LOSS OF IGNITION RUN - START





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition in the Run-Start position.

  • Set Condition:

    The Occupant Restraint Controller (ORC) monitors the voltage of the (F201) Fused Ignition Switch Output (Run-Start) circuit and will set this DTC if it drops below approximately 4.5 volts. Note: this condition will also cause a No Response from the Occupant Classification module (OCM).


Possible Causes
  
(F201) FUSED IGNITION SWITCH OUTPUT (RUN-START) SHORTED TO GROUND
  
(F201) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN
  
(F944) IGNITION SWITCH OUTPUT CIRCUIT OPEN
  
JUNCTION BLOCK 36 AIRBAG RUN-START CIRCUIT FUSE OPEN
  
OCCUPANT CLASSIFICATION MODULE (OCM)
  
OCCUPANT RESTRAINT CONTROLLER (ORC)
  



Diagnostic Test

1.DETERMINE ACTIVE OR STORED DTC

NOTE: Ensure that the battery is fully charged.




Select ACTIVE or STORED DTC:

ACTIVE ORC DTC
  • Go To 2


STORED ORC DTC

2.CHECK THE AIRBAG RUN-START CIRCUIT FUSE



NOTE: Check connectors - Clean and repair as necessary.



Is the fuse open?

Yes
  • Go To 3


No
  • Go To 8

3.CHECK FOR A SHORTED (F201) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT


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




Is the resistance below 100.0 ohms?

Yes
  • Go To 4


No
  • 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. Replace the Airbag Run-Start circuit fuse.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

4.CHECKING EQUIPMENT


Is the vehicle equipped with an Occupant Classification System?

Yes
  • Go To 5


No
  • Go To 6

5.CHECK THE OCCUPANT CLASSIFICATION MODULE (OCM) FOR A SHORT TO GROUND




NOTE: Check connectors - Clean and repair as necessary.




Is the resistance below 100.0 ohms?

Yes
  • Go To 6


No
  • Go To 7

6.CHECK THE OCCUPANT RESTRAINT CONTROLLER (ORC) FOR A SHORT TO GROUND



JB F201 OHM OUTPUT R ST



NOTE: Check connectors - Clean and repair as necessary.





Is the resistance below 100.0 ohms?

Yes
  • Repair the (F201) Fused Ignition Switch Output (Run-Start) circuit for a short to ground. Replace the Airbag Run-Start circuit fuse.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.


No

  • WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and personal injury or death.

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

  • Replace the ORC in accordance with the Service Information. Replace the Airbag Run-Start circuit fuse.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

7.DETERMINE THE CORRECT REPAIR

NOTE: The Occupant Classification Module (OCM) and the Passenger Seat Bladder and Cushion Kit are the only serviceable OCS components.


  • If possible, check the vehicle's repair history.
  • The Service Kit wiring harness uses tamper resistant material on the harness connector. Inspect for the tamper resistant material on the harness connector.


Does the seat have a Bladder and Cushion Service Kit?

Yes

  • WARNING: If the Occupant Classification Module (OCM) is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and personal injury or death.

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

    NOTE: The Bladder and Cushion Kit are calibrated as an assembly. Do not disconnect the Bladder from the Cushion Kit. Service only as an assembly.

    Replace OCS Bladder and Cushion Kit in accordance with the Service information.
  • Perform SYSTEM VERIFICATION REQUIRED test.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.


No

  • WARNING: If the Occupant Classification Module (OCM) is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and personal injury or death.

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

  • Replace the OCM in accordance with the Service Information.
  • Perform SYSTEM VERIFICATION REQUIRED test.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

8.CHECK THE (F944) IGNITION SWITCH OUTPUT CIRCUIT FOR AN OPEN



JB F944 VOLTS INPUT R ST




NOTE: Reinstall the fuse after performing this test.



Is the voltage above 4.5 volts?

Yes
  • Go To9


No
  • Repair the (F944) Ignition Switch Output circuit for an open. Reinstall the Airbag Run-Start circuit fuse.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

9.CHECK THE (F201) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN


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



NOTE: Check connectors - Clean and repair as necessary.


NOTE: If not done so previously, reinstall the Airbag Run-Start circuit fuse.



WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.




Is the voltage above 4.5 volts?

Yes

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

    WARNING: If the Occupant Restraint Controller is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and personal injury or death.

    NOTE: When reconnecting Airbag System components the Ignition must be turned off and the Battery must be disconnected.

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


No
  • Repair (F201) Fused Ignition Switch Output (Run-Start) circuit for an open.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

10.CHECKING STORED OR INTERMITTENT CODES

NOTE: Diagnose and repair all active codes before diagnosing stored codes. Refer to the Table of Contents in this Section for a complete list of airbag system diagnostic procedures.



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




WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.


  • Wiggle the wiring harness and connectors of the related airbag circuit.
  • Continue the test until either a code becomes active or the problem area is isolated.



Are any ACTIVE DTCs present?

Yes
  • Select the appropriate diagnostic procedure from the Table of Contents in this section.


No
  • No problem found at this time. Erase all codes before returning the vehicle to the customer.