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Home >> Mercury >> 2007 >> Montego Premier, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster System And Panel Illumination >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test F: The Control Illumination Does Not Dim >> Pinpoint Test F: The Instrument Panel Illumination Does Not Dim

Pinpoint Test F: The Instrument Panel Illumination Does Not Dim

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. F1 CHECK THE EXTERIOR LAMP OPERATION 
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Are the parking lamps illuminated? 
    1. YES  : Go to  F2.
    2. NO  : REFER to EXTERIOR LIGHTING article.
  2. F2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH CIRCUITRY FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Panel Dimmer Switch C2065
    • Disconnect: SJB C2280d
      • Fig 1: Checking Circuit For Open
      GF0018112Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280d-29, circuit 1403 (BK/WH), harness side and the instrument panel dimmer switch C2065-6, circuit 1403 (BK/WH), harness side; and between the SJB C2280d-22, circuit 1036 (BN/WH), harness side and the instrument panel dimmer switch C2065-4, circuit 1036 (BN/WH), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  F3.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  3. F3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH CIRCUITRY FOR A SHORT TO GROUND 
      Fig 2: Checking Circuit For Short To Ground
      GF0018113Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280d-29, circuit 1403 (BK/WH), harness side and ground; and between the SJB C2280d-22, circuit 1036 (BN/WH), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  F4.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  4. F4 CHECK THE INSTRUMENT PANEL DIMMER SWITCH CIRCUITRY FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 3: Checking Circuit For Voltage
      GF0018114Courtesy of FORD MOTOR CO.
    • Measure the voltage between the SJB C2280d-29, circuit 1403 (BK/WH), harness side and ground; and between the SJB C2280d-22, circuit 1036 (BN/WH), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit in question. TEST the system for normal operation.
    2. NO  : Go to  F5.
  5. F5 CHECK FOR CORRECT INSTRUMENT PANEL DIMMER SWITCH OPERATION 
      Fig 4: Checking Instrument Panel Dimmer Switch Operation
      GF0018115Courtesy of FORD MOTOR CO.
    • While rotating the instrument panel dimmer switch wheel from the low to the full illumination position, measure the resistance between the SJB C2280d-29, circuit 1403 (BK/WH), harness side and the SJB C2280d-22, circuit 1036 (BN/WH), harness side.
    • Does the resistance value change while rotating the instrument panel dimmer switch wheel? 
    1. YES  : Go to  F6.
    2. NO  : INSTALL a new instrument panel dimmer switch. TEST the system for normal operation.
  6. F6 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? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. 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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