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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1193 (Supplemental Inflatable Restraint System) >> Diagnosis And Testing >> Pinpoint Tests - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test P: LFC 52/DTC B2439 - Passenger Safety Belt Buckle Switch Resistance Out Of Range >> Pinpoint Test P: LFC 52/DTC B2439 - Passenger Safety Belt Buckle Switch Resistance Out Of Range

Pinpoint Test P: LFC 52/DTC B2439 - Passenger Safety Belt Buckle Switch Resistance Out Of Range

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. 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. P1 CHECK FOR A HARD OR INTERMITTENT DTC 
    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: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow these instructions may result in the inadvertent deployment of the safety canopy and risk of personal injury.
    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: After diagnosing or repairing a supplemental restraint system (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 diagnostic tool: Retrieve Continuous DTCs.
    • Retrieve and record any continuous DTCs for use later in this pinpoint test.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test.
    • Was DTC B2439 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 P2.
    • No  : This is an intermittent fault. The fault condition is not present at this time. GO to  P6.
  2. P2 CHECK CIRCUIT 178 (DG/OG) FOR AN OPEN BETWEEN THE RCM AND THE PASSENGER SAFETY BELT BUCKLE SWITCH 
    • Key in OFF position.
    • Depower the system. refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: RCM C310b.
    • Disconnect: Passenger Safety Belt Buckle Switch C3066.
    • Measure the resistance between RCM C310b pin 26, circuit 178 (DG/OG), harness side and passenger safety belt buckle switch C3066 pin 2, circuit 178 (DG/OG), harness side.
      Fig 1: Checking Circuit 178 (DG/OG) For An Open Between RCM And Passenger Safety Belt Buckle Switch
      G03932980Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    • Yes  : GO to P3.
    • No  : REPAIR circuit 178 (DG/OG). GO to  P7.
  3. P3 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN 
    • Measure the resistance between passenger safety belt buckle switch C3066 pin 1, circuit 1203 (BK/LB), harness side and ground.
      Fig 2: Measuring Resistance Between Connector And Ground
      G03946403Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    • Yes  : GO to P4.
    • No  : REPAIR circuit 1203 (BK/LB). GO to  P7.
  4. P4 CHECK THE SAFETY BELT BUCKLE SWITCH 
    • Connect: RCM C310b.
    • Install a known good passenger safety belt buckle assembly. Refer to SAFETY BELT SYSTEM .
    • Connect: Passenger Safety Belt Buckle Switch C3066.
    • 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 diagnostic tool: On-Demand Self Test.
    • Was DTC B2438 retrieved during the on-demand self test? 
    • Yes  : GO to P5.
    • No  : Fault corrected. GO to  P7.
  5. P5 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.
    • Yes  : INSTALL a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) . GO to  P7.
    • 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  P7.
  6. P6 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test.
    • Was DTC B2439 retrieved during the on-demand self test? 
    • Yes  : GO to  P2.
    • 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 P7.
  7. P7 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous DTCs recorded during Step  P1.
    • Were any continuous DTCs retrieved during Step   P1 ? 
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