298.
    • NOTE: For this step, the PID should indicate "DIMMER" each time the fused jumper wire is connected.
    • For the illumination decrease function, while monitoring the BCM  PID IP_DIMMER_SW, connect and disconnect a fused jumper wire between the instrument panel dimmer switch C2298-3, circuit CLN56 (BN/VT), harness side and the instrument panel dimmer switch C2298-4, circuit GD115 (BK/GY), harness side.
      Fig 2: Connecting Fused Jumper Wire Between Instrument Panel Dimmer Switch Circuits
      G06937343Courtesy of FORD MOTOR CO.
    • NOTE: For this step, the PID should indicate "BRIGHTER" each time the fused jumper wire is connected.
    • For the illumination increase function, while monitoring the BCM  PID IP_DIMMER_SW, connect and disconnect a fused jumper wire between the instrument panel dimmer switch C2298-7, circuit CLN55 (YE/VT), harness side and the instrument panel dimmer switch C2298-4, circuit GD115 (BK/GY), harness side.
      Fig 3: Connecting Fused Jumper Wire Between Instrument Panel Dimmer Switch C2298-7 And C2298-4
      G06937344Courtesy of FORD MOTOR CO.
    • Does the PID indication agree with the fused jumper wire position? 
    • Yes:  INSTALL a new instrument panel dimmer switch. Refer to INSTRUMENT PANEL DIMMER SWITCH  in this information. Test the system for normal operation.
    • No:  Go to A5  .
  5. A5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH GROUND CIRCUIT 
    • NOTE: For this step, the PID should indicate "DIMMER" each time the fused jumper wire is connected to C2298-3, and "BRIGHTER" each time the fused jumper wire is connected to C2298-7.
    • While monitoring the BCM  PID IP_DIMMER_SW, connect and disconnect a fused jumper wire between the instrument panel dimmer switch C2298-3, circuit CLN56 (BN/VT), harness side and ground; and between the instrument panel dimmer switch C2298-7, circuit CLN55 (YE/VT), harness side and ground.
      Fig 4: Connecting Fused Jumper Wire Between Instrument Panel Dimmer Switch & Ground
      G06937345Courtesy of FORD MOTOR CO.
    • Does the PID indication agree with the fused jumper wire position? 
    • Yes:  REPAIR circuit GD115 (BK/GY) for an open. TEST the system for normal operation.
    • No:  Go to A6  .
  6. A6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH DIM UP AND DIM DOWN CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: BCM  C2280E.
    • Measure the resistance between the instrument panel dimmer switch C2298-3, circuit CLN56 (BN/VT), harness side and the BCM  C2280E-11, circuit CLN56 (BN/VT), harness side.
      Fig 5: Checking Instrument Panel Dimmer Switch & Dim Down Circuits For An Open
      G06937346Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument panel dimmer switch C2298-7, circuit CLN55 (YE/VT), harness side and the BCM  C2280E-12, circuit CLN55 (YE/VT), harness side.
      Fig 6: Measuring Resistance Between Instrument Panel Dimmer Switch & BCM
      G06937347Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  Go to A7  .
    • No:  REPAIR the circuit in question for an open. TEST the system for normal operation.
  7. A7 CHECK FOR CORRECT BCM OPERATION 
    • Connect all disconnected connectors.
    • Disconnect all the BCM  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the BCM  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 BCM  . Refer to MULTIFUNCTION ELECTRONIC MODULES . 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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