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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (Supplemental Inflatable Restraint System -- F250-F550 Super Duty) >> Diagnosis And Testing >> Pinpoint Tests - Air Bag Supplemental Restraint System (SRS) >> Pinpoint Test G: LFC 16/DTC B1888 - Air Bag Passenger Circuit Shorted to Ground >> Pinpoint Test G: LFC 16/DTC B1888 - Air Bag Passenger Circuit Shorted To Ground

Pinpoint Test G: LFC 16/DTC B1888 - Air Bag Passenger Circuit Shorted To Ground

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 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. G1 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: Retrieve/Record On-Demand DTCs.
    • Enter the following diagnostic mode on the diagnostic tool: Retrieve/Record Continuous DTCs.
    • Was DTC B1888 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 G2.
    • No  : This is an intermittent fault. The fault condition is not present at this time. GO to  G5.
  2. G2 CHECK THE PASSENGER AIR BAG MODULE 
    • Yes  : GO to G3.
    • No  : INSTALL a new passenger air bag module. REFER to PASSENGER AIR BAG MODULE  in this article. GO to  G6.
  3. G3 CHECK CIRCUIT 607 (LB/OG) AND CIRCUIT 616 (PK/BK) FOR A SHORT TO GROUND BETWEEN THE PASSENGER AIR BAG MODULE AND RCM 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this article.
    • Disconnect: RCM C2041.
    • Disconnect: Passenger Air Bag Module Restraint System Diagnostic Tool.
      • NOTE: Do not separate or remove shorting bars from RCM C2041.
      Fig 1: Measuring The Resistance Between RCM C2041 Pin 6, Circuit 607 Harness Side And Ground; And Between RCM C2041 Pin 7, Circuit 616 Harness Side And Ground
      G03912043Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM C2041 pin 6, circuit 607 (LB/OG), harness side and ground; and between RCM C2041 pin 7, circuit 616 (PK/BK), harness side and ground
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to G4.
    • 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 circuit 607 (LB/OG) OR 616 (PK/BK). GO to  G6.

  4. G4 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  in this article.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test.
    • Was DTC B1888 retrieved during the on-demand self test? 
    • Yes  : INSTALL and CON+FIGURE a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM)  in this article. GO to  G6.
    • 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  G6.
  5. G5 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 passenger air bag module connector. REPAIR any intermittent concerns found.

      If an intermittent concern was  found and repaired, GO to G6.

      If an intermittent concern was not  found, GO to  G3.

    • No  : CHECK for causes of the intermittent short to ground 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 G6.
  6. G6 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous DTCs recorded during Step  G1.
    • Were any continuous DTCs retrieved during Step   G1 ? 
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