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Pinpoint Test C: The Restraints Control Module (RCM) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2022 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to Wiring Diagrams MODULE COMMUNICATIONS NETWORK for schematic and connector information. Refer to Wiring Diagrams Supplemental Restraint System for schematic and connector information.

    Normal Operation and Fault Conditions 

    The RCM communicates with the diagnostic scan tool through the HS-CAN2.

    Possible Sources 

    • Fuse
    • Wiring, terminals and connectors
    • RCM

    Visual Inspection and Pre-checks 

    • Verify BCM fuses 14 (10A) and 19 (7.5A) are OK.

    WARNING: Never probe the electrical connectors on airbag, Safety Canopy® or side air curtain assemblies. Failure to follow this instruction may result in the accidental deployment of these assemblies, which increases the risk of serious personal injury or death.
    WARNING: Never disassemble or tamper with seat belt deployable components, including pretensioners, load limiters and inflators. Never back probe deployable device electrical connectors. Tampering or back probing may cause an accidental deployment and result in personal injury or death.
    NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

  2. C1 CHECK THE RCM (RESTRAINTS CONTROL MODULE) CONNECTION

    • Ignition OFF.

    • Disconnect: RCM C310A and C310B.

    Are RCM C310A pin 19 and C310B pins 47 and 48 OK? 

    Yes  GO to  C2
    No  INSTALL a new wiring harness. REPOWER the Supplemental Restraint System (SRS). REFER to: Supplemental Restraint System (SRS) Repowering .

  3. C2 CHECK FOR BECMB (BATTERY ENERGY CONTROL MODULE B) NETWORK COMMUNICATION

    • Ignition ON.

    • Using a diagnostic scan tool, perform the network test.

    Does the BECMB pass the network test? 

    Yes  GO to  C3
    No  DIAGNOSE a module communication concern. GO to Pinpoint Test D 

  4. C3 RETRIEVE RECORDED BECMB (BATTERY ENERGY CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, perform a BECMB self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  DIAGNOSE the Diagnostic Trouble Codes (DTCs). REFER to: Airbag Supplemental Restraint System (SRS) .
    No  GO to  C4

  5. C4 CHECK THE RCM (RESTRAINTS CONTROL MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C310A-19
      GFD674675Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  C5
    No  VERIFY BCM fuses 14 (10A) and 19 (7.5A) are OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

  6. C5 CHECK THE RCM (RESTRAINTS CONTROL MODULE) CASE GROUND

    • Ignition OFF.

    • Measure the resistance between the RCM case and a good chassis ground.

    Is the resistance less than 3 ohms? 

    Yes  GO to  C6
    No  REPAIR the RCM case ground as necessary.

  7. C6 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE RCM (RESTRAINTS CONTROL MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

    Are the resistances less than 3 ohms? 

    Yes  GO to  C7
    No  REPAIR the circuit in question.

  8. C7 CHECK FOR CORRECT RCM (RESTRAINTS CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all the RCM 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 RCM connectors. Make sure they seat and latch correctly.

    • Repower the Supplemental Restraint System (SRS).

    • 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, General Service Bulletin (GSB), SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new RCM. Refer to the RESTRAINTS CONTROL MODULE (RCM) .
    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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