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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 600 (Handles, Locks, Latches And Entry Systems) >> Diagnosis And Testing >> Handles, Locks, Latches and Entry Systems - Without Intelligent Access (IA) >> Pinpoint Tests >> Pinpoint Test I : All Door Locks Are Inoperative >> Pinpoint Test I : All Door Locks Are Inoperative

Pinpoint Test I : All Door Locks Are Inoperative

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. I1 CHECK FOR BCM DTC B126A:01

    • Ignition ON.
    • Using a diagnostic scan tool, carry out the BCM self-test.

    Is DTC B126A:01 present? 

    Yes  GO to Pinpoint Test K .
    No  GO to  I2.

  2. I2 VERIFY THE OPERATION OF BOTH DOOR LOCK CONTROL SWITCHES

    • Press the lock and unlock buttons on each door lock control switch while observing the door lock operation.

    Are the door locks inoperative from both switches? 

    Yes  GO to  I3.
    No  GO to Pinpoint Test L .

  3. I3 VERIFY ALL DOOR LOCKS ARE INOPERATIVE

    • Press the lock and unlock buttons from a door lock control switch while observing the door locks.

    Are all the door locks inoperative from both switch positions (lock and unlock)? 

    Yes  VERIFY the BCM fuse 20 (20A) is OK. If OK, GO to  I4.If not OK, GO to  I6.
    No  GO to Pinpoint Test K .

  4. I4 CHECK THE POWER DOOR LOCK RELAY GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280D-16
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  I5.
    No  REPAIR the circuit.

  5. I5 CHECK THE ALL DOOR LOCK CIRCUIT FOR AN OPEN

    • Disconnect: Right Front Door Lock Actuator C605 .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2280D-26
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C605-1

    Is the resistance less than 3 ohms? 

    Yes  GO to  I7.
    No  REPAIR the circuit.

  6. I6 CHECK THE ALL LOCK CIRCUIT FOR A SHORT TO GROUND

    • Install a new BCM fuse 20 (20A).
    • Operate the door lock actuators by pressing the lock button on the door lock control switch several times.

    Is the BCM fuse 20 (20A) OK? 

    Yes  REPAIR the unlock circuit for a short to ground.
    No  REPAIR the all lock circuit for a short to ground.

  7. I7 CHECK FOR CORRECT BCM OPERATION

    • Disconnect and inspect all the BCM connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect the BCM connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK On-Line Automotive Service Information System (OASIS) for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, BCM Hardware Testing
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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