No Response From ORC (Occupant Restraint Controller Module)
NO RESPONSE FROM OCCUPANT RESTRAINT CONTROLLERNo Response From Occupant Restraint Controller:
POSSIBLE CAUSES
- Fused ignition switch output circuit open
- ORC ground circuit open
- SCI transmit circuit open
- SCI transmit circuit shorted to ground
- SCI transmit circuit shorted to voltage
- Occupant restraint controller
DIAGNOSTIC TEST
1. CHECK COMMUNICATION WITH OTHER MODULES
Turn the ignition on.
Using the DRB III(R), attempt to communicate with any other module.
Q: Is the DRB III(R) able to communicate with the module selected?
YES: Go to 2
NO: Perform No Response From All Modules. No Response From All Modules
2. FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
Turn the ignition off.
Disconnect the Occupant Restraint Controller (ORC) harness connector.
NOTE: Check connector - Clean/repair as necessary.
Reconnect the battery.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit at the ORC harness connector.
Q: Is the voltage above 10 volts?
YES: Go to 3
NO: Repair the Fused Ignition Switch Output circuit for an open.
WARNING: WHEN RECONNECTING AIRBAG SYSTEM COMPONENTS, THE IGNITION MUST BE TURNED OFF AND THE BATTERY MUST BE DISCONNECTED FOR TWO MINUTES.
Perform AIRBAG VERIFICATION TEST. Airbag System Verification Test
3. ORC GROUND CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the Ground circuit from the ORC harness connector to ground.
Q: Is the resistance below 5.0 ohms?
YES: Go to 4
NO: Repair the Ground circuit for an open.
WARNING: WHEN RECONNECTING AIRBAG SYSTEM COMPONENTS, THE IGNITION MUST BE TURNED OFF AND THE BATTERY MUST BE DISCONNECTED FOR TWO MINUTES.
Perform AIRBAG VERIFICATION TEST. Airbag System Verification Test
4. SCI TRANSMIT CIRCUIT OPEN
With the ignition off.
Measure the resistance of the SCI Transmit circuit from the ORC harness connector to the DLC.
Q: Is the resistance below 5.0 ohms?
YES: Go to 5
NO: Repair the SCI Transmit circuit for an open.
WARNING: WHEN RECONNECTING AIRBAG SYSTEM COMPONENTS, THE IGNITION MUST BE TURNED OFF AND THE BATTERY MUST BE DISCONNECTED FOR TWO MINUTES.
Perform AIRBAG VERIFICATION TEST. Airbag System Verification Test
5. SCI TRANSMIT CIRCUIT SHORTED TO GROUND
With the ignition off.
Measure the resistance between ground and the SCI Transmit circuit.
Q: Is the resistance above 100 kohms?
YES: Go to 6
NO: Repair the SCI Transmit circuit for a short to ground.
WARNING: WHEN RECONNECTING AIRBAG SYSTEM COMPONENTS, THE IGNITION MUST BE TURNED OFF AND THE BATTERY MUST BE DISCONNECTED FOR TWO MINUTES.
Perform AIRBAG VERIFICATION TEST. Airbag System Verification Test
6. SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
Turn the ignition on.
Measure the voltage of the SCI Transmit circuit at the ORC connector.
Q: Is the voltage below 0.5 volt?
YES: Replace the Occupant Restraint Controller.
WARNING:
- IF THE OCCUPANT RESTRAINT CONTROLLER IS DROPPED AT ANY TIME, IT MUST BE REPLACED.
- WHEN RECONNECTING AIRBAG SYSTEM COMPONENTS, THE IGNITION MUST BE TURNED OFF AND THE BATTERY MUST BE DISCONNECTED FOR TWO MINUTES.
Perform AIRBAG VERIFICATION TEST. Airbag System Verification Test
NO: Repair the SCI Transmit circuit for a short to voltage.
WARNING: WHEN RECONNECTING AIRBAG SYSTEM COMPONENTS, THE IGNITION MUST BE TURNED OFF AND THE BATTERY MUST BE DISCONNECTED FOR TWO MINUTES.
Perform AIRBAG VERIFICATION TEST. Airbag System Verification Test