Codes This Page Will Cover
- B2320 Mirror Driver Horizontal Feedback Potentiometer Circuit Failure
- B2321 Mirror Driver Horizontal Feedback Potentiometer Circuit Open
- B2322 Mirror Driver Horizontal Feedback Potentiometer Circuit Short to Battery
- B2323 Mirror Driver Horizontal Feedback Potentiometer Circuit Short to Ground
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What Is the B2320 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
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The B2320 code, and its related codes of B2321-B2323, all deal with your car’s exterior door mirrors and the electrical systems that operate them. These codes trigger when there is a lapse or failure in communication between the Driver Door Module (DDM) and the vehicle’s mirror controls.
The DDM is a system that controls the left exterior mirror motor and its movement by giving the right power and ground to its circuits. The DDM frequently communicates with the Driver Seat Module (DSM) by way of the Medium-Speed Controller Area Network (MS-CAN). The exterior mirror control switch gives the DDM the input signal for the left exterior mirror and that is how it moves. The DSM, just like the DDM, does the same thing but it is controlling the right mirror motor movement by supplying the right power and ground.
What Else Should I Know About The B2320 Code?
The B2320 and its related codes deal with the memory mirror system and its use of feedback potentiometers. Feedback potentiometers are variable resistors that are used in linear actuators, like automatic window applications, and provide positional feedback based on how their resistance changes. They’re needed to ensure that the actuator doesn’t overextend and crack the mirror if the stroke length is too long to fit.
The DDM supplies the left and right mirror potentiometer with the right reference voltage and ground through circuits. This moves the mirrors to their desired location as you press the switch to adjust them. Whenever this circuit is disrupted or faulty, the B2320 and its related codes will appear to show that there is an issue. The differences in the codes lie in what exactly caused the circuit failure, with B2321 meaning that the circuit is open and B2322 and B2323 identifying the issue as a circuit short to the battery and ground, respectively.
What Are the Symptoms of a B2320 Code?
The common symptom you will find with the B2320 and its related codes is the loss of power function of your exterior mirrors. Essentially, you will lose the ability to adjust your mirrors with the interior controls to the position that you desire. You may also lose the function of the memory features of your car that remember and store the desired mirror positions.
What Are Some Causes of a B2320 Code?
The most common cause of a B2320 code is a defective driver exterior mirror. Most electronic sensors and systems have harnesses that hold the sensor in place. This is also a possible cause of the related codes triggering, especially if they’re open or shorted. A poor electrical connection in the circuit leading to the mirror is also a possible cause since it will create abnormal voltage levels. Once these abnormal levels are read by the MS-CAN, a related code will trigger. The driver exterior mirror control switch is also known to cause the code to appear and should be taken into account when diagnosing the issue. And, lastly, a defective or broken DDM or DSM will trigger the B2320 and its related codes since the systems will lose the ability to communicate with the exterior mirrors.
Can I Still Drive with a B2320 Code?
The B2320 or its related codes trigger because there’s an issue with the car’s exterior door mirrors and the electrical systems that operate them. it wouldn’t affect the driveability of a vehicle. But, as we said, if the mirrors are set to an uncomfortable position, you should be cautious with your driving so that you don’t merge into any vehicles in traffic. This can be potentially hazardous if it isn’t addressed since you essentially need your mirrors to operate properly if you are to drive your vehicle regularly.
How Easy Is It to Diagnose a B2320 Code?
The diagnostic process is relatively straightforward when dealing with a B2320 and its related codes as it requires checking the left exterior mirror jumper harness. The jumper harness is located between the vehicle harness and the exterior mirror motors and a qualified technician should examine it for any open or shorted circuits. They should also look for any damaged or pushed-out pins to make sure they are diagnosing the issue properly. For the B2322 code, it is also important to inspect the battery and the circuit leading to the battery. A qualified technician can do this with a voltage meter to ensure that the voltage levels are at the factory levels.
How Difficult Is It to Inspect a B2320 Code?
Since the diagnostic process involves checking wiring harnesses and circuit levels, this is something that is best left to a technician that is experienced. If your technician sees that the issue is with the jumper harness of the exterior mirror, then repairing the harness will be in order. If it can’t be repaired, then you will need to install a new exterior mirror. However, if the harness is fine, then all you will need to do is install a new exterior mirror motor. If the issue is with the DDM or DSM, then these parts need to be taken out and new ones installed in their place. Once the repair is done, the technician clears the code and runs a diagnostic test once more to make sure none of the codes show up again.
As we mentioned, since these repairs deal with exterior mirrors and wiring harnesses, this isn’t something that you want to tackle yourself. Even if you are a car enthusiast, properly fixing circuits is something that requires a lot of previous experience and training. You can inadvertently cause damage to the DSM and this can lead to other bigger electrical issues in your vehicle. For more general repair tips, visit KBB’s car repair guide.
Need Additional Help with Your B2320 Code?
To find more information on the B2320-B2323 codes and other electrical car systems, visit KBB’s code library for more vehicle resources. The more you learn about your car, the better you will be able to take care of it and keep it running longer and smoother.
If you still need an expert’s help, find a service center near you and get it checked out by a qualified technician today.
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