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Pinpoint Test O: DTC B2792 - Cross Link Between Firing Loops Fault

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough Inspection and Verification before proceeding with the pinpoint test.
  1. O1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    WARNING: Restraint system diagnostic tools are for service only. Tools must be removed prior to operating the vehicle over the road. Failure to remove restraint system diagnostic tools could result in injury and possible violation of vehicle safety standards.
    WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.
    WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury.
    WARNING: Never probe the electrical connector on a safety canopy module. Doing so can result in safety canopy deployment.
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: View and Record DTC B2792 Fault PIDs
    • Was on-demand DTC B2792 retrieved? 
    1. YES  : This is a hard fault. The fault condition is still present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. Go to  O2 .
    2. NO  : This is an intermittent fault when present as a continuous memory DTC only (DTC not retrieved on demand). The fault condition is not present at this time. Go to  O4 .
  2. O2 CHECK DEPLOYABLE CIRCUITS FOR A CROSS LINK FAULT 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Disconnect: RCM C2041b and C2041a
    • Disconnect ALL of the affected  deployable devices as indicated by the fault PIDs in Step O1.
    • Using the following table, measure the resistance between the circuits of the affected deployable devices.
      DEPLOYABLE DEVICES

      Squib Connector - Pin Circuit
      Driver air bag module squib 1
      • C2041b-3
      • C2041b-4
      • RR101 (YE/GN)
      • CR101 (VT/BN)
      Driver air bag module squib 2
      • C2041b-15
      • C2041b-16
      • RR102 (WH)
      • CR102 (BU)
      Passenger air bag module squib 1
      • C2041b-1
      • C2041b-2
      • CR103 (GY/BU)
      • RR103 (VT/GN)
      Passenger air bag module squib 2
      • C2041b-5
      • C2041b-6
      • CR104 (YE/GY)
      • RR104 (WH/BU)
      Driver safety belt buckle pretensioner
      • C2041a-31
      • C2041a-32
      • CR120 (BU/OG)
      • RR120 (BN/GN)
      Passenger safety belt buckle pretensioner
      • C2041a-33
      • C2041a-34
      • RR122 (BN)
      • CR122 (WH/OG)
    • Are the resistances greater than 10,000 ohms between the affected circuits? 
    1. YES  : Go to  O3.
    2. NO  : REPAIR the affected circuits. Go to  O5 .
  3. O3 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connectors are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    • Connect: Restraint System Diagnostic Tools 418-F395 (2 required) to Driver Air Bag Module Electrical Connectors (If previously disconnected)
    • Connect: Restraint System Diagnostic Tools 418-F403 to Passenger Air Bag Module C256 (If previously disconnected)
    • Connect: RCM C2041b and C2041a
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: View and Record DTC B2792 Fault PIDs
    • Was on-demand DTC B2792 retrieved? 
    1. YES  : INSTALL a new RCM. REFER to Restraints Control Module (RCM)  in this article. Go to  O5 .
    2. NO  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. Go to  O5 .
  4. O4 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • If a cross link fault for driver air bag squib 1 or squib 2 is present continuous:
      • connect Restraint System Diagnostic Tool 418-F395 (2 required) to driver air bag module electrical connectors.
    • If a cross link fault for passenger air bag module squib 1 or squib 2 is present continuous:
      • disconnect the passenger air bag module C256.
      • connect Restraint System Diagnostic Tool 418-F403 to passenger air bag module C256.
    • If a cross link fault for driver safety belt buckle pretensioner is present continuous:
      • disconnect the driver seat harness C328.
    • If a cross link fault for passenger safety belt buckle pretensioner is present continuous:
      • disconnect the passenger seat harness C339.
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering  in this article.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
      NOTE: With the driver seat harness disconnected, open circuit faults will be retrieved for the seat track position sensor, safety belt buckle switch and safety belt buckle pretensioner.

      With the passenger seat harness disconnected, open circuit faults will be retrieved for the safety belt buckle switch, safety belt buckle pretensioner and a no communication fault with the OCS module.

    • Enter the following diagnostic mode on the diagnostic tool: View and Record DTC B2792 Fault PIDs
    • Was on-demand DTC B2792 retrieved? 
    1. YES  : This is a hard fault. The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. Go to  O2 .
    2. NO  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. Go to  O5 .
  5. O5 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous memory DTCs recorded during Step O1.
    • Were any continuous memory DTCs retrieved during Step O1? 
    1. YES  : Do not clear any DTCs until all DTCs have been resolved. Go to the Restraints Control Module (RCM) Diagnostic Trouble Code (DTC) Table in this article for pinpoint test direction.
    2. NO  : RECONNECT the system. If previously directed to deactivate the system, REACTIVATE the system. REFER to Supplemental Restraint System (SRS) Deactivation and Reactivation  in this article. REPOWER the system. REFER to Supplemental Restraint System (SRS) Depowering and Repowering  in this article. PROVE OUT the system. CLEAR all RCM and OCS module DTCs.
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