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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1110 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test H: LFC 42/DTC B2296 - Restraint System - Impact Sensor Fault >> Pinpoint Test H: DTC B2296 - Restraint System - Impact Sensor Fault

Pinpoint Test H: DTC B2296 - Restraint System - Impact Sensor Fault

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Always tighten the fasteners of the restraints control module (RCM) and impact sensor (if equipped) to the specified torque. Failure to do so may result in incorrect restraint system operation, which increases the risk of personal injury or death in a crash.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Do not probe any impact sensor. The impact sensor can not be tested using a multi-meter.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: Supplemental restraint system (SRS) components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS. 
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. H1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger/View and Record All B2296 Fault PIDs
      • Refer to PID list in Normal Operation to view B2296 fault PIDs.
    • Do any on-demand DTC B2296 fault PIDs indicate a fault? 
    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.

      Using the fault PIDs recorded, go to the appropriate pinpoint test step.

      For 2296_18_OD (Driver/Center Front Crash Sensor Internal Fault), INSTALL a new driver/center front impact severity sensor. REFER to Front Impact Severity Sensor . Go to  H11.

      For 2296_5_OD (Driver/Center Front Crash Sensor Communication Fault) or 2296_19_OD (Driver/Center Front Crash Sensor Mount/Communication Fault), go to  H2.

      For 2296_4_OD (Driver/Center Front Crash Sensor Circuit Short to Ground), go to  H5.

      For 2296_3_OD (Driver/Center Front Crash Sensor Circuit Short to Battery), go to  H7.

    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  H10.
  2. H2 INSPECT THE FRONT IMPACT SEVERITY SENSOR MOUNTING AND MOUNTING SURFACE 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Inspect the front impact severity sensor mounting and make sure that the retaining bolt is fully seated and tightened correctly.
    • Remove the front impact severity sensor. Refer to Front Impact Severity Sensor .
    • Visually inspect the front impact severity sensor and mounting surface for damage, corrosion or dirt.
    • Was the front impact severity sensor damaged, a significant amount of corrosion or dirt found, attached to the mounting surface incorrectly or was the impact sensor bolt not fully seated and tightened correctly? 
    1. YES  : If the front impact severity sensor was not attached to the mounting surface correctly, REINSTALL the sensor correctly and CLEAN or REPAIR the mounting surface as necessary. Go to  H11.

      If the front impact severity sensor was damaged, INSTALL a new front impact severity sensor. Go to  H11.

