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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1716 (Interior Lighting System) >> Diagnostic Tests >> Interior Lighting >> Pinpoint Tests >> Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open

Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Driver Door Module for schematic and connector information.

Normal Operation 

The driver door module (DDM) monitors the LH front door ajar switch on circuit 867 (DB), and the remaining door ajar switches on circuit 627 (BK/OG). The door ajar switches provide ground through circuit 57 (BK), indicating an open door. The DDM then signals the lighting control module (LCM) to supply power to the courtesy lamps.

This pinpoint test is intended to diagnose the following: 

PINPOINT TEST D: THE COURTESY LAMPS DO NOT TURN ON WITH ONE DOOR OPEN 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. D1 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Suspect Door Ajar Switch
    • Measure the resistance between the suspect door ajar switch connector, harness side and ground as follows:
      Suspect Door Ajar Switch Connector-Pin Circuit
      LH front C526b-1 57 (BK)
      RH front C602b-1 57 (BK)
      RH rear C820b-1 57 (BK)
      LH rear C715b-1 57 (BK)
    • Is the resistance less than 5 ohms at the suspect door ajar switch? 
    1. YES  : Go to  D2.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  2. D2 CHECK VOLTAGE FROM DDM 
    • Measure the voltage between the suspect door ajar switch connector, harness side and ground as follows:
      Suspect Door Ajar Switch Connector-Pin Circuit
      LH front C526a-1 867 (DB)
      RH front C602a-1 627 (BK/OG)
      RH rear C820a-1 627 (BK/OG)
      LH rear C715a-1 627 (BK/OG)
    • Is the voltage greater than 10 volts at the suspect door ajar switch? 
    1. YES  : INSTALL a new door ajar switch in question. REFER to HANDLES, LOCKS, LATCHES & ENTRY SYSTEMS article. TEST the system for normal operation.
    2. NO  : Go to  D3.
  3. D3 CHECK THE DOOR AJAR REFERENCE CIRCUIT FOR AN OPEN 
    • Disconnect: DDM C501a and C501b
    • Measure the resistance between the suspect door ajar switch, harness side and the DDM, harness side as follows:
      Suspect Door Ajar Switch Door Ajar Switch Connector-Pin DDM Connector-Pin Circuit
      LH front C526a-1 C501a-22 867 (DB)
      RH front C602a-1 C501b-7 627 (BK/OG)
      RH rear C820a-1 C501b-7 627 (BK/OG)
      LH rear C715a-1 C501b-7 627 (BK/OG)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D4.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  4. D4 CHECK FOR CORRECT DDM OPERATION 
    • Disconnect all the DDM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the DDM 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 DDM. 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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