B1B8C
B1B8C-2B-DRIVER SEAT TRACK POSITION SENSOR-WIRES SHORTED TOGETHER
Special Tools:
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
When powered, the Occupant Restraint Controller (ORC) monitors the current on the seat track position sensor circuits 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 connectors.
- When Monitored:
The ORC monitors the status of the seat position sensor circuits continuously every 50 ms. When the system voltage is in the normal range and the sensors are configured for this vehicle.
- Set Condition:
If the module detects that the sensor circuit are shorted together with a value above I ≥ 17.1 ~ 20.5 mA, or shorted to ground with a value of < 5k Ohm for 3 seconds. This DTC transitions from active to stored, when the module sees a recovery from the short condition for greater than 4.7 seconds.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Restraint System Pre-Diagnostic Procedure.
Diagnostic Test
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?
ACTIVE DTC
- Go To 2
STORED DTC
- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. Restraint 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. Restraint System Verification Test.
No
- Go To 3
3. CHECK (R263) DRIVER SEAT POSITION SENSOR VOLTAGE CIRCUIT FOR A SHORT TO (R729) DRIVER SEAT DETECTION RETURN CIRCUIT
1. Disconnect the Driver Seat Track Position Sensor connector.
2. Disconnect the ORC C1 and C2 connectors.
NOTE: Check connectors - Clean and repair as necessary.
3. Connect the SRS Load Tool Adapter to the ORC C1 and C2 connectors. (8443-57)
4. Measure the resistance between the (R263) Driver Seat Position Sensor Voltage circuit and the (R729) Driver Seat Detection Return circuit between the SRS Load Tool Adapter cavity C1B-40 and C1B-53. (8443-57)
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 (R729) Driver Seat Detection Return circuit.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraint System Verification Test.
No
- Go To 4
4. CHECK (R263) DRIVER SEAT POSITION SENSOR VOLTAGE CIRCUIT AND (R729) DRIVER SEAT DETECTION RETURN CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance of the (R729) Driver Seat Detection Return circuit between the SRS Load Tool Adapter cavity C1B-53.
2. Measure the resistance of the (R263) Driver Seat Position Sensor Voltage circuit between the SRS Load Tool Adapter cavity C1B-40. (8443-57)
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 Driver Seat Position Sensor circuits for a short to ground.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraint System Verification Test.
No
- Go To 5
5. 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 View screen on the scan tool to perform this operation.
7. Wait one minute, and read active codes.
Did the active B1B8C-2B-DRIVER SEAT TRACK POSITION SENSOR-WIRES 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. Restraint System Verification Test.
No
- Repair is complete.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraint System Verification Test.