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Home >> Jeep >> 2008 >> Liberty Limited, 4WD, Part Time >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> DTCS B1C4C To U0171 >> B212D-Ignition Run Only Input Circuit Open >> Diagnostic Test

Diagnostic Test

  1. VERIFY THAT DTC B212D-IGNITION RUN ONLY INPUT CIRCUIT OPEN IS ACTIVE 
    NOTE: Ensure the battery is fully charged.

    Turn the ignition on.

    Wait 10 seconds.

    With the scan tool, read Occupant Restraint Controller (ORC) and Occupant Classification Module (OCM) DTCs.

    Does the scan tool display active: B212D-IGNITION RUN ONLY INPUT CIRCUIT OPEN? 

    Yes 

    1. Go To  2.

    No 

    1. Go To  8.
  2. INSPECT AIRBAG RUN CIRCUIT FUSE 51 

    Turn the ignition off.

    Remove the TIPM Fuse 51 and inspect the fuse.

    NOTE: Check connectors - Clean and repair as necessary.

    Is the fuse open? 

    Yes 

    1. Go To  3.

    No 

    1. Go To  5.
  3. CHECK (F100) FUSED IGNITION SWITCH OUTPUT CIRCUIT SHORT TO GROUND 
    Fig 1: Measuring Resistance Of (F100) Fused Run Relay Output Circuit Between TIPM Fuse 51 (Output Side) Terminal And Ground
    GC0061868Courtesy of CHRYSLER LLC

    Measure the resistance of the (F100) Fused Run Relay Output circuit between the TIPM Fuse 51 (output side) terminal and ground.

    Is the resistance below 100.0 ohms? 

    Yes 

    1. Go To  4.

    No 

    1. Using the wiring diagram/schematic as a guide, inspect the related wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
    2. Replace TIPM Fuse 51.
    3. Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .
  4. CHECK (F100) FUSED IGNITION SWITCH OUTPUT CIRCUIT RESISTANCE WITH ORC DISCONNECTED 
    Fig 2: Measuring Resistance Of (F100) Fused Run Relay Output Circuit Between TIPM Fuse 51 (Output Side) Terminal And Ground
    GC0061868Courtesy of CHRYSLER LLC
    WARNING: If the Occupant Restraint Controller is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment and serious or fatal injury.
    WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

    Disconnect the ORC connectors.

    NOTE: Check connectors - Clean and repair as necessary.

    Connect the Load Tool ORC 8443-32 Adapter to the ORC connectors.

    Measure the resistance of the (F100) Fused Run Relay Output circuit between 8443-32-R Adapter cavity C2-31 and ground.

    Is the resistance below 100.0 ohms? 

    Yes 

    1. Repair the (F100) Fused Run Relay Output (Run) circuit for a short to ground.
    2. Replace the TIPM Fuse 51.
    3. Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .

    No 

    1. Replace the ORC in accordance with the Service Information.
    2. Replace the TIPM Fuse 51.
    3. Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .
  5. CHECK TIPM FUSE 51 SUPPLY SIDE CIRCUIT VOLTAGE 
    Fig 3: Measuring Voltage Of TIPM Fuse 51 (Supply Side) Of Fuse To Ground
    GC0061869Courtesy of CHRYSLER LLC

    Turn the ignition on.

    Measure the voltage of the TIPM Fuse 51 (supply side) of the fuse to ground.

    Is the voltage above 6.0 volts? 

    Yes 

    1. Go To  6.

    No 

    1. Replace the TIPM in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  6. CHECK (F100) FUSED RUN RELAY OUTPUT CIRCUIT FOR AN OPEN CIRCUIT 
    Fig 4: Measuring Voltage Of (F100) Fused Run Relay Output (Run) Circuit Between 8443-32-R Adapter Cavity C2-31 And Ground
    GC0061870Courtesy of CHRYSLER LLC
    WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

    Reinstall the TIPM Fuse 51.

    Disconnect the ORC connectors.

    NOTE: Check connectors - Clean and repair as necessary.

    Connect the Airbag Load Tool ORC 8443-32-R Adapter to the ORC harness connectors.

    WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.

    Measure the voltage of the (F100) Fused Run Relay Output (Run) circuit between the 8443-32-R Adapter cavity C2-31 and ground.

    Is the voltage above 6.0 volts? 

    Yes 

    1. Replace the ORC in accordance with the Service Information.
    2. Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .

    No 

    1. Go To  7.
  7. CHECK FUSE 51 OUTPUT TO CAVITY 38 OF THE TIPM C6 CONNECTOR 
    Fig 5: Measuring Resistance Of (F100) Fused Run Relay Output (Run) Circuit Between 8443-32-R Adapter Cavity C2-31 And TIPM C6 Connector Cavity 38
    GC0061871Courtesy of CHRYSLER LLC
    WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

    Disconnect the TIPM C6 connector.

    NOTE: Check connectors - Clean and repair as necessary.

    Measure the resistance of the (F100) Fused Run Relay Output (Run) circuit between the 8443-32-R Adapter cavity C2-31 and TIPM C6 connector cavity 38.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the ORC in accordance with the Service Information.
    2. Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .

    No 

    1. Replace the TIPM in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  8. TEST FOR INTERMITTENT CONDITION 

    With the scan tool, record and erase all DTCs from all Airbag modules.

    If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.

    WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

    Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.

    The following additional checks may assist you in identifying a possible intermittent problem.

    Reconnect any disconnected components and harness connector.

    WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.

    With the scan tool, monitor active codes as you work through the following steps.

    WARNING: To avoid serious or fatal injury, maintain a safe distance from all airbags while performing the following steps.

    Wiggle the wiring harness and connectors of the related airbag circuit or component.

    If only stored codes return, continue the test until the problem area has been isolated.

    In the previous steps you have attempted to recreate the conditions responsible for setting the active DTC in question.

    Does the scan tool display any ACTIVE DTCs? 

    Yes 

    1. Select appropriate symptom from Symptom List.

    No 

    1. No problem found. Erase all codes before returning vehicle to customer.
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