    2. NO  : Go to  H3.
  3. H3 INSTALL THE FRONT IMPACT SEVERITY SENSOR AND CARRY OUT THE ON-DEMAND SELF TEST 
    • Clean and repair the mounting surface as necessary.
    • Clean the front impact severity sensor mounting bolt.
    • Install the front impact severity sensor.
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger/View and Record All B2296 Fault PIDs
      • Refer to PID list in Normal Operation to view B2296 fault PIDs.
    • Do any on-demand DTC B2296 fault PIDs indicate a fault? 
    1. YES  : Go to  H4.
    2. NO  : Fault corrected. Go to  H11.
  4. H4 CHECK CIRCUITS 617 (PK/OG) AND 618 (VT/LG) FOR AN OPEN BETWEEN THE RCM AND FRONT IMPACT SEVERITY SENSOR 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: Front Impact Severity Sensor C177
    • Disconnect: RCM C310a and C310b
      • Fig 1: Checking Circuits 617 (PK/OG) & 618 (VT/LG) For An Open Between RCM & Front Impact Severity Sensor
      GF0044531Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM C310a-11, circuit 617 (PK/OG), harness side and front impact severity sensor C177-2, circuit 617 (PK/OG), harness side; and between RCM C310a-12, circuit 618 (VT/LG), harness side and front impact severity sensor C177-1, circuit 618 (VT/LG), harness side.
    • Are the resistances less than 0.5 ohm? 
    1. YES  : Go to  H8.
    2. NO  : REPAIR circuit 617 (PK/OG) or circuit 618 (VT/LG). Go to  H11.
  5. H5 CHECK CIRCUITS 617 (PK/OG) AND 618 (VT/LG) FOR A SHORT TO GROUND BETWEEN THE RCM AND FRONT IMPACT SEVERITY SENSOR 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
      • Fig 2: Checking Circuits 617 (PK/OG) & 618 (VT/LG) For A Short To Ground Between RCM & Front Impact Severity Sensor
      GF0008789Courtesy of FORD MOTOR CO.
    • Measure the resistance between front impact severity sensor C177-2, circuit 617 (PK/OG), harness side and ground; and between front impact severity sensor C177-1, circuit 618 (VT/LG), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  H6.
    2. NO  : REPAIR circuit 617 (PK/OG) or circuit 618 (VT/LG). Go to  H11.
  6. H6 CHECK CIRCUIT 617 (PK/OG) FOR A SHORT TO CIRCUIT 618 (VT/LG) BETWEEN THE RCM AND FRONT IMPACT SEVERITY SENSOR 
      Fig 3: Checking Circuit 617 (PK/OG) For A Short To Circuit 618 (VT/LG) Between RCM & Front Impact Severity Sensor
      GF0008791Courtesy of FORD MOTOR CO.
    • Measure the resistance between front impact severity sensor C177-2, circuit 617 (PK/OG), harness side and C177-1, circuit 618 (VT/LG), harness side.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  H8.
    2. NO  : REPAIR circuit 617 (PK/OG) and circuit 618 (VT/LG). Go to  H11.
  7. H7 CHECK CIRCUITS 617 (PK/OG) AND 618 (VT/LG) FOR A SHORT TO VOLTAGE BETWEEN THE RCM AND FRONT IMPACT SEVERITY SENSOR 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: Front Impact Severity Sensor C177
    • Disconnect: RCM C310a and C310b
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Key in ON position.
      • Fig 4: Checking Circuits 617 (PK/OG) & 618 (VT/LG) For A Short To Voltage Between RCM & Front Impact Severity Sensor
      GF0008788Courtesy of FORD MOTOR CO.
    • Measure the voltage between front impact severity sensor C177-2, circuit 617 (PK/OG), harness side and ground; and between front impact severity sensor C177-1, circuit 618 (VT/LG), harness side and ground.
    • Are the voltages less than 0.2 volt? 
    1. YES  : Go to  H8.
    2. NO  : REPAIR circuit 617 (PK/OG) or circuit 618 (VT/LG). Go to  H11.
  8. H8 CHECK THE FRONT IMPACT SEVERITY SENSOR 
    • Connect: RCM C310a and C310b
    • Install a known good front impact severity sensor.
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger/View and Record All B2296 Fault PIDs
      • Refer to PID list in Normal Operation to view B2296 fault PIDs.
    • Do any on-demand DTC B2296 fault PIDs indicate a fault? 
    1. YES  : Go to  H9.
    2. NO  : Fault corrected. Go to  H11.
  9. H9 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system components and the RCM electrical connectors are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Install the original sensor.
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger/View and Record All B2296 Fault PIDs
      • Refer to PID list in Normal Operation to view B2296 fault PIDs.
    • Do the original on-demand DTC B2296 fault PIDs indicate a fault? 
    1. YES  : INSTALL a new RCM and CARRY OUT programmable module installation (PMI). REFER to Restraints Control Module (RCM) . Go to  H11.
    2. NO  : In the process of diagnosing the fault, the fault condition has become intermittent. CHECK for causes of the intermittent fault in the areas previously worked in, particularly the pins and terminals of electrical connectors that were disconnected. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test.  REPAIR any intermittent wiring, terminal or connector concerns found. Go to  H10.
  10. H10 CHECK FOR AN INTERMITTENT FAULT 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger/View and Record All B2296 Fault PIDs
      • Refer to PID list in Normal Operation to view B2296 fault PIDs.
    • Do any on-demand DTC B2296 fault PIDs indicate a fault? 
    1. YES  : This is a hard fault. The fault condition is now present. The fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test.

      Using the fault PIDs recorded, go to the appropriate pinpoint test step.

      For 2296_18_OD (Driver/Center Front Crash Sensor Internal Fault), INSTALL a new driver/center front impact severity sensor. REFER to Front Impact Severity Sensor . Go to  H11.

      For 2296_5_OD (Driver/Center Front Crash Sensor Communication Fault) or 2296_19_OD (Driver/Center Front Crash Sensor Mount/Communication Fault), go to  H2.

      For 2296_4_OD (Driver/Center Front Crash Sensor Circuit Short to Ground), go to  H5.

      For 2296_3_OD (Driver/Center Front Crash Sensor Circuit Short to Battery), go to  H7.

    2. NO  : VISUALLY INSPECT the affected impact sensor and mounting surface for damage, corrosion or dirt. INSPECT the wiring, terminals and connectors for damage, corrosion or dirt. 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. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test.  REPAIR any intermittent wiring, terminal or connectors concerns found. Go to  H11.
  11. H11 CHECK FOR ADDITIONAL SRS DTCs 
    • Key in OFF position.
      WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
    • Reconnect all SRS components (if previously disconnected).
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: Clear all RCM Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/RCM
    • Are any RCM DTCs retrieved indicating a fault? 
    1. YES  : Do not clear any DTCs until all DTCs have been resolved. Go to Supplemental Restraint System (SRS) DTC Chart  for pinpoint test direction.
    2. NO  : PROVE OUT the SRS. REPAIR is complete. RETURN the vehicle to the customer.
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