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Home >> Ford >> 2009 >> Explorer 4.6 8, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 161 (Instrument Cluster Illumination & Instrument Panel Illumination) >> Diagnostic Tests >> Instrument Cluster & Panel Illumination >> Pinpoint Tests >> Pinpoint Test G: The Instrument Panel Illumination Does Not Dim

Pinpoint Test G: The Instrument Panel Illumination Does Not Dim

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Cluster and Panel Illumination for schematic and connector information.

Normal Operation 

The lighting control module (LCM) supplies a variable pulse width modulated (PWM) voltage to the instrument panel switches through circuit 484 (OG/BK). The LCM uses the instrument panel dimmer switch to determine the intensity of switch illumination.

DTC B2212 (Panel Dim Switch Out Of Range) - is an on-demand DTC that sets when the LCM detects an out of range condition on the dimmer input switch circuit.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST G: THE INSTRUMENT PANEL ILLUMINATION DOES NOT DIM 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. G1 CHECK DTCs FROM THE LCM 
    • Check the recorded results from the LCM self-test.
    • Is DTC B2212 recorded? 
    1. YES  : Go to  G2.
    2. NO  : Go to  G6.
  2. G2 CHECK CIRCUIT 1036 (BN/WH) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: LCM C2145a
    • Key in ON position.
      • Fig 1: Checking Circuit For Short To Voltage
      GF0014444Courtesy of FORD MOTOR CO.
    • Measure the voltage between the LCM C2145a-7, circuit 1036 (BN/WH), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  G3.
  3. G3 VERIFY DTC B2212 
    • Key in OFF position.
      • Fig 2: Checking Switch Resistance
      GF0014445Courtesy of FORD MOTOR CO.
    • While rotating the instrument panel dimmer switch wheel from the maximum setting to the minimum setting, measure the resistance between the LCM C2145a-7, circuit 1036 (BN/WH), harness side and ground.
    • Does the resistance vary between 545 ohms and 25 ohms? 
    1. YES  : Go to  G7.
    2. NO  : Go to  G4.
  4. G4 CHECK CIRCUIT 1036 (BN/WH) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Instrument Panel Dimmer Switch C205b
      • Fig 3: Checking Circuit For Open Or Short To Ground
      GF0014446Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LCM C2145a-7, circuit 1036 (BN/WH), harness side and the instrument panel dimmer switch C205b-6, circuit 1036 (BN/WH), harness side; and between the LCM C2145a-7, circuit 1036 (BN/WH), harness side and ground.
    • Is the resistance less than 5 ohms between the LCM and the instrument panel dimmer switch, and greater than 10,000 ohms between the LCM and ground? 
    1. YES  : Go to  G5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. G5 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
      Fig 4: Checking Circuit For Open
      GF0014447Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument panel dimmer switch C205b-4, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. G6 CHECK CIRCUIT 484 (OG/BK) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: LCM C2145c
    • Key in ON position.
      • Fig 5: Checking Circuit For Short To Voltage
      GF0014448Courtesy of FORD MOTOR CO.
    • Measure the voltage between the LCM C2145c-3, circuit 484 (OG/BK), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  G7.
  7. G7 CHECK FOR CORRECT LCM OPERATION 
    • Key in OFF position.
    • Disconnect all the LCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the LCM 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 LCM. 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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