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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1419 (Handles, Locks, Latches And Entry Systems) >> Diagnostic Tests >> Locks, Latches and Entry Systems >> Pinpoint Tests >> Pinpoint Test A: All Door Locks Are Inoperative

Pinpoint Test A: All Door Locks Are 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 and to the luggage compartment lid latch (on vehicles without power luggage compartment lid release). 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 A: ALL DOOR LOCKS ARE INOPERATIVE 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. A1 VERIFY THE OPERATION OF BOTH DOOR LOCK CONTROL SWITCHES 
    • Press the lock and unlock button of both door lock control switches while observing the door lock operation.
    • Are the door locks inoperative from both switches? 
    1. YES  : Go to  A2.
    2. NO  : Go to Pinpoint Test D  .
  2. A2 RETRIEVE THE RECORDED DDM DTCs FROM THE SELF-TEST 
    • Check for recorded DDM DTCs from the self-test.
    • Are any DTCs retrieved? 
    1. YES  : REFER to DTC Charts .
    2. NO  : Go to  A3.
  3. A3 CHECK CIRCUIT 1213 (WH/LB) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: DDM C501b
      • Fig 1: Measuring Voltage
      GF0047522Courtesy of FORD MOTOR CO.
    • Measure the voltage between the DDM C501b-10, circuit 1213 (WH/LB), harness side and ground, and between the DDM C501b-11, circuit 1213 (WH/LB), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  A7.
    2. NO  : VERIFY the BJB fuse 8 (20A) is OK.

      If OK, REPAIR the circuit in question for an open. TEST the system for normal operation.

      If not OK (vehicles without a power luggage compartment lid), go to  A4.

      If not OK (vehicles with a power luggage compartment lid), go to  A6.

  4. A4 CHECK CIRCUIT 605 (RD) FOR A SHORT TO GROUND 
    • Connect: DDM C501b
      • NOTE: If the BJB fuse 8 (20A) fails immediately, repair circuit 1213 (WH/LB) for a short to ground.
    • Install a new BJB fuse 8 (20A).
    • Operate the luggage compartment lid release by pressing the luggage compartment lid release switch.
    • Is the BJB fuse 8 (20A) OK? 
    1. YES  : Go to  A6.
    2. NO  : Go to  A5.
  5. A5 CHECK THE LUGGAGE COMPARTMENT LID RELEASE SOLENOID 
    • Connect: Luggage Compartment Lid Latch C430
    • Install a new BJB fuse 8 (20A).
    • Operate the luggage compartment lid release by pressing the luggage compartment lid release switch.
    • Is the BJB fuse 8 (20A) OK? 
    1. YES  : INSTALL a new luggage compartment lid latch. REFER to Luggage Compartment Lid Latch . TEST the system for normal operation.
    2. NO  : REPAIR circuit 605 (RD) for a short to ground. TEST the system for normal operation.
  6. A6 CHECK CIRCUIT 117 (PK/BK) FOR A SHORT TO GROUND 
    • Connect: DDM C501b
      • NOTE: If the BJB fuse 8 (20A) fails immediately, repair circuit 1213 (WH/LB) for a short to ground.
    • Install a new BJB fuse 8 (20A).
    • Operate the door lock actuators by pressing LOCK on the door lock control switch.
    • Is the BJB fuse 8 (20A) OK? 
    1. YES  : REPAIR circuit 118 (PK/OG) or circuit 163 (RD/OG) for a short to ground. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. A7 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Disconnect: Negative Battery Cable
      • Fig 2: Measuring Resistance
      GF0047523Courtesy of FORD MOTOR CO.
    • Measure the resistance between the DDM C501b-24, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A8.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. A8 CHECK CIRCUIT 117 (PK/BK) FOR AN OPEN 
    • Disconnect: LH Front Door Lock Actuator C525
      • Fig 3: Checking Circuit For Open
      GF0013239Courtesy of FORD MOTOR CO.
    • Measure the resistance between the DDM C501b-1, circuit 117 (PK/BK), harness side and the LH front door lock actuator C525-2, circuit 117 (PK/BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A9.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  9. A9 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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