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B1843 OBD-II Trouble Code: Wiper Front Power Circuit Short to Ground

diagnostic check engine light

B1843 code definition

The B1843 trouble code signals an error with the wiper front power circuit.

What the B1843 code means

The B1843 code is a generic OBD-II trouble code that detects a wiper front power circuit malfunction. If the body control module or the powertrain control module (PCM) receive an abnormal voltage reading from the wiper front power circuit, then the B1843 trouble code will likely be triggered.

What causes the B1843 code?

Potential causes of the B1843 trouble code include:

  • Open or short wiper front power circuit
  • Blown fuse
  • Damaged wires or connectors
  • Defective front power wiper switch
  • Faulty front power wiper motor

What are the symptoms of the B1843 code?

When the B1843 trouble code is detected, the power windshield wipers will likely not work properly. This may mean that the speed of the wipers cannot be controlled, or it may mean that they will not be able to function at all.

How does a mechanic diagnose the B1843 code?

A reputable mechanic will diagnose the B1843 code using a standard OBD-II trouble code scanner. The technician will use the scanner to view the freeze frame data for the code, and to look for additional trouble codes. If there are numerous trouble codes detected, then the technician will need to diagnose them in the order in which they appear. The trouble codes will then be reset, the vehicle restarted, and the B1843 code checked for. If the code is no longer detected, then it was probably erroneously triggered, or an intermittent error.

If the code remains detected, then the technician will begin by checking the fuse associated with the front windshield wiper system. If the fuse is not blown, then the wires and connectors should be visually inspected, and the circuit should be tested. If the issue remains unresolved, the mechanic will inspect the front power wiper switch and motor.

After the mechanic makes any repairs or replacements, the trouble codes should again be reset, the vehicle restarted, and the B1843 code checked for. By doing this, the technician will know as soon as the problem is fixed.

Common mistakes when diagnosing the B1843 code

The most commonly made error when diagnosing this code comes from failing to properly follow the OBD-II diagnosis protocol. It’s very important that mechanics abide by the protocol at all times, to help ensure that diagnoses are efficient, and repairs are proper.

Functional front power wiper switches and motors are often condemned when circuitry and electrical components are overlooked.

How serious is the B1843 code?

The B1843 trouble code may keep the vehicle’s front windshield wiper system from operating. The windshield wipers are an important safety feature, and a vehicle with inoperable wipers should not be driven in rain, snow, or mist. For safety reasons, a vehicle should be inspected as soon as the B1843 code is detected.

What repairs can fix the B1843 code?

Possible repairs for the B1843 trouble code are:

Additional comments for consideration regarding the B1843 code

The B1843 code is a manufacturer specific trouble code. This means that while the code signals a front power wiper circuit malfunction in certain vehicles, it may represent a different issue in other makes. It’s important that technicians always be cognizant of the make and model of the vehicle they are working on when diagnosing the B1843 trouble code.

Need help with a B1843 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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