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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 146 (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 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, Interior Lamps 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 a path for ground supplied through the ajar switches by circuit 57 (BK) (early build) or circuit 676 (PK/OG) (late build), 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: The LCM may be configured for a police vehicle. In the police configuration, the LCM ignores the door ajar switch inputs for interior lighting. Check the LCM for correct configuration.
  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) (early build)
      676 (PK/OG) (late build)
      RH front C602b-1 57 (BK) (early build)
      676 (PK/OG) (late build)
      RH rear C820b-1 57 (BK) (early build)
      676 (PK/OG) (late build)
      LH rear C715b-1 57 (BK) (early build)
      676 (PK/OG) (late build)
    • 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 THE SUSPECT DOOR AJAR SWITCH 
    • 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)
      LH rear C715a-1 627 (BK/OG)
      RH rear C820a-1 627 (BK/OG)
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new door ajar switch for the switch in question. 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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