LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2005 >> Focus ZX5 S, Automatic >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnosis And Testing >> Pinpoint Tests - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test R: DTC B1879 - Seat Belt Driver Pretensioner Circuit Short to Ground Fault >> Pinpoint Test R: DTC B1879 - Seat Belt Driver PRETENSIONER Circuit Short To Ground Fault

Pinpoint Test R: DTC B1879 - Seat Belt Driver PRETENSIONER Circuit Short To Ground Fault

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. R1 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.
    NOTE: After diagnosing or repairing an SRS, the restraint system diagnostic tools must be removed before operating the vehicle over the road.
    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 scan tool: On-Demand Self Test.
    • Enter the following diagnostic mode on the scan tool: Retrieve/Record Continuous DTCs.
    • Was DTC B1879 retrieved during the on-demand self test? 
    • 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  R2.
    • No  : This is an intermittent fault. The fault condition is not present at this time. GO to  R5.
  2. R2 CHECK THE DRIVER SAFETY BELT PRETENSIONER 
    • Yes  : GO to  R3.
    • No  : INSTALL a new driver safety belt pretensioner. Refer to SAFETY BELT SYSTEM . GO to  R6.
  3. R3 CHECK CIRCUIT 15S-JA33 (GN/BU) AND CIRCUIT 91S-JA33 (BK/BU) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: Restraint System Diagnostic Tool From Driver Safety Belt Pretensioner C323.
    • Disconnect: RCM C2041a and C2041b.
    • Measure the resistance between driver safety belt pretensioner C323 pin 2, circuit 91S-JA33 (BK/BU), harness side and ground; and between driver safety belt pretensioner C323 pin 1, circuit 15S-JA33 (GN/BU), harness side and ground.
      Fig 1: Checking Circuit 15S-JA33 (GN/BU) And Circuit 91S-JA33 (BK/BU) For A Short To Ground
      G03881115Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 1,000,000 ohms? 
    • Yes  : GO to  R4.
    • No  : REPAIR circuit 91S-JA33 (BK/BU) or circuit 15S-JA33 (GN/BU). GO to  R6.
  4. R4 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 Tool 418-F395 to Driver Safety Belt Pretensioner C323.
    • Connect: RCM C2041a and C2041b.
    • Repower the system. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC B1879 retrieved during the on-demand self test? 
    • Yes  : INSTALL and CONFIGURE a new RCM. Refer to RESTRAINTS CONTROL MODULE (RCM) . GO to  R6.
    • No  : CHECK for causes of the intermittent fault on the pretensioner circuits. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. GO to  R6.
  5. R5 CHECK FOR AN INTERMITTENT FAULT 
    • 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.

      CHECK for causes of the intermittent fault at or near the driver safety belt pretensioner electrical connector. REPAIR any intermittent concern found.

      If an intermittent concern was  found and repaired, GO to  R6.

      If an intermittent concern was not found and repaired, GO to  R3.

    • 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  R6.
  6. R6 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous DTCs recorded during Step  R1.
    • Were any continuous DTCs retrieved during Step R1? 
scientia non olet · About LEMON Manuals