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Home >> Ford >> 2013 >> Fiesta Titanium, 4D Hatchback, Standard Trans >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> 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? 
  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: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-3, Circuit CLN56 (BN/VT), Harness Side And 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.
      Fig 2: Connecting Fused Jumper Wire Between Instrument Panel Dimmer Switch C2298-3, Circuit CLN56 (BN/VT) And C2298-4, Circuit GD115 (BK/GY)
      G06937343Courtesy of FORD MOTOR CO.
    • 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.
      • NOTE: For this step, the PID should indicate "BRIGHTER" each time the fused jumper wire is connected.
      Fig 3: Connecting Fused Jumper Wire Between Instrument Panel Dimmer Switch C2298-7, Circuit CLN55 (YE/VT) And C2298-4, Circuit GD115 (BK/GY)
      G06937344Courtesy of FORD MOTOR CO.
    • 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.
    • Does the PID indication agree with the fused jumper wire position? 
  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.
      Fig 4: Connecting Fused Jumper Wire Between Instrument Panel Dimmer Switch C2298-3, Circuit CLN56 (BN/VT), Harness Side And Ground
      G06937345Courtesy of FORD MOTOR CO.
    • 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.
    • 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: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-3, Circuit CLN56 (BN/VT) And BCM C2280E-11, Circuit CLN56 (BN/VT)
      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 C2298-7, Circuit CLN55 (YE/VT) And BCM C2280E-12, Circuit CLN55 (YE/VT)
      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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