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Occupant Restraint Controller (ORC)






B212C-IGNITION RUN/START INPUT CIRCUIT OPEN

Special Tools:






For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation
The Occupant Restraint Controller module (ORC) receives power from both a fused run relay output and fused ignition switch output circuit from the Junction Block (JB). These circuits power the ORC and the capacitors used to initiate the squib deployment circuits in the event of collision detection.
- When Monitored:
With the ignition in the Run or Start position and every 100ms throughout the ignition cycle.

- Set Condition:
If voltage on the (F945) Fused Ignition Switch Output (Run-Start) circuit drops below 6.0 volts and (F929) Fused (Run Only) circuit voltage is greater then or equal to 9 volts for 15 seconds in the bussed ignition RUN position. The code will go from active to stored if the (F945) Ignition (Run-Start) circuit voltage is equal or above 6 volts for 5 seconds.





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

1. VERIFY THAT DTC B212C-IGNITION RUN/START INPUT CIRCUIT OPEN IS ACTIVE IN THE ORC

NOTE: Make sure the battery is fully charged.

1. Turn the ignition on, then off, then on again, wait 15 seconds.
2. With the scan tool, read ORC DTCs.

Does the scan tool display active: B212C-IGNITION RUN/START INPUT CIRCUIT OPEN?

Yes

- Go To 2

No

- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. . Restraints System Intermittent Condition Test

2. INSPECT JB FUSE F118 (10A) FOR AN OPEN
1. Turn the ignition off.
2. Remove the Run/Start Output Fuse F118 from the JB and inspect the fuse.

NOTE: Check connectors - Clean and repair as necessary.

Is the Run/Start Relay fuse open?

Yes

- Go To 3

No

- Go To 6

3. CHECK (F945) FUSED RUN/START RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND WITH ORC CONNECTED

WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

1. Measure the resistance of the (F945) Fused Ignition Switch Output Run/Start Relay circuit between ground and the Run-Start fuse F118 output terminal in JB.

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 Run-Start Fuse.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

4. CHECK (F945) FUSED RUN/START RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND WITH ORC DISCONNECTED
1. Disconnect the ORC harness connectors.

NOTE: Check connectors - Clean and repair as necessary.

2. Connect the (8443-28)to the ORC connectors.
3. Measure the resistance of the (F945) Fused Run/Start Relay Output circuit between ground and the output terminal side of Fuse F118 in the JB.

Is the resistance below 100.0 Ohms?

No

- WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to follow these instructions may result in possible serious or fatal injury.

- Replace the ORC. Occupant Restraint Controller - Removal.
- Replace the Run/Start Fuse F118 from the JB.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

Yes

- Go To 5

5. CHECK (F945) FUSED RUN/START RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND WITH THE INTERIOR JB DISCONNECTED
1. Disconnect the interior JB C3 harness connector.
2. Measure the resistance of the (F945) Fused Run/Start Relay Output circuit between ground and the interior JB C3 harness connector.

Is the resistance 100 ohms or less?

Yes

- Repair the (F945) Fused Run/Start Relay Output circuit for a short to ground. 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 F118 fuse.
- Perform RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Replace the JB. Junction Block - Removal. Replace the F118 fuse.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

6. CHECK VOLTAGE AT THE INPUT SIDE OF F118 FUSE CONNECTOR IN JB
1. Turn the ignition on.
2. Measure the voltage of the internal JB Relay Run/Start Output circuit between the input side of the Fuse F118 connector and ground.

Is the voltage above 6.5 volts?

Yes

- Go To 7

No

- Go To 9

7. CHECK (F945) FUSED RUN-START RELAY OUTPUT CIRCUIT VOLTAGE AT THE ORC





WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

1. Disconnect the ORC connectors.

NOTE: Check connectors - Clean and repair as necessary.

2. Connect the (8443-28) to the ORC connectors.
3. Reinstall Fuse F118 (10A) in the JB.

WARNING: Turn the ignition on then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

4. Measure the voltage of the (F945) Fused Run/Start Relay Output circuit between the (8443-28)cavity C2A - 79 and ground.

Is the voltage above 6.5 volts?

Yes

- WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment. Failure to follow these instructions may result in possible serious or fatal injury.

- WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

- Replace the ORC. Occupant Restraint Controller - Removal.
- Perform RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No
Go To 8

8. CHECK (F945) RUN/START RELAY OUTPUT CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the JB C3 harness connector.
3. Measure the resistance of the (F945) Fused Run Start Relay Output circuit between the JB C3 harness connector and the (8443-28) cavity C2A - 79

Is the resistance 10 ohms or less?

Yes

- Replace the JB. Junction Block - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Repair the (F945) Fused Run/Start Relay Output circuit for an Open. 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.
- Perform RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

9. CHECK FUSED B+ CIRCUIT(S) AT RUN/START RELAY FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Remove the Run/Start Relay from the JB.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the Fused B+ circuits in the Run/Start Relay connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Go To 10

No

- Repair the Fused B+ circuit(s) for an open circuit or high resistance.
- Perform RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

10. CHECK RUN/START RELAY CONTROL CIRCUIT OPERATION
1. With the scan tool actuate the Run/Start Relay control to ON.
2. Using a 12-volt test light connected to ground, check the Run/Start Relay Control circuit in the Run/Start Relay connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

3. With the scan tool, actuate the Run/Start Relay control to OFF.

Did the test light illuminate as described above when the control was actuated ON?

Yes

- Go To 11

No

- Go To 12

11. CHECK RUN/START RELAY CONNECTOR TERMINALS IN JB
1. Turn the ignition off.
2. Inspect the connectors where the Run/Start Relay connects to the JB.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.

Were any problems found?

Yes

- Repair as necessary.
- Perform RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Replace Run/Start Relay.
- Perform RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

12. CHECK RUN/START RELAY CONNECTOR TERMINALS IN JB
1. Turn the ignition off.
2. Inspect the connectors where the Run/Start Relay connects to the JB.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.
4. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Replace the JB. Junction Block - Removal.
- Perform RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

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