When it comes to the manufacture of vehicles, a lot is put in place. A fairly complex communication network is designed for efficient operation. This network consists of a collection of sensors, wires, and terminals that send feedback to the different electronic control modules. A good example of such a module is the body control module.
The body control module plays a crucial role in any vehicle. Hence, it is designed such that there is a reduced risk of failure. However, though rare, this module can present some serious operational issues. These are often seen as battery drain, no start condition, intermittent operation of the electronic components, and security function errors. A replacement is the best and most efficient fix for most of these issues.
This article highlights some of the troubling symptoms that may arise as a result of a problematic body control module.
The body control module is one of the electronic control modules that facilitates the proper running of vehicles. This particular module works to manage and operate several body-related functions. The exact functions that the BCM undertakes are different for every model.
However, the common functions include heating, lighting, air-conditioning, anti-theft systems, and wiper functions. Moreover, this module works to facilitate communication between various control modules. It is this communication that makes it possible to streamline further integration with the vehicle’s vital systems.
The body control module, BCM for short, plays a crucial role in supporting several comfort and safety-related functions hence contributing significantly to the value of the driver as well as his occupants.
However, this module can experience some operational issues that may lead to complete failure in extreme cases. When this happens, there are some tell-tale signs that imply issues with the BCM. Most of these are intolerable and should therefore be addressed as soon as possible.
Below are some of the common problems you are likely to experience related to the body control module.
A common symptom of BCM issues is not only repeated but also excessive drainage of the battery. This phenomenon is referred to as parasitic draw.
It is important to note that there is a certain amount of parasitic draw that is permissible, but when it comes to the draw as a result of BCM, it drains the battery completely in hours. This draw happens when the BCM strives to supply power to a certain accessory at incorrect times.
A malfunctioning body control module causes intermittent operation of different electrical functions such as wipers, lights, and horns. Others include irregular radio and door lock operation. What links them to BCM problems is when more than one symptom presents itself at a time.
More often than not, the security system in a vehicle is governed by the body control module.
Hence, it is often true to assume that the consistent issues with your vehicle’s security system are a consequence of a failing body control module. These also include issues with the passive-entry and keyless-entry functions.
The vehicle’s cluster is also always on the receiving end with a faulty body control module. Your dashboard can light up with so many warning lights. This often happens when the BCM is no longer capable of communicating with yet another vehicle’s control module like the powertrain control module, airbag control module, or the transmission control module.
Another common problem as far as the body control module is concerned is when the vehicle fails to start. In this case, the bad BCM fails to recognize the transponder chip of your key.
Another reason is that it fails to deliver the ‘start’ signal from the ignition switch hence preventing starter engagement. Furthermore, a hindered communication of the BCM with other corresponding control modules could result in starting difficulties.
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In most of the vehicles we have today, the BCM can be found under the dashboard. This is seen as a standardized location as most modules are located in this area. However, the exact location of the BCM in terms of the driver or passenger side will depend on the vehicle model in question. Sometimes accessing the BCM will require partial disassembly of the dashboard and surrounding trim.
In theory, you can drive a vehicle with a bad BCM. However, you are advised against it. BCM problems imply that the computer module is unpredictable and on the verge of failing. Hence, it is difficult to tell which of the computer’s functions will operate and which one will not at any given time. This makes it impossible to determine whether you have a safety precaution.
The exact price of a replacement body control module varies depending on the model and make of the vehicle in question. This is sole because different models have different BCMs and also the labor times to be put in the replacement. Averagely, a replacement BCM ranges from$300 to $600.
The BCM can be considered a primary module for organizational operations in your vehicle. This underscores the vital role it plays. Hence, issues with the BCM can be quite severe and require immediate attention. We have outlined some of the common symptoms of a faulty BCM so that you can make the necessary checks, inspections, repairs, or replacements.
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