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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1408 (Interior Lighting System) >> Diagnostic Tests >> Interior Lighting >> Pinpoint Tests >> Pinpoint Test J: The Ambient Lighting Is Inoperative >> Pinpoint Test K: The Ambient Lighting Is Inoperative

Pinpoint Test K: The Ambient Lighting Is Inoperative

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING & CABLES .
  1. J1 CHECK CIRCUIT CBP08 (GY/YE)/CBX07 (GN/RD) FOR AN OPEN (TO AMBIENT LIGHTING MODULE) 
    • Key in OFF position.
    • Disconnect: Ambient Lighting Module C3251
    • Key in ON position.
    • Measure the voltage between the ambient lighting module C3251-1, circuit CBX07 (GN/RD), harness side and ground.
      • Fig 1: Checking Circuit CBP08 (GY/YE)/CBX07 (GN/RD) For An Open (To Ambient Lighting Module)
      GF0040660Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J2.
    2. NO  : REPAIR circuit CBX07 (GN/RD) or CBP08 (GY/YE). TEST the system for normal operation.
  2. J2 CHECK THE INPUT FROM CIRCUIT CLN54 (BN/YE) 
    • While pressing and releasing the ambient lighting switch, measure the voltage between the ambient lighting module C3251-2, circuit CLN54 (BN/YE), harness side and ground.
      • Fig 2: Checking Input From Circuit CLN54 (BN/YE)
      GF0040661Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts with the switch pressed, and 0 volts with the switch released? 
    1. YES  : Go to  J3.
    2. NO  : If voltage is always present, go to  J4.

      If no voltage is present, go to  J5.

  3. J3 CHECK CIRCUIT GD908 (BK)/GD116 (BK/VT) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the ambient lighting module C3251-8, circuit GD908 (BK), harness side and ground.
      • Fig 3: Checking Circuit GD908 (BK)/GD116 (BK/VT) For An Open
      GF0040662Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  J7.
    2. NO  : REPAIR circuit GD908 (BK) or GD116 (BK/VT). TEST the system for normal operation.
  4. J4 CHECK CIRCUIT CLN54 (BN/YE) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Ambient Lighting Switch C3250
    • Key in ON position.
    • Measure the voltage between the ambient lighting module C3251-2, circuit CLN54 (BN/YE), harness side and ground.
      • Fig 4: Checking Circuit CLN54 (BN/YE) For A Short To Voltage
      GF0040661Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : INSTALL a new ambient lighting switch. REFER to AMBIENT LIGHTING SWITCH . TEST the system for normal operation.
  5. J5 CHECK CIRCUIT CBX07 (GN/RD) FOR AN OPEN (TO THE AMBIENT LIGHTING SWITCH) 
    • Disconnect: Ambient Lighting Switch C3250
    • Measure the voltage between the ambient lighting switch C3250-2, circuit CBX07 (GN/RD), harness side and ground.
      • Fig 5: Checking Circuit CBX07 (GN/RD) For An Open (To The Ambient Lighting Switch)
      GF0041654Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. J6 CHECK THE AMBIENT LIGHTING SWITCH 
    • Connect: Ambient Lighting Module C3251
    • Connect and remove a fused jumper wire between the ambient lighting switch C3250-2, circuit CBX07 (GN/RD), harness side and the ambient lighting switch C3250-6, circuit CBX07 (GN/RD), harness side.
      • Fig 6: Checking Ambient Lighting Switch
      GF0041655Courtesy of FORD MOTOR CO.
    • Do the ambient lighting LEDs illuminate and cycle through a color change each time the jumper wire is connected and removed? 
    1. YES  : INSTALL a new ambient lighting switch. REFER to AMBIENT LIGHTING SWITCH . TEST the system for normal operation.
    2. NO  : REPAIR circuit CLN54 (BN/YE) for an open. TEST the system for normal operation.
  7. J7 CHECK THE AMBIENT LIGHTING HARNESS 
    • Key in OFF position.
    • Check the diode circuits between the ambient lighting module, harness side as follows:
      Connector-Pin/Circuit Connector-Pin/Circuit
      C3251-5
      CLN45 (GN)      		 C3251-4
      RLN44 (BN)
      C3251-6
      CLN45 (GN)      		 C3251-4
      RLN44 (BN)
      C3251-7
      CLN44 (OG)      		 C3251-4
      RLN44 (BN)
      • Fig 7: Checking Diode Circuits
      GF0040665Courtesy of FORD MOTOR CO.
    • Does the meter indicate that each circuit is OK? 
    1. YES  : Go to  J8.
    2. NO  : INSTALL a new ambient lighting harness. TEST the system for normal operation.
  8. J8 CHECK FOR CORRECT AMBIENT LIGHTING MODULE OPERATION 
    • Connect: Ambient Lighting Switch C3250
    • Disconnect the ambient lighting module connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the ambient lighting module connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new ambient lighting module. REFER to AMBIENT LIGHTING MODULE . 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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