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B1954 OBD-II Trouble Code: Seat Front Up/Down Potentiometer Feedback Circuit Failure

diagnostic check engine light

B1954 code definition

A B1954 trouble code indicates that the vehicle's Engine Control Unit (ECU) has detected a circuit failure related to one of the front seat's seat potentiometers.

What the B1954 code means

The seat potentiometer is a small black box, located underneath the seats of modern vehicles. It feeds data to the Engine Control Unit (ECU) regarding the seat's relative position in the vehicle, allowing to failsafe against potential conflicts with other car features, such as a convertible roof. If a seat potentiometer circuit has failed, it will rob the ECU of this information. This can result in the seat position freezing (if it's moved electronically) and will disable seat placement failsafes in the vehicle.

What causes the B1954 code?

If the circuit has failed, a faulty seat potentiometer is the most common offender. Broken, disconnected and/or faulty wiring is another potential cause for this issue. The vehicle's Engine Control Unit (ECU) may be reporting the B1952 code incorrectly in some rare circumstances. If the ECU is diagnosed as faulty, it will be due for replacing or reprogramming.

What are the symptoms of the B1954 code?

If a seat potentiometer system isn't working, there's a risk of conflict between the seat and other car features, such as a retractable roof. In some cases, the seat may even be locked in place until the code is fixed. In addition, a stored B1954 trouble code and illuminated check engine light will be present in the event of this code. These will be active for the helpful sake of accurately diagnosing the issue.

How does a mechanic diagnose the B1954 code?

A B1954 trouble code may be first diagnosed by scanning the vehicle with an OBD-II code scanner. The seat potentiometer circuit may be accessed by prying open the seat's side panel. Check the seat potentiometer for signs of fault or damage. All wiring related to the seat potentiometer in question should be inspected thoroughly for signs of wear, damage, disconnection or faultiness.

Common mistakes when diagnosing the B1954 code

Body-related trouble codes describe different problems depending on the specific make and model of vehicle in question. Make sure you are interpreting the trouble code correctly before moving on with any repairs.

How serious is the B1954 code?

A B1954 code should not have a significant impact on a vehicle's drivability, unless it has been cited alongside other, more problematic codes. If the convertible roof's contact failsafe is merely disabled, it can be worked around provided manual care is taken to ensure different parts don't conflict with each other. If the seat position is frozen however, it may cause drivability issues depending on where the seat has been locked.

What repairs can fix the B1954 code?

The seat potentiometer should be replaced if tests have determined it to be faulty. Any wiring or electrical components related to the seat pot circuit that have been detected as problematic should be repaired or replaced as well. Following any repairs made to fix the B1954 code, the vehicle should be tested again. When the car is turned on, a still-broken seat potentiometer will report the code again. This will allow you to tell whether or not the issue has been properly solved.

Additional comments for consideration regarding the B1954 code

A seat potentiometer is commonly referred to by mechanics as a "seat pot".

Need help with a B1954 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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