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Pinpoint Test E: The Occupant Classification System (OCS) Module Does Not Respond To The Diagnostic Scan Tool

  1. Refer to Module Communications Network for schematic and connector information. Refer to Supplemental Restraint System for schematic and connector information.

    Normal Operation and Fault Conditions 

    The OCSM communicates on the HS-CAN2.

    Possible Sources 

    • Fuse
    • Wiring, terminals and connector
    • OCSM

    Visual Inspection and Pre-checks 

    • Verify BCM fuse 35 (7.5A) is OK.

  2. E1 CHECK THE OCS (OCCUPANT CLASSIFICATION SYSTEM) MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Wait one minute.

    • Disconnect: OCS module C3043

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3043-1
      GFD429293Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  E2
    No  VERIFY the BCM fuse 35 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

  3. E2 CHECK THE OCS (OCCUPANT CLASSIFICATION SYSTEM) MODULE GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3043-4
      GFD429294Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  E3
    No  REPAIR the circuit.

  4. E3 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE OCS (OCCUPANT CLASSIFICATION SYSTEM) MODULE AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

    • Disconnect GWM C2431.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3043-2
      GFD429294Courtesy of FORD MOTOR COMPANY
      		 C2431-18
      C3043-3
      GFD429294Courtesy of FORD MOTOR COMPANY
      		 C2431-17

    Are the resistances less than 3 ohms? 

    Yes  CONNECT the GWM, GO to  E4
    No  REPAIR the circuit in question.

  5. E4 CHECK FOR CORRECT OCS (OCCUPANT CLASSIFICATION SYSTEM) MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect the OCS module connector and related in-line 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 OCS module connector and related in-line 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 OASIS for any applicable service articles: TSB, GSB, SSM or FSA If a service article exists for this concern, DISCONTINUE this test and FOLLOW service article instructions. If no service articles address this concern, INSTALL a new OCS module. REFER to: Occupant Classification System (OCS) Sensor . If equipped with multi-contour seats, REFER to: Occupant Classification System (OCS) Sensor - Vehicles With: Multi-Contour Seats
    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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