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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1110 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test E: DTC B1057 - Driver Air Bag Cross Link to Another Firing Loop >> Pinpoint Test E: DTC B1057 - Driver Air Bag Cross Link To Another Firing Loop

Pinpoint Test E: DTC B1057 - Driver Air Bag Cross Link To Another Firing Loop

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Always wear eye protection when servicing a vehicle. Failure to follow this instruction may result in serious personal injury.
WARNING: Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
WARNING: Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious personal injury or death.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: Supplemental restraint system (SRS) components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS. 
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. E1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Was on-demand DTC B1057 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.

      For DTC B1057 (Driver Air Bag Cross Link to Another Firing Loop) and DTC:

      B1048 (Passenger Side Air Bag Cross Link to Another Firing Loop), go to  E2.

      B1049 (Passenger Seatbelt Pretensioner Cross Link to Another Firing Loop), go to  E3.

      B1054 (Driver Seatbelt Pretensioner Cross Link to Another Firing Loop), go to  E4.

    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  E6.
  2. E2 CHECK RESISTANCE BETWEEN THE DRIVER AIR BAG MODULE CIRCUITS AND PASSENGER AIR BAG MODULE CIRCUITS 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: RCM C310a and C310b
    • Remove the driver air bag module. Refer to Driver Air Bag Module .
    • Disconnect: Passenger Air Bag Module C256
      • Fig 1: Checking Resistance Between Driver Air Bag Module Circuits & Passenger Air Bag Module Circuits
      GF0016769Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM:
      • C310a-3, circuit 615 (GY/WH), harness side and RCM C310a-1, circuit 607 (LB/OG), harness side.
      • C310a-4, circuit 614 (GY/OG), harness side and RCM C310a-1, circuit 607 (LB/OG), harness side.
      • C310a-3, circuit 615 (GY/WH), harness side and RCM C310a-2, circuit 616 (PK/BK), harness side.
      • C310a-4, circuit 614 (GY/OG), harness side and RCM C310a-2, circuit 616 (PK/BK), harness side.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E5.
    2. NO  : REPAIR the affected circuits. Go to  E7.
  3. E3 CHECK RESISTANCE BETWEEN THE DRIVER AIR BAG MODULE CIRCUITS AND PASSENGER SAFETY BELT BUCKLE PRETENSIONER CIRCUITS 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: RCM C310a and C310b
    • Remove the driver air bag module. Refer to Driver Air Bag Module .
    • Disconnect: Passenger Safety Belt Buckle Pretensioner C3135
      • Fig 2: Checking Resistance Between Driver Air Bag Module Circuits & Passenger Safety Belt Buckle Pretensioner Circuits
      GF0044518Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM:
      • C310a-3, circuit 615 (GY/WH), harness side and RCM C310b-33, circuit 1082 (LB/BK), harness side.
      • C310a-4, circuit 614 (GY/OG), harness side and RCM C310b-33, circuit 1082 (LB/BK), harness side.
      • C310a-3, circuit 615 (GY/WH), harness side and RCM C310b-34, circuit 1081 (YE/RD), harness side.
      • C310a-4, circuit 614 (GY/OG), harness side and RCM C310b-34, circuit 1081 (YE/RD), harness side.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E5.
    2. NO  : REPAIR the affected circuits. Go to  E7.
  4. E4 CHECK RESISTANCE BETWEEN THE DRIVER AIR BAG MODULE CIRCUITS AND DRIVER SAFETY BELT BUCKLE PRETENSIONER CIRCUITS 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: RCM C310a and C310b
    • Remove the driver air bag module. Refer to Driver Air Bag Module .
    • Disconnect: Driver Safety Belt Buckle Pretensioner C3338
      • Fig 3: Checking Resistance Between Driver Air Bag Module Circuits & Driver Safety Belt Buckle Pretensioner Circuits
      GF0044519Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM:
      • C310a-3, circuit 615 (GY/WH), harness side and RCM C310b-31, circuit 1079 (LG/RD), harness side.
      • C310a-4, circuit 614 (GY/OG), harness side and RCM C310b-31, circuit 1079 (LG/RD), harness side.
      • C310a-3, circuit 615 (GY/WH), harness side and RCM C310b-32, circuit 1080 (LG/BK), harness side.
      • C310a-4, circuit 614 (GY/OG), harness side and RCM C310b-32, circuit 1080 (LG/BK), harness side.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E5.
    2. NO  : REPAIR the affected circuits. Go to  E7.
  5. E5 CONFIRM THE RCM FAULT 
    • Connect: RCM C310a and C310b
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • DIAGNOSTIC TIP:  When viewing on-demand DTCs and fault PIDs with SRS components disconnected, open circuit faults would normally be retrieved.
    • Was on-demand DTC B1057 retrieved? 
    1. YES  : INSTALL a new RCM and CARRY OUT programmable module installation (PMI). REFER to Restraints Control Module (RCM) . Go to  E7.
    2. NO  : In the process of diagnosing the fault, the fault condition has become intermittent. CHECK for causes of the intermittent fault in the areas previously worked in, particularly the pins and terminals of any electrical connectors that were disconnected. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test.  REPAIR any intermittent wiring, terminal or connector concerns found. Go to  E6.
  6. E6 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Remove the driver air bag module. Refer to Driver Air Bag Module .
    • If DTC B1048 is also present continuous, disconnect the passenger air bag module C256.
    • If DTC B1049 is also present continuous, disconnect the passenger safety belt buckle pretensioner C3135.
    • If DTC B1054 is also present continuous, disconnect the driver safety belt buckle pretensioner C3338.
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Was on-demand DTC B1057 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.

      For DTC B1057 (Driver Air Bag Cross Link to Another Firing Loop) and DTC:

      B1048 (Passenger Side Air Bag Cross Link to Another Firing Loop), go to  E2.

      B1049 Passenger Seatbelt Pretensioner Cross Link to Another Firing Loop), go to  E3.

      B1054 (Driver Seatbelt Pretensioner Cross Link to Another Firing Loop), go to  E4.

    2. CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test.  REPAIR any intermittent wiring, terminal or connectors concerns found. Go to  E7.
  7. E7 CHECK FOR ADDITIONAL SRS DTCs 
    • Key in OFF position.
      WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
    • Reconnect all SRS components (if previously disconnected).
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: Clear all RCM Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/RCM
    • Are any RCM DTCs retrieved indicating a fault? 
    1. YES  : Do not clear any DTCs until all DTCs have been resolved. Go to Supplemental Restraint System (SRS) DTC Chart  for pinpoint test direction.
    2. NO  : PROVE OUT the SRS. REPAIR is complete. RETURN the vehicle to the customer.
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