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Loss Of Ignition Run - Start







LOSS OF IGNITION RUN - START





For a complete wiring diagram Consult Diagrams/Electrical.

Theory of Operation

The Occupant Restraint Controller module (ORC) receives power from both a run/start and run only ignition supply circuits. These circuits power the ORC and the capacitors used to initiate the squib deployment circuits in the event of collision detection. The OCM A21 Run/Start circuit provides battery voltage to the PDC C6 Fuse and the F12 Fused Ignition Switch Output Switch Run/Start circuit. If the voltage on the Fused Ignition Switch Output Run/Start circuit is below 6.0 volt the DTC will be set active.

- When Monitored:
With the ignition in the Run-Start position.

- Set Condition:
The Occupant Restraint Controller (ORC) monitors the voltage of the (F12) Fused Ignition Switch Output (Run-Start) circuit and will set this DTC if it drops below approximately 6.0 ± 0.25 volts.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Restraints System Pre-Diagnostic Procedure

Diagnostic Test

1. VERIFY THAT ACTIVE LOSS OF IGNITION RUN - START DTC
NOTE: Ensure that the battery is fully charged.

Turn the ignition on.
With the scan tool, read the active ORC DTC.
Does the scan tool display active ORC DTC: LOSS OF IGNITION RUN - START

Yes

- Go To 2

No

- Perform *RESTRAINTS SYSTEM INTERMITTENT TEST. Restraints System Intermittent Test

Diagnostic Test

2. VERIFY ACTIVE B2101-IGNITION RUN/START INPUT CIRCUIT LOW DTC.
With the scan tool, read OCM DTC.
Does the scan tool display an active: B2101-IGNITION RUN/START INPUT CIRCUIT LOW OCM DTC?

Yes

- Go To 3

No

- Go To 9

3. INSPECT AIRBAG RUN-START FUSE
Turn the ignition off.
Remove the PDC C6 Fuse and inspect the fuse.

NOTE: Check connectors - Clean and repair as necessary.

Is the fuse open?

Yes

- Go To 4

No

- Go To 7

4. CHECK (F12) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT RESISTANCE




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

Measure the resistance of the (F12) Fused Ignition Switch Output (Run-Start) circuit between the PDC C6 Fuse terminal (output side) and ground.
Is the resistance below 100.0 ohms?

Yes

- Go To 5

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 PDC C6 Fuse.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests.

5. CHECK (F12) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT RESISTANCE WITH OCM CONNECTOR DISCONNECTED




Disconnect the OCM C1 connector.

NOTE: Check connectors - Clean and repair as necessary.

Measure the resistance of the (F12) Fused Ignition Switch Output (Run-Start) circuit between the PDC C6 Fuse terminal (output side) and ground.
Is the resistance below 100.0 ohms?

Yes

- Go To 6

No

WARNING: If the Occupant Classification Module 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.

- Replace the OCM.
- Replace the PDC C6 Fuse.
- Perform *OCM REZERO. Testing and Inspection

6. CHECK (F12) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT RESISTANCE WITH ORC AND OCM CONNECTORS DISCONNECTED




Disconnect the ORC connectors.

NOTE: Check connectors - Clean and repair as necessary.

Measure the resistance of the (F12) Fused Ignition Switch Output (Run-Start) circuit between the PDC C6 Fuse terminal (output side) and ground.
Is the resistance below 100.0 ohms?

Yes

- Repair the (F12) Fused Ignition Switch Output (Run-Start) circuit short to ground.
- Replace the PDC C6 Fuse.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests.

No

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.

- Replace the ORC.
- Replace the PDC C6 Fuse.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests.

7. CHECK (A21) IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN




Turn the ignition on.
Measure the voltage of the (A21) Ignition Switch Output (Run-Start) circuit at the PDC C6 Fuse terminal (supply side).
Is the voltage above 6.0 ± 0.25 volts?

Yes

- Go To8

No

- Repair the open or high resistance in the Airbag Run-Start Fuse C6 (A21) Ignition Switch Output Run/Start supply circuit (input side).
- Reinstall the PDC C6 Fuse.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

8. CHECK THE (F12) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN




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.

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

Connect the Load Tool ORC 8443-25 Adaptor to the ORC connectors.

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

Measure the voltage of the (F12) Fused Ignition Switch Output (Run-Start) circuit between the ORC 8443-25 Adaptor cavity 32 way-17 and ground.
Is the voltage above 6.0 ± 0.25 volts?

Yes

WARNING: To avoid serious or fatal injury, 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 serious or fatal injury.

- Replace the ORC.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

No

- Repair the open or high resistance in the (F12) Fused Ignition Switch Output (Run-Start) circuit.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

9. CHECK (F12) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN




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

Reconnect the PDC C6 Fuse if previously disconnected.
Disconnect the ORC connectors.

NOTE: Check connectors - Clean and repair as necessary.

Connect the Load Tool ORC 8443-25 Adaptor to the ORC connectors.

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

Measure the voltage of the (F12) Fused Ignition Switch Output (Run-Start) circuit between the ORC 8443-25 Adaptor cavity 32 way-17 and ground.
Is the voltage above 6.0 ± 0.25 volts?

Yes

WARNING: To avoid serious or fatal injury, 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 serious or fatal injury.

- Replace the ORC.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

No

- Repair the open (F12) Fused Ignition Switch Output (Run-Start) circuit between the ORC splice and the OCM.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

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