B1B53

B1B54-1ST ROW PASSENGER SEAT BELT SENSOR CIRCUIT LOW

Special Tools:










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

Theory of Operation

When powered, the Occupant Restraint Controller (ORC) sends a test current across the Passenger Seat Belt Buckle Switch circuits every 100 ms to verify the integrity of the switch and wiring. The front seat belt switches cannot be adjusted or repaired and, if ineffective or damaged, the entire front seat belt buckle-half unit must be replaced. The airbag warning lamp will display in the instrument cluster for this fault.

- When Monitored:
When powered, the Occupant Restraint Controller (ORC) sends a test current to the belt switches to verify the integrity of the switch and wiring. The use of the SRS Load Tool Adapter tool in the tests below provides a test point in place of the module.

- Set Condition:
The ORC monitors the status of the seat belt switch circuits at power up and every 60 ms thereafter while the ignition is in on.

This DTC sets when the ORC detects the seat belt switch circuits have become shorted to ground for more than 2.5 seconds. This DTC transitions from active to stored when the module sees a recovery from the shorted to ground condition for greater than five seconds.





1. VERIFY ACTIVE DTC

NOTE: Make sure the battery is fully charged.

1. Turn the ignition on.
2. With the scan tool, read the ORC DTCs.

Does the scan tool display active B1B54-1ST ROW PASSENGER SEAT BELT SENSOR CIRCUIT LOW DTC?

Yes

- Go To 2

No

- Perform the AIRBAG SYSTEM INTERMITTENT TEST. Initial Inspection and Diagnostic Overview.

2. PASSENGER SEAT BELT SWITCH SIGNAL CIRCUIT SHORTED TO GROUND





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 Passenger Seat Belt Switch harness connector.
2. Disconnect the ORC harness connectors.

NOTE: Check harness connectors - Clean and repair as necessary.

3. Connect the SRS Load Tool Adapter to the ORC harness connectors.
4. Measure the resistance of the (R58) Passenger Seat Belt Switch Signal circuit between the appropriate terminal of the SRS Load Tool Adapter and ground.

Is the resistance below 10.0 Ohms?

Yes

- Repair or replace the (R58) Passenger Seat Belt Switch Signal circuit for a short to ground.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

No

- Go To 3

3. PASSENGER SEAT BELT SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
1. Replace the Passenger Seat Belt Switch.
2. Disconnect the SRS Load Tool Adapter.
3. Reconnect the ORC harness connectors.

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. With the scan tool, read all active ORC DTCs.

Does the scan tool display active B1B54-1ST ROW PASSENGER SEAT BELT SENSOR CIRCUIT LOW DTC?

Yes

- 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.

- 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.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

No

- The repair is complete.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.