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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 188 (Instrument Cluster Illumination And Panel Illumination - F150) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test A: All Dimmable Illumination Does Not Dim >> Pinpoint Test A: All DIMMABLE Illumination Does Not Dim

Pinpoint Test A: All DIMMABLE Illumination Does Not Dim

WARNING: This page is about a different car, the 2012 Ford Pickup. 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 THE RECORDED RESULTS FROM THE SCCM ON-DEMAND SELF-TEST 
    • Ignition OFF.
    • Review the recorded results from the SCCM on-demand self-test.
    • Is DTC B1124:09 present? 
      • YES  : GO to A2.
      • No  : GO to  A4.
  2. A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Disconnect: Instrument Panel Dimmer Switch C2298.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SCCM Self-Test.
    • Clear the DTCs and repeat the SCCM self-test.
    • Is DTC B1124:09 still present? 
      • YES  : GO to A3.
      • No  : INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch  . TEST the system for normal operation.
  3. A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SCCM C2414A.
    • Measure the resistance between the instrument panel dimmer switch, harness side and ground as follows:
      Connector-Pin Circuit
      C2298-2 VLN36 (GY/OG)
      C2298-3 CLN55 (YE/VT)
      C2298-7 CLN56 (BN/VT)
      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 C2298.
    • Carry out the instrument panel dimmer switch component test. Refer to OEM COMPONENT TESTING - F150 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  . TEST the system for normal operation.
  5. A5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH UP AND DOWN INPUT CIRCUITS FOR VOLTAGE 
    • Ignition ON.
    • Measure the voltage between the instrument panel dimmer switch C2298-7, circuit CLN56 (BN/VT), harness side and ground; and between the instrument panel dimmer switch C2298-3, circuit CLN55 (YE/VT), harness side and ground.
      Fig 2: Measuring Voltage Between Instrument Panel Dimmer Switch C2298-7, Circuit CLN56 (BN/VT), Harness Side And Ground
      G06260867Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 5 volts? 
      • YES  : GO to  A7.
      • No  : GO to A6.
  6. A6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH UP AND DOWN INPUT CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: SCCM C2414A.
    • Measure the resistance between the instrument panel dimmer switch C2298-7, circuit CLN56 (BN/VT), harness side and the SCCM C2414A-19, circuit CLN56 (BN/VT), harness side.
      Fig 3: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-7, Circuit CLN56 (BN/VT) And SCCM C2414A-19, Circuit CLN56 (BN/VT)
      G07413282Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument panel dimmer switch C2298-3, circuit CLN55 (YE/VT), harness side and the SCCM C2414A-6, circuit CLN55 (YE/VT), harness side.
      Fig 4: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-3, Circuit CLN55 (YE/VT) And SCCM C2414A-6, Circuit CLN55 (YE/VT)
      G07413283Courtesy 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: SCCM C2414A.
    • Ignition ON.
    • Measure the voltage between the instrument panel dimmer switch, harness side and ground as follows:
      Connector-Pin Circuit
      C2298-2 VLN36 (GY/OG)
      C2298-3 CLN55 (YE/VT)
      C2298-4 RLN29 (WH/OG)
      C2298-7 CLN56 (BN/VT)
      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 C2298-4, circuit RLN29 (WH/OG), harness side and the SCCM C2414A-26, circuit RLN29 (WH/OG), harness side.
      Fig 6: Measuring Resistance Between Instrument Panel Dimmer Switch C2298-4, Circuit RLN29 (WH/OG) And SCCM C2414A-26, Circuit RLN29 (WH/OG)
      G07413285Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • YES  : GO to A9.
      • No  : REPAIR the circuit for an open. TEST the system for normal operation.
  9. A9 CHECK FOR CORRECT SCCM OPERATION 
    • Connect all disconnected connectors.
    • Disconnect all the SCCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SCCM 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 SCCM. REFER to STEERING COLUMN SWITCHES . 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. 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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