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B1B56






B1B56-1st ROW PASSENGER SEATBELT SENSOR CIRCUIT OPEN

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:
With the ignition on and the Occupant Restraint Controller (ORC) configured for a Passenger Seat Belt Buckle Switch. The ORC monitors the switch input current ranges at power up and continuously every 100ms with the ignition in on.

- Set Condition:
If the ORC detects the passenger seat belt buckle switch circuits have been open for 2.5 seconds. The active code will change to stored after the ORC verifies the passenger seat belt buckle switch sense circuit voltage has returned to normal voltage range for five seconds.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Testing and Inspection.

1. VERIFY ACTIVE DTC

NOTE: Make sure the battery is fully charged.

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

Does the scan tool display active B1B56-1st ROW PASSENGER SEATBELT SENSOR CIRCUIT OPEN DTC?

Yes

- Go To 2

No

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

2. CHECK (R58) PASSENGER SEAT BELT BUCKLE SWITCH SENSE CIRCUIT AND (R60) PASSENGER SEAT BELT BUCKLE SWITCH GROUND 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. Disconnect the Passenger Seat Belt Buckle Switch harness connector.
2. Disconnect the ORC harness connectors.

NOTE: Check connectors - Clean and repair as necessary.

3. Connect the SRS Load Tool Adapter to the ORC C2 harness connector.
4. Measure the resistance of the (R58) Passenger Seat Belt Buckle Switch Sense circuit between the Passenger Seat Belt Buckle Switch harness connector and the SRS Load Tool Adapter cavity 27.
5. Measure the resistance of the (R60) Passenger Seat Belt Buckle Switch Ground circuit between the Passenger Seat Belt Buckle Switch harness connector and the SRS Load Tool Adapter cavity 28.

Is the resistance greater than 1.0 Ohms on any of these circuits?

Yes

- Repair the (R58), (R60) Passenger Seat Belt Buckle Switch circuits for an open.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

No

- Go To 3

3. VERIFY OPEN SWITCH
1. Replace the Passenger Seat Belt Buckle Switch. Seat Belt Buckle - Removal.
2. Reconnect the vehicle body harness connector to the Passenger Seat Belt Buckle Switch.
3. Remove any special tools or jumper wires and reconnect all previously disconnected components - except the Battery.

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. Connect the scan tool to the Data Link Connector - use the most current software available.
5. Use the scan tool and erase the stored DTCs.
6. Turn the Ignition OFF, and wait 15 seconds before turning the Ignition ON.
7. Wait one minute, and read active DTCs and if there are none present read the stored DTCs.

Does the scan tool display active B1B56-1st ROW PASSENGER SEATBELT SENSOR CIRCUIT OPEN 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. Occupant Restraint Controller - Removal.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

No

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

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