B1B8F-Driver Seat Track position sensor circuit open

B1B8F code - while the CAN Bus ignition status is in Ignition-RUN and the modules is configured for a seat track position sensor, the Occupant Restraint Controller (ORC) check the sensor input current ranges. Set condition, this DTC may set when the ORC/SRS detects that the sensor input current is below 1 mA.

Possible causes B1B8F code:

• Driver seat harness improperly routed
• Driver seat harness wires chafed, pierced, pinched, partially broken
• Driver seat harness connector terminals broken, bent, pushed out, spread, corroded, contaminated
• Driver seat position sensor signal circuit shorted to voltage
• Driver seat position sensor supply circuit shorted to voltage
• Driver seat position sensor signal circuit short to the driver seat position sensor supply circuit
• Driver seat track position sensor
• Occupant Restraint Controller (ORC) / Airbag Module

Diagnose code B1B8F-Driver seat track position sensor circuit open

Step 1. Check for active internal faults, ignition faults, and battery faults in the Occupant Restraint Controller (ORC/SRS)

With the scan tool, read ORC active DTC.

Does the scan tool display any active DTC relating to internal faults, ignition faults, or battery faults ?

Yes, refer to Sitemap/Labels-DTC B Codes (SRS/ORC) and perform the appropriate diagnostic procedure.

No, go to step 2.

Step 2. Verify that DTC B1B8F-Driver seat Track position sensor circuit open active

Does the scan tool display active B1B8F-Driver seat track position sensor circuit open DTC ?

Yes, go to step 3.

No, go to step 8.

Step 3. 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.

Using the wiring diagram/schematic 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.

Are any of these conditions present ?

Yes,

Note : Do not attempt to repair the seat harness. Replace the seat harness if the condition inspecting or testing for is present in the seat harness.

Replace the Driver seat harness.

No, go to step 4.

Step 4. Verify that Driver seat harness is routed correctly

Verify that the Driver seat harness is routed correctly.

Is the Driver seat harness routed correctly ?

Yes, go to step 5.

No, reroute the Driver seat harness as necessary.

Step 5. Check for DTC B1B8F-Driver seat track position sensor circuit open with driver seat track position sensor disconnected

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.

Disconnect the Driver seat track position sensor connector.

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.

Wait two minutes, and then with the scan tool, read ORC DTC.

Does the scan tool display B1B8F-Driver Seat Track Position sensor circuit open ?

Yes, go to step 6.

No,

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 Driver seat traction sensor.

Step 6. Check Driver seat position sensor signal circuit and Driver seat position sensor supply 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.

Disconnect 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.

Measure the voltage of the Driver seat position sensor signal circuit between the Driver seat track position sensor connector and ground. Measure the voltage of the Driver seat position sensor supply circuit between the Driver seat track position sensor connector and ground.

Is the voltage above 0.02 of a volt on either circuit ?

Yes,

Note : Do not attempt to repair the seat harness. Replace the seat harness if any of these conditions exist.

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 Driver seat harness.

No, go to step 7.

Step 7. Check Driver seat position sensor signal circuit for a short to Driver seat position sensor supply circuit

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.

Measure the resistance between the Driver seat position sensor signal circuit and the Driver seat position sensor supply circuit in the Driver seat track position sensor connector.

Is the resistance below 10k Ohms ?

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.

No,

Warning : If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replace. Failure to follow these instructions may result in possible serious or fatal injury.

Replace the Occupant Restraint Controller (ORC) / Airbag Module. Peform the Airbag system verification.

Step 8. Test for an intermittent condition
With the scan tool, record and erase all DTC from the ORC. If any active codes are present they must be resolved before diagnosing any stored codes.

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.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated  terminals. The following additional checks may assist you in identifying a possible intermittent problem. Reconnect any disconnected components and harness connector.

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.

With the scan tool monitor active codes as you work through the following steps.

Warning : Maintain a safe distance from all airbags while performing the following steps. Failure to follow these instructions may result in possible serious or fatal injury.

Wiggle the wiring harness and connectors of the related airbag circuit or component. If only stored codes return continue the test until the problem area has been isolated. In the previous steps you have attempted to recreate the conditions responsible for setting active DTC in question.

Are any active DTC present ?

Yes, refer to Sitemap/Labels-DTC B Codes and perform the appropriate diagnostic procedure.

No, no problem found at this time. Erase all codes before returning the customer.

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