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B1982 OBD-II Trouble Code: Driver's Door Unlock Relay Circuit Failure

diagnostic check engine light

B1982 code definition

A B1982 trouble code indicates that the vehicle's Engine Control Unit (ECU) has registered an unspecified failure relating to the driver's side front door's unlock relay circuit.

What the B1982 code means

The unlock relay transmits commands from a vehicle's power lock feature (such as a remote fob) to unlock the vehicle. In the case of a B1982 trouble code, the circuit meant to relay this command has suffered an unspecified failure, most likely caused by damaged or faulty wiring.

What causes the B1982 code?

A B1982 trouble code is often caused by improperly installed, damaged, faulty or otherwise problematic wiring. Damaged or loose wiring can sometimes be explained by a recent crash impact. In some rare occurrences, the ECU itself may be reporting the code falsely.

What are the symptoms of the B1982 code?

If the unlock relay circuit has failed, the driver side's lock won't be able to receive commands to unlock itself via electronic command. A remote key fob may not work properly. As a result, the B1982 may present an inconvenience to the operator, despite not technically affecting the vehicle's drivability. In addition, the B1982 trouble code will come with a stored code in the ECU and an illuminated check engine lamp. These latter symptoms are present in a purely diagnostic context, and may be disregarded as son as the specific problem has been identified.

How does a mechanic diagnose the B1982 code?

The B1982 code may be first identified by reading the ECU with an OBD-II scanner. When the issue has been pinpointed to the driver side's unlock relay circuit, the circuit should be accessed by unscrewing the access panel and inspecting the circuit accordingly for signs that could explain the circuit failure. These signs include disconnected and improperly wired circuitry, damaged, corroded or faulty wiring, and damaged, faulty or corroded components.

Common mistakes when diagnosing the B1982 code

The B1982 is a body-related (or "B-class") trouble code. Codes within this category may describe different issues depending on the type of vehicle and its manufacturer. Although your OBD-II code scanner may specify the code description for you, make sure that you don't confuse one code description for another. This can result in needless repairs for functional components, and will leave the actual problem unresolved. Refer to your vehicle manual if you're unsure.

How serious is the B1982 code?

An unreliable locking mechanism won't pose a threat to the vehicle's drivability or its safety. You can always work around it by unlocking the door manually by reaching over and opening it from the inside, or using a physical key. These simple workarounds make the B1982 code a fairly mild concern, but the lost convenience may be enough to convince operators to fix the issue promptly. Address the code at your own discretion.

What repairs can fix the B1982 code?

The wiring (along with any problematic connectors) should be rewired, repaired, or even replaced depending on the severity of the noted wiring issue. In the rare case that the ECU is faulty, it may need to be reprogrammed or replaced instead of the deflate circuit components. Once repairs for the B1982 trouble code have been finished, the vehicle should be restarted. Doing so will allow the trouble code to recur if it hasn't been properly addressed already.

Additional comments for consideration regarding the B1982 code

The process of repairing a locking mechanism will vary based on the type of lock system the vehicle is equipped with. Single wire systems are generally the easiest to repair, although more modern vehicles are typically equipped with tripe wire or even vacuum-engaged locking systems.

Need help with a B1982 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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