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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 I: The Puddle Lamps Are Inoperative >> Pinpoint Test I: The Puddle Lamp(S) Are Inoperative

Pinpoint Test I: The Puddle Lamp(S) Are 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. I1 CHECK THE COURTESY LAMP OPERATION 
    • Ignition OFF.
    • Operate the courtesy lamps using the instrument panel dimmer switch
    • Do the courtesy lamps illuminate? 
    1. YES  : Go to  I2.
    2. NO  : Go to PINPOINT TEST A .
  2. I2 CHECK CIRCUIT CLN26 (BU) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Suspect Exterior Mirror
    • Operate the courtesy lamps using the instrument panel dimmer switch
    • Measure the voltage between the suspect exterior mirror, harness side and ground as follows:
      Location Connector-Pin Circuit
      RH exterior mirror (without memory) C625-4 CLN26 (BU)
      RH exterior mirror (with memory) C626-5 CLN26 (BU)
      LH exterior mirror (without memory) C517-4 CLN26 (BU)
      LH exterior mirror (with memory) C522-5 CLN26 (BU)
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  I3.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  3. I3 CHECK THE GROUND CIRCUIT FOR AN OPEN 
    • Measure the resistance between the suspect exterior mirror, harness side and ground as follows:
      Location Connector-Pin Circuit
      RH exterior mirror (without memory) C625-6 GD139 (BK/YE)
      RH exterior mirror (with memory) C626-7 GD139 (BK/YE)
      LH exterior mirror (without memory) C517-6 GD126 (BK/WH)
      LH exterior mirror (with memory) C522-7 GD126 (BK/WH)
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new exterior mirror for the suspect exterior mirror. REFER to REAR VIEW MIRRORS article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
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