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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 794 (Supplemental Restraint System) >> Diagnosis And Testing >> Pinpoint Tests - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test F: LFC 33/DTC B1879 - Driver Pretensioner Circuit Short to Ground >> Pinpoint Test F: LFC 33/DTC B1879 - Driver PRETENSIONER Circuit Short To Ground

Pinpoint Test F: LFC 33/DTC B1879 - Driver PRETENSIONER Circuit Short To Ground

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. 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 thorough Inspection and Verification  before proceeding with the Pinpoint Test.
  1. F1 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.
    CAUTION: To avoid potential damage to the restraints control module (RCM), make sure the RCM and bracket assembly is secured to the floor pan and the SRS is depowered before either disconnecting or reconnecting the RCM electrical connectors.
    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: Retrieve/Record Continuous DTCs.
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • 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 F2.
    • No  : This is an intermittent fault. The fault condition is not present at this time. GO to  F5.
  2. F2 CHECK THE DRIVER PRETENSIONER 
    • Yes  : GO to F3.
    • No  : INSTALL a new driver safety belt pretensioner. REFER to SAFETY BELT SYSTEM . GO to  F6.
  3. F3 CHECK THE DRIVER SAFETY BELT PRETENSIONER CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: RCM C310b.
    • Measure the resistance between RCM C310b pin 17, circuit 1079 (LG/RD), harness side and ground; and between RCM C310b pin 18, circuit 1080 (LG/BK), harness side and ground.
      Fig 1: Measuring Resistance Between RCM Pin 17 Harness Side And Ground
      G03891292Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to F4.
    • No  : REPAIR circuit 1079 (LG/RD) or circuit 1080 (LG/BK). GO to  F6.
  4. F4 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connector are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    • Connect: RCM C310b.
    • Connect: Driver Safety Belt Pretensioner C323.
    • 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 a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) . GO to  F6.
    • 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  F6.
  5. F5 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC B1879 retrieved during the on-demand self test? 
    • 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 on circuits 1079 (LG/RD) and 1080 (LG/BK). REPAIR any intermittent concerns found.

      If an intermittent concern was  found and repaired, GO to F6.

      If an intermittent concern was not  found and repaired, GO to  F2.

    • 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 F6.
  6. F6 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous DTCs recorded during Step  F1.
    • Were any continuous DTCs retrieved during Step   F1  ? 
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