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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 909 (Supplemental Inflatable Restraint System - F250-F550) >> Diagnostic Tests >> Pinpoint Tests - Air Bag Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test D: LFC 25/DTC B1871 - Passenger Air Bag Deactivate Module Fault >> Pinpoint Test D: LFC 25/DTC B1871 - Passenger Air Bag Deactivate Module Fault

Pinpoint Test D: LFC 25/DTC B1871 - Passenger Air Bag Deactivate Module Fault

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. D1 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 B1871 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  D2 .
    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  D6 .
  2. D2 CHECK THE PAD SWITCH "ON" POSITION 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: RCM C2041
    • Place the PAD switch in the "ON" position.
      • Fig 1: Checking Switch Input
      GF0005430Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM C2041-8, circuit 1112 (WH/LB), harness side and RCM C2041-21, circuit 649 (BK/OG), harness side.
    • Is the resistance between 900 and 1100 ohms? 
    1. YES  : Go to  D3.
    2. NO  : Go to  D4.
  3. D3 CHECK THE PAD SWITCH "OFF" POSITION 
    • Place the PAD switch in the "OFF" position.
      • Fig 2: Checking Switch Input
      GF0005430Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM C2041-8, circuit 1112 (WH/LB), harness side and RCM C2041-21, circuit 649 (BK/OG), harness side.
    • Is the resistance between 400 and 600 ohms? 
    1. YES  : INSTALL and CONFIGURE a new RCM. REFER to Restraints Control Module (RCM) . Go to  D7 .
    2. NO  : Go to  D4.
  4. D4 CHECK CIRCUIT 1112 (WH/LB) FOR A SHORT TO BATTERY 
    • Disconnect: PAD Switch C2099
    • Repower the system. Do not  prove out the system at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Key in ON position.
      • Fig 3: Checking Circuit For Voltage
      GF0005431Courtesy of FORD MOTOR CO.
    • Measure the voltage between PAD C2099-6, circuit 1112 (WH/LB), harness side and ground.
    • Is the voltage less than 0.2 volt? 
    1. YES  : Go to  D5.
    2. NO  : REPAIR circuit 1112 (WH/LB). Go to  D7 .
  5. D5 CHECK CIRCUIT 1112 (WH/LB) FOR AN OPEN 
    • Key in OFF position.
    • Depower the system. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
      • Fig 4: Checking Circuit For Open
      GF0005432Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM C2041-8, circuit 1112 (WH/LB), harness side and PAD switch C2099-6, circuit 1112 (WH/LB), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new PAD switch. REFER to Passenger Air Bag Deactivation (PAD) Switch . Go to  D7 .
    2. NO  : REPAIR circuit 1112 (WH/LB). Go to  D7 .
  6. D6 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test/Retrieve and Record Continuous Memory DTCs
    • Was on-demand DTC B1871 retrieved? 
    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. Go to  D2 .
    2. NO  : CHECK for causes of intermittent faults on circuit 1112 (WH/LB). ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. Go to  D7 .
  7. D7 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous memory DTCs recorded during Step D1.
    • Were any continuous memory DTCs retrieved during Step D1? 
    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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