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Pinpoint Test AZ : DTC B1318

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.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables .

  1. AZ1 RECHECK THE DSM DTCs

    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DSM Self-Test.
    • Clear the DTCs. Repeat the DSM self-test.

    Is DTC B1318 still present? 

    Yes  GO to  AZ2.
    No  The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.

  2. AZ2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM

    • Enter the following diagnostic mode on the scan tool: PCM Self-Test.
    • Retrieve the continuous memory DTCs from the PCM.

    Is DTC P0620, P0625, P0626 or P065B set in the PCM? 

    Yes  REFER to Charging System .
    No  GO to  AZ3.

  3. AZ3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

    • Ignition OFF.

    Is the battery OK and fully charged? 

    Yes  GO to  AZ4.
    No  REFER to Charging System .

  4. AZ4 CHECK THE DSM VOLTAGE SUPPLY

    • Measure and record the voltage at the battery.
    • Disconnect: DSM C341A .
    • Ignition ON.
    • Measure the voltage between the DSM C341A-1 , circuit SBB74 (YE/RD), harness side and ground.
    1. GFD137539Courtesy of FORD MOTOR COMPANY

    Is the voltage within 0.2 volt of the recorded battery voltage? 

    Yes  GO to  AZ5.
    No  REPAIR the circuit for high resistance. CLEAR the DTC. REPEAT the self-test.

  5. AZ5 CHECK THE DSM GROUND CIRCUIT

    • Ignition OFF.
    • Disconnect: Negative Battery Cable.
    • Measure the resistance between the DSM C341A-2 , circuit GD143 (BK/VT), harness side and ground.
    1. GFD137540Courtesy of FORD MOTOR COMPANY

    Is the resistance less than 5 ohms? 

    Yes  CONNECT the negative battery cable. GO to  AZ6.
    No  REPAIR the circuit for high resistance. CONNECT the negative battery cable. TEST the system for normal operation.

  6. AZ6 CHECK FOR CORRECT DSM OPERATION

    • Disconnect the DSM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the DSM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes  INSTALL a new DSM. REFER to Driver Seat Module (DSM) . TEST the system for normal operation.
    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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