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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (Interior Lighting System) >> Diagnostic Tests >> Interior Lighting >> Pinpoint Tests >> Pinpoint Test E: The Courtesy Lamps Do Not Turn On With the Liftgate Or The Liftgate Glass Open >> Pinpoint Test E: The Courtesy Lamps Do Not Turn On With The Liftgate Or The Liftgate Glass Open

Pinpoint Test E: The Courtesy Lamps Do Not Turn On With The Liftgate Or The Liftgate Glass Open

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Make sure the interior lamp switches are in the DOOR position.
  1. E1 CHECK THE LIFTGATE AND LIFTGATE GLASS AJAR SWITCH OPERATION 
    • Key in OFF position.
    • Disconnect: Liftgate Ajar Switch C478
    • Disconnect: Liftgate Glass Ajar Switch C479
    • Measure the resistance between the suspect liftgate ajar switch connector pins, component side, while toggling the switch open and closed as follows:
      Location Connector-Pin Connector-Pin
      Liftgate ajar switch C478-1 C478-2
      Liftgate glass ajar switch C479-2 C479-3
    • Is the resistance less than 5 ohms when the switch is closed and greater than 10,000 ohms when the switch is open? 
    1. YES  : Go to  E2.
    2. NO  : INSTALL a new liftgate or liftgate glass ajar switch for the switch in question. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS article. TEST the system for normal operation.
  2. E2 CHECK CIRCUITS CPL44 (YE/OG) AND CPL58 (GY/OG) FOR A SHORT TO GROUND 
    • Measure the resistance between the liftgate ajar switch C478-1, circuit CPL44 (YE/OG), harness side and ground; and between the liftgate ajar switch C478-2, circuit CPL58 (GY/OG), harness side and ground.
      • Fig 1: Measuring Resistance
      GF0042732Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  3. E3 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB 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 SJB. 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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