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B1B90






B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER







Theory of Operation

When powered, the Occupant Restraint Controller (ORC) sends a test current to the seat track position sensors to verify the integrity of the sensor and wiring. The use of the SRS Load Tool Adapter tool in the tests below provides a test point in place of the module.

- When Monitored:
The ORC monitors the status of the seat position sensor circuits continuously.

- Set Condition:
If the module detects that the sensor current is shorted together with a value above I ≥ 17.1 ~ 20.5 mA, or shorted to ground with a value of < 5K Ohm.





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 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. INSPECT DRIVER SEAT HARNESS WIRES AND CONNECTORS

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. Using the wiring diagram/schematics as a guide, inspect the Driver Seat Harness wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals, and correct pin tension.

Are any of these conditions present?

Yes

- NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if any of these conditions exist.

- Replace the Driver Seat Harness.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 3

3. VERIFY THAT THE DRIVER SEAT HARNESS IS ROUTED CORRECTLY
1. Verify that the Driver Seat Harness is routed correctly.

Is the Driver Seat Harness routed correctly?

Yes

- Go To 4

No

- Reroute the Driver Seat Harness as necessary.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

4. CHECK (R261) DRIVER SEAT POSITION SENSOR DATA CIRCUIT FOR A SHORT TO (R263) DRIVER SEAT POSITION SENSOR VOLTAGE CIRCUIT




1. Disconnect the Driver Seat Track Position Sensor connector.
2. Disconnect the ORC connectors.

NOTE: Check connectors - Clean and repair as necessary.

3. Connect the SRS Load Tool Adapter 8443-28 to the ORC connectors.
4. Measure the resistance between the (R261) Driver Seat Position Sensor Data circuit and the (R263) Driver Seat Position Sensor Voltage circuit at the SRS Load Tool Adapter 8443-28.

Is the resistance below 5K Ohms?

Yes

- 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 (R261) Driver Seat Position Sensor Data circuit for a short to the (R263) Driver Seat Position Sensor Voltage circuit.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 5

5. CHECK (R263) DRIVER SEAT POSITION SENSOR VOLTAGE CIRCUIT FOR A SHORT TO (R262) PASSENGER SEAT TRACK POSITION SENSOR SIGNAL CIRCUIT




1. Measure the resistance between the (R263) Driver Seat Position Sensor Voltage circuit and the (R262) Passenger Seat Track Position Sensor Signal circuit at the SRS Load Tool Adapter 8443-28.

Is the resistance below 5K Ohms?

Yes

- 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 (R263) Driver Seat Position Sensor Voltage circuit for a short to the (R262) Passenger Seat Track Position Sensor Signal circuit.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 6

6. CHECK (R263) DRIVER SEAT POSITION SENSOR VOLTAGE CIRCUIT FOR A SHORT TO (R60) PASSENGER SEAT BELT SWITCH RETURN CIRCUIT




1. Measure the resistance between the (R263) Driver Seat Position Sensor Voltage circuit and the (R60) Passenger Seat Belt Switch Return circuit at the SRS Load Tool Adapter 8443-28.

Is the resistance below 5K Ohms?

Yes

- 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 (R263) Driver Seat Position Sensor Voltage circuit for a short to the (R60) Passenger Seat Belt Switch Return circuit.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 7

7. CHECK (R263) DRIVER SEAT POSITION SENSOR VOLTAGE CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance of the (R263) Driver Seat Position Sensor Voltage circuit between ground and the SRS Load Tool Adapter 8443-28.

Is the resistance below 5K Ohms on either circuit?

Yes

- 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 (R263) Driver Seat Position Sensor Voltage circuit for a short to ground.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 8

8. CHECK OPERATION OF THE DRIVER SEAT TRACK POSITION SENSOR
1. Replace the Driver Seat Track Position Sensor.
2. Reconnect the vehicle body harness to the sensor.
3. 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.

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

Did the active DTC B1B90-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT SHORTED TOGETHER 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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