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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1940 (Supplemental Inflatable Restraint System - F250-F550) >> Diagnostic Tests >> Pinpoint Tests - Air Bag Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test O: LFC 33/DTC B1933 - Air Bag Passenger Circuit Open >> Pinpoint Test O: LFC 33/DTC B1933 - Air Bag Passenger Circuit Open

Pinpoint Test O: LFC 33/DTC B1933 - Air Bag Passenger Circuit Open

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. 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 ON-DEMAND AND CONTINUOUS 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.
    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: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Was on-demand DTC B1933 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  O5 .
  2. O2 CHECK THE PASSENGER AIR BAG MODULE 
    1. YES  : Go to  O3.
    2. NO  : INSTALL a new passenger air bag module. REFER to Passenger Air Bag Module . Go to  O6 .
  3. O3 CHECK CIRCUIT 607 (LB/OG) AND CIRCUIT 616 (PK/BK) FOR AN OPEN BETWEEN THE PASSENGER AIR BAG MODULE AND RCM 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: RCM C2041
    • Disconnect: Passenger Air Bag Restraint System Diagnostic Tool
      • Fig 1: Checking Circuits For Open
      GF0005446Courtesy of FORD MOTOR CO.
      NOTE: By disconnecting the RCM connector, circuit 607 (LB/OG) and circuit 616 (PK/BK) of the RCM connector are shorted together with a shorting bar. Do not remove the shorting bar.
    • Measure the resistance between passenger air bag C256-3, circuit 607 (LB/OG), harness side and passenger air bag C256-1, circuit 616 (PK/BK), harness side.
    • Is the resistance less than 1.0 ohm? 
    1. YES  : Go to  O4.
    2. NO  : Due to the shorting bar feature in the electrical connector, the fault can exist in either circuit. Do not remove or defeat the shorting bar.

      REPAIR the circuit(s) as necessary. Go to  O6 .

  4. O4 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: Passenger Air Bag Module Restraint System Diagnostic Tool
    • Connect: RCM C2041
    • 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/Retrieve and Record Continuous Memory DTCs
    • Was on-demand DTC B1933 retrieved? 
    1. YES  : INSTALL and CONFIGURE a new RCM. REFER to Restraints Control Module (RCM) . Go to  O6 .
    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. ACTIVATE other systems in the same wire harness. REPAIR any intermittent concerns found. Go to  O6 .
  5. O5 CHECK FOR AN INTERMITTENT FAULT 
    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.

      CHECK for causes of intermittent fault at or near the passenger air bag module connector. REPAIR any intermittent concerns found.

      If an intermittent concern was  found and repaired, go to  O6 .

      If an intermittent concern was not  found, go to  O3 .

    2. NO  : CHECK for causes of intermittent high resistance on circuit 607 (LB/OG) and circuit 616 (PK/BK). ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. Go to  O6 .
  6. O6 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) Priority Table 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 . REPOWER the system. REFER to Supplemental Restraint System (SRS) Depowering and Repowering . PROVE OUT the system. CLEAR all DTCs.
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