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B1B55






B1B55-1st ROW PASSENGER SEAT BELT SENSOR CIRCUIT HIGH





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

Theory of Operation

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 8443 in the tests below provides a test point in place of the module.

- When Monitored:
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.

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





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

1. DETERMINE ACTIVE OR STORED DTC

NOTE: Make sure the battery is fully charged.

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

Is the DTC active or stored?

ORC - ACTIVE DTC

- Go To 2

ORC - STORED DTC

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

2. CHECK FOR ADDITIONAL ACTIVE SENSOR DTCS
1. With the scan tool, read all active ORC DTCs.

Are DTCs B1B8E-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT HIGH and B1B94-PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT HIGH active?

Yes

- Repair or replace the (Z908) Ground circuit for an open.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 3

3. CHECK (R58) PASSENGER SEAT BELT SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE





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 Tensioner/Switch connector.
2. Disconnect the ORC connectors.

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

3. Connect the SRS Load Tool Adapter 8443-28 to the ORC 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. Measure the voltage of the (R58) Passenger Seat Belt Switch Sense circuit between the SRS Load Tool Adapter 8443-28 and ground.

Is there any voltage present on the circuit?

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.
NOTE: If the short is found in the Seat Harness, do not attempt to repair the Seat Harness. Replace the Seat Harness.
- Repair or replace the (R58) Passenger Seat Belt Switch Sense circuit for a short to voltage.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 4

4. CHECK (R60) PASSENGER SEAT BELT SWITCH RETURN CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the voltage of the (R60) Passenger Seat Belt Switch Return circuit between the SRS Load Tool Adapter 8443-28 and ground.

Is there any voltage present on the circuit?

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.
NOTE: If the short is found in the Seat Harness, do not attempt to repair the Seat Harness. Replace the Seat Harness.
- Repair or replace the (R60) Passenger Seat Belt Switch Return circuit for a short to voltage.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 5

5. CHECK (R58) PASSENGER SEAT BELT SWITCH SENSE 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. Measure the resistance of the (R58) Passenger Seat Belt Switch Sense circuit between the Passenger Seat Belt-Buckle Tensioner/Switch connector and the SRS Load Tool Adapter 8443-28.

Is the resistance below 1.0 Ohm?

Yes

- Go To 6

No

- NOTE: If the open is found in the Seat Harness, do not attempt to repair the Seat Harness. Replace the Seat Harness.
- Repair or replace the (R58) Passenger Seat Belt Switch Sense circuit for an open. Then, Go To 6

6. CHECK (R60) PASSENGER SEAT BELT SWITCH RETURN CIRCUIT FOR AN OPEN




1. Measure the resistance of the (R60) Passenger Seat Belt Switch Return circuit between the Passenger Seat Belt-Buckle Tensioner/Switch connector and the SRS Load Tool Adapter 8443-28.

Is the resistance below 1.0 Ohm?

Yes

- Replace the ORC.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- NOTE: If the open is found in the Seat Harness, do not attempt to repair the Seat Harness. Replace the Seat Harness.
- Repair or replace the (R60) Passenger Seat Belt Switch Return circuit for an open.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

7. CHECK OPERATION OF 1st ROW PASSENGER SEAT BELT SWITCH
1. Replace the 1st Row Passenger Seat Belt Switch.
2. Reconnect the ORC 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.

3. Connect the scan tool to the Data Link Connector - use the most current software available.
4. Use the scan tool and erase all codes in the ORC.
5. Perform ORC module reset. Access the Miscellaneous Function menu from the ORC ECU Overview screen on the scan tool to perform this operation.
6. Wait one minute, and read active codes.

Did the active B1B56-1st ROW PASSENGER SEAT BELT SENSOR CIRCUIT OPEN DTC return?

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

No

- Repair is complete.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

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