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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1585 (Handles, Locks, Latches And Entry Systems) >> Diagnostic Tests >> Locks, Latches and Entry Systems >> Pinpoint Tests >> Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative

Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative

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, Power Door Locks for schematic and connector information.

Normal Operation 

The battery junction box (BJB) fuse 8 (20A) provides voltage for the power lock/unlock system. The voltage is supplied to the driver door module (DDM) through circuit 1213 (WH/LB). Ground for the power lock/unlock system is provided to the DDM through circuit 57 (BK). The DDM contains internal relays that are energized depending upon the input received. When the DDM receives a lock request the DDM provides voltage to the door lock actuators on circuit 117 (PK/BK). Ground for the LH front door lock actuator is provided by circuit 163 (RD/OG) and ground for the remaining door lock actuators is provided by circuit 118 (PK/OG). When the DDM receives an unlock request, voltage and ground are reversed on the previously listed circuits.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST B: A SINGLE/MORE THAN ONE DOOR LOCK IS INOPERATIVE 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. B1 CHECK THE DOOR LATCH FOR BINDING 
    • Lock and unlock the inoperative door lock using the door lock rod.
    • Does the door lock and unlock? 
    1. YES  : Go to  B2.
    2. NO  : INSTALL a new door latch. REFER to Front Door Latch  or Rear Door Latch . TEST the system for normal operation.
  2. B2 CHECK CIRCUIT 117 (PK/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Inoperative Door Lock Actuator
      • Fig 1: Checking Circuit 118 (PK/OG) For Voltage
      GF0040812Courtesy of FORD MOTOR CO.
      NOTE: The DDM only supplies voltage to the actuator momentarily. It is important to monitor the meter while pressing the door lock control switch.
    • While pressing the door lock control switch in the LOCK position, measure the voltage between the inoperative door lock actuator, harness side and ground as follows:
      Inoperative Door Lock Actuator Connector-Pin Circuit
      LH front C525-2 117 (PK/BK)
      RH front C609-2 117 (PK/BK)
      LH rear C705-2 117 (PK/BK)
      RH rear C805-2 117 (PK/BK)
    • Is the voltage momentarily greater than 10 volts? 
    1. YES  : Go to  B3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. B3 CHECK CIRCUIT 118 (PK/OG) OR CIRCUIT 163 (RD/OG) FOR VOLTAGE 
      Fig 2: Measuring Voltage
      GF0040811Courtesy of FORD MOTOR CO.
      NOTE: The DDM only supplies voltage to the actuator momentarily. It is important to monitor the meter while pressing the door lock control switch.
    • While pressing the door lock control switch in the UNLOCK position, measure the voltage between the inoperative door lock actuator, harness side and ground as follows:
      Inoperative Door Lock Actuator Connector-Pin Circuit
      LH front C525-1 163 (RD/OG)
      RH front C609-1 118 (PK/OG)
      LH rear C705-1 118 (PK/OG)
      RH rear C805-1 118 (PK/OG)
    • Is the voltage momentarily greater than 10 volts? 
    1. YES  : INSTALL a new door lock actuator. REFER to Door Lock Actuator . TEST the system for normal operation.
    2. NO  : Go to  B4.
  4. B4 CHECK CIRCUIT 118 (PK/OG) OR CIRCUIT 163 (RD/OG) FOR AN OPEN 
    • Disconnect: DDM C501b
    • Measure the resistance between the inoperative door lock actuator, harness side and the DDM, harness side as follows:
      Inoperative Door Lock Actuator Connector-Pin DDM Connector-Pin Circuit
      LH front C525-1 C501b-8
      C501b-9      		 163 (RD/OG)
      RH front C609-1 C501b-13 118 (PK/OG)
      LH rear C705-1 C501b-13 118 (PK/OG)
      RH rear C805-1 C501b-13 118 (PK/OG)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. B5 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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