B1C4A 1ST Row Passenger Retractor Pretensioner Circuit Shorted Together

B1C4A Code - With the ignition on, the Occupant Restraint Controller (ORC) monitors the resistance of the passanger seat belt retractor tensioner circuits. The ORC has detected low resistance between the passenger seat belt retractor tensioner circuits.

Possible causes B1C4A code:
- passenger seat belt retractor tensioner line 1 circuit shorted to the passenger seat belt retactor tensioner line 2 circuit
- Passanger seat belt retractor tensioner
- Occupant Restraint Controller (ORC)

Diagnostic test B1C4A code

Step 1. Select active or stored DTC

Make sure the battery is fully charged.
With the scan tool, read the active ORC DTC

Is the DTC active or stored?

Active, go to step 2.
Stored, go to step 4.

Step 2. Check for shorted passenger seat belt retractor tensioner

Turn the ignition off, disconnect the 12volt battery and wait two minutes before proceeding.
Disconnect the passenger seat belt tensioner connector.
Turn the ignition then reconnect the 12volt battery and wait two minutes before proceeding.
With the scan tool, read the active ORC DTC.

Does the scan tool display B1C4A?

Yes, go to step 3.
No, replace the passenger seat belt retractor tensioner.

Step 3. Check passenger seat belt retractor tensioner line 1 circuit for a short to passenger seat belt retractor tensioner line 2 circuit

Turn the ignition off, disconnect the 12volt battery and wait two minutes before proceeding.
Disconnect the ORC connectors, check connectors clean and reapir as necessary.

Measure the resistance between the passenger seat belt retractor tensioner line 1 circuit and the passenger seat belt retractor tensioner line 2 circuit at the passenger seat belt retractor tensioner connector.

Is the resistance below 10k Ohms?

Yes, repair the passenger seat belt retractor tensioner line 1 circuit for short to the passenger seat belt retractor tensioner line 2 circuit.

No, if the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Replace the ORC and perform the Airbag system verification.

Step 4. Stored DTC

With the scan tool record and erase all DTC from all airbag system modules.
If any active codes are present they must be resolved before diagnosing any stored codes.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

Are any active DTC present?

Yes, refer to DTC based diagnostic ORC and performa the appropriate diagnostic procedure.
No, no problem found at this time. Erase all codes before returning vehicle to customer.

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