Where is the BCM module?

The BCM module could refer to several different components, so its location depends on which BCM you mean: Broadcom wireless hardware, the Broadcom SoC on a Raspberry Pi, or a vehicle’s Body Control Module. There isn’t a single universal answer applicable to every device.

In this article, we explain the typical locations for each type of BCM module and how to identify them, so you can determine where yours is housed or installed.

BCM as a Broadcom wireless module in laptops and desktops

Common spots for Broadcom Wi‑Fi/Bluetooth adapters follow standard form factors and placements in consumer hardware. The exact layout varies by device, but these are the most frequently encountered configurations.

• In laptops, the BCM wireless card is usually a small PCIe or M.2 card located near the edge of the motherboard. It is often tucked under the palm rest or behind the back cover and connected to antennas with coax cables.


• In desktops, the BCM card is typically a PCIe Wi‑Fi card installed in a PCIe slot, or it can be integrated on the motherboard as part of a combined network controller.


• Some laptops and mini‑PCs use a motherboard‑integrated BCM module rather than a discrete card, in which case you’ll find the BCM chip on the main board rather than as a removable module.

In short, look for a Broadcom‑branded wireless card near the edge of the motherboard, or a small card in the laptop/desktop chassis with two antenna connectors.

BCM as Broadcom BCM SoC on Raspberry Pi boards

On Raspberry Pi devices, the BCM designation refers to the Broadcom System‑on‑Chip that serves as the main processor. This is not a separate, swappable module; it is the central chip mounted on the PCB and often cooled by a heat sink. The exact part number changes by generation:

• Pi 1 and Pi Zero family used BCM2835.


• Pi 2 and Pi 3 used BCM2836/BCM2837 respectively.


• Pi 4 uses BCM2711 (Cortex‑A72) as the main SoC.

Because the SoC is a single, integrated package mounted on the PCB, you won’t find a removable BCM module on Raspberry Pi boards. If you suspect an issue with the BCM, troubleshooting is typically done via the operating system or by replacing the entire board.

BCM as Body Control Module in vehicles

In cars, the BCM is the Body Control Module that coordinates a range of electrical systems. Its exact location depends on the make, model, and year of the vehicle. Common placements include the following:

• Under the dash on the driver’s side, often behind the fuse box or near the steering column.


• Behind the glove box or within the instrument panel on the passenger side.


• In the engine bay, mounted to the firewall or inner fender, particularly in older vehicles or trucks.


• Some SUVs place the BCM in the rear quarter panel or trunk area near the wiring harnesses.

To locate the BCM in your specific vehicle, consult the service manual or a dealer/repair shop. Do not attempt to service the module without proper guidance, as it handles critical vehicle functions.

Summary

The BCM term covers several distinct modules: a Broadcom wireless adapter, the Broadcom SoC used on Raspberry Pi boards, and a vehicle’s Body Control Module. Each type has its own typical location: wireless BCMs are usually in or around the computer chassis; the Raspberry Pi BCM SoC is the main chip on the Pi’s PCB; and the automotive BCM can be behind the dash, in the engine bay, or in another model‑specific location. Identifying the device first will guide you to the correct location and recovery steps.

How much would it cost to replace a BCM?

The total cost to replace a BCM (Body Control Module) can range from a few hundred dollars to over $1,500, with the average often falling between $600 and $1,000. The final price depends on whether you use a new or used part, the labor costs at a dealership versus an independent mechanic, and the complexity of the reprogramming required. 
Cost breakdown

• Part cost: A new BCM can range from roughly $100 to over $700, depending on the vehicle and where you purchase it (e.g., online retailers, dealership, or used from a salvage yard). Remanufactured and used options can be significantly cheaper. 
• Labor cost: This is often the most significant variable. A dealership can charge between $350 and $500 for just the labor to replace and program the module, but this can be as high as $1,000 or more, especially if the job is more complex. 
• Programming cost: The new BCM must be programmed to your specific vehicle, which can cost around $300 at a dealership, not including the part itself. This is a crucial step, and if the BCM isn't properly programmed, the vehicle may not start or function correctly. 

Factors that influence the total cost

• Vehicle make and model: Different vehicles have different BCMs, and the complexity of replacement and programming varies. 
• Part type: New parts are typically more expensive than remanufactured or used parts, though the latter may have a shorter lifespan. 
• Labor rates: Dealership labor rates are often higher than those at independent shops. 
• Programming requirements: Some BCMs require more complex programming than others. If the new BCM is not properly programmed, you may need to pay for additional labor to complete the job correctly. 

How do you know if a BCM module is bad?

You can tell a Body Control Module (BCM) is bad by observing erratic electrical component behavior, such as flickering lights or malfunctioning power windows and locks. Other signs include dashboard warning lights, rapid battery drain, problems starting the car, and communication failures between different vehicle modules. 
Electrical and accessory malfunctions 

• Lights: Headlights, tail lights, brake lights, and turn signals may flicker, not work, or come on randomly. 
• Power features: Power windows, locks, mirrors, and seats may not work correctly or operate erratically. 
• Wipers and horn: Wipers and the horn may activate or deactivate without input. 
• Security system: The car's alarm, keyless entry, and anti-theft systems may malfunction. 

Dashboard and starting issues 

• Warning lights: The check engine light or other dashboard warning lights may illuminate, sometimes with no clear reason. 
• Instrument cluster: Dials on the instrument cluster may move erratically. 
• Starting problems: The vehicle may fail to start, as the BCM can prevent the engine from starting if it doesn't recognize the key or ignition signal. 

Other signs

• Battery drain: The BCM may cause a parasitic drain, leading to a rapidly depleting battery. 
• Communication errors: A bad BCM can cause communication failures between other control modules, potentially leading to the U0140 trouble code. 
• HVAC problems: The climate control system may fail or not respond to adjustments. 

How do I reset my BCM module?

Resetting the BCM requires the module's power to be completely drained so that it loses memory, and it usually involves disconnecting the battery and draining the residual power by turning on the headlights.

Where is the BCM module located?

The Body Control Module (BCM) is typically located inside the vehicle, often behind the dashboard on the driver's side, under the center console, or behind the glove box. Its exact position varies by make and model, and it can sometimes be integrated into the fuse panel or located in the passenger-side kick panel.
 
This video shows the location of the BCM module on a Fiat: 59sElectrical Car Repair LIVEYouTube · May 27, 2022

• Behind the dashboard: The BCM is frequently found on the driver's side, near the steering column or the center console. 
• Under the center console: Another common location is underneath the center console. 
• Behind the glove box: Some vehicles, like certain BMW models, have the BCM located behind the glove box. 
• Integrated with the fuse panel: The BCM may be built into or connected to the main fuse box. 
• In the kick panel: The BCM can be found in the kick panel, often on the passenger side. 

This video shows the location of the BCM module in a 2013 BMW 5 series: 58sAuto Repair GuysYouTube · Oct 28, 2022