B212C
B212C-IGNITION RUN/START INPUT CIRCUIT OPEN
For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.
Theory of Operation
The Occupant Restraint Controller (ORC) receives power from both a Run and Run-Start Fused Ignition Switch Output circuits. These circuits power the ORC and the capacitors used to initiate the squib deployment circuits in the event of collision detection. The dual supply circuits allow fault detection on the power supply circuits.
- When Monitored:
The Occupant Restraint Controller (ORC) monitors the supply circuits and compares their voltage values at power up during the initialization process, and once every 100 ms throughout the ignition cycle.
- Set Condition:
This DTC sets when the ORC fails to detect ignition voltage or if there is less than 6 volts on the (F201) Fused Ignition Switch Output (Run-Start) circuit.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Restraints System Pre-Diagnostic Procedure.
1. VERIFY ACTIVE DTC B212C-IGNITION RUN-START INPUT CIRCUIT OPEN
NOTE: Ensure the battery is fully charged.
1. Turn the ignition on.
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 JUNCTION BLOCK RUN-START FUSE 16
1. Turn the ignition off.
2. Remove and inspect the Junction Block Run-Start Fuse 16.
NOTE: Check connectors - Clean and repair as necessary.
Is the fuse open?
Yes
- Go To 3
No
- Go To 5
3. CHECK (F201) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT RESISTANCE
1. Measure the resistance of the (F201) Fused Ignition Switch Output (Run-Start) circuit between the Junction Block Run-Start Fuse 16 terminal (output side) and ground.
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 Junction Block Run-Start Fuse 16.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
4. CHECK (F201) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT RESISTANCE WITH ORC CONNECTORS DISCONNECTED
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 SRS Load Tool Adapter 8443-25 to the ORC connectors.
3. Measure the resistance of the (F201) Fused Ignition Switch Output (Run-Start) circuit between the SRS Load Tool Adapter 8443-25 32 way cavity 17 and ground.
Is the resistance below 100.0 Ohms?
Yes
- Replace the Junction Block Run-Start Fuse 16.
- Repair the (F201) Fused Ignition Switch Output (Run-Start) circuit for a short to ground.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
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 Junction Block Run-Start Fuse 16.
- Replace the ORC.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
5. CHECK (F941) IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN
1. Turn the ignition on.
2. Measure the voltage of the (F941) Ignition Switch Output (Run-Start) circuit at the Junction Block Run-Start Fuse 16 terminal (supply side).
Is the voltage above 6.0 volts?
Yes
- Go To 6
No
- Repair the open (F941) Ignition Switch Output (Run-Start) circuit.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
6. CHECK (F201) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN
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. Reinstall the Junction Block Run-Start Fuse 16.
2. Disconnect the ORC connectors.
NOTE: Check connectors - Clean and repair as necessary.
3. Connect the SRS Load Tool Adapter 8443-25 to the ORC connectors.
WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury.
4. Measure the voltage of the (F201) Fused Ignition Switch Output (Run-Start) circuit between the SRS Load Tool Adapter 8443-25 32 way cavity 17 and ground.
Is the voltage above 6.0 volts?
Yes
- Replace the ORC.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Repair the open (F201) Fused Ignition Switch Output (Run-Start) circuit.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.