Where is the BCM on a 2007 Avalanche?
The BCM, or Body Control Module, on a 2007 Chevrolet Avalanche is located behind the glove box on the passenger side of the dash, tucked into the lower dash near the HVAC plenum. Access typically requires removing the glove box and a panel or two in front of the module.
In practice, the BCM serves as a central controller for many body electrical functions—power windows, doors, interior lighting, wipers, and other convenience features. For the 2007 Avalanche, a GMT900-derived model, the BCM location is consistent with other GM trucks of the era, meaning it sits inside the cabin on the passenger side rather than under the hood. If you’re troubleshooting or planning replacement, verify by inspecting the passenger-side dash area just behind the glove box. Always refer to the manufacturer’s service manual for model-year specifics and safe disassembly instructions.
Location and access
Use this guide to understand where to look and what to expect when locating and reaching the BCM on a 2007 Avalanche. The following points describe typical physical placement and how it sits relative to surrounding components.
- The BCM is mounted inside the dash on the passenger side, just behind or near the glove box.
- It is usually housed in a black plastic module with multiple electrical connectors feeding the multiplex network.
- Access is typically gained by opening the glove box, releasing any dampers or stops, and removing a lower dash panel in front of the BCM.
- Wiring harnesses connected to the BCM run along the dash frame and HVAC area, so expect several large plugs and a firm mounting.
Knowing these cues can save time and prevent unnecessary panel removal. If the module isn’t visible after inspecting the glove box area, consult the factory service manual for your exact trim level and regional specifications.
Steps to access the BCM
Before you begin any work, ensure the ignition is off and disconnect the negative battery terminal to minimize the risk of shorts or airbag sensor issues.
- Open the glove box and empty its contents; if present, remove any stops or dampers to allow the box to drop fully.
- Gently detach or unclip the lower dash cover or front panel that sits just below the glove box to reveal the BCM area.
- Look for a black or dark-colored rectangular module with multiple electrical connectors; this is the BCM. Confirm by tracing the connectors back toward the dash harness.
- Carefully unplug the BCM’s connectors one at a time if you need to remove or replace the unit, noting the orientation of each plug for reinstallation.
- Reassemble in reverse order: reattach connectors, remount the BCM panel, close the glove box, and reconnect the battery. Test the vehicle’s basic systems to ensure proper function.
Access can vary slightly with trim level or additional hardware (such as an aftermarket radio or alarm system), so consult the service manual if you encounter unusual fasteners or if panels resist removal.
What to do if you can't find it
If, after following the above steps, the BCM still isn’t visible or you’re unsure about disassembly, contact a Chevrolet dealership or an experienced automotive technician. Some models may have minor variations in BCM placement, and a professional can confirm the exact location and handle any necessary programming or replacement safely.
Summary
Where is the BCM on a 2007 Chevy Avalanche?
The 2007 Chevy Avalanche BCM is located behind the dash, under the steering column and near the parking brake assembly. To access it, you will need to remove the lower dash panel to get to the area under the steering wheel.
This video shows how to remove the lower dash panel to access the BCM: 57sThe DIY+ ChannelYouTube · Apr 22, 2024
- Location: The BCM is behind the dashboard, under the steering column, and close to the parking brake.
- Access: You will need to remove the lower dash panel to get to the module.
How to reset a BCM Chevy?
At once let's get to the methods of resetting a BCM on a Chevrolet method. One basic battery disconnect. Let's start with the simplest. Method.
How do I tell if my BCM is bad?
You can tell if your BCM is bad by observing a variety of symptoms, such as electrical issues with lights and locks, the vehicle failing to start, erratic dashboard warning lights, and a persistent battery drain. Multiple simultaneous symptoms, especially sudden and unexplained ones, increase the likelihood of a bad BCM. Using an OBD-II scanner can help identify specific trouble codes like U0140 (Lost Communication With Body Control Module), which can confirm the diagnosis.
This video explains the symptoms of a bad BCM: 59sE H Car_net YouTube · Oct 7, 2025
Electrical and accessory malfunctions
- Lights: Interior and exterior lights (headlights, turn signals) may flicker, turn on or off randomly, or not work at all.
- Power windows and locks: Power windows may not roll up or down, and the central locking system may fail or lock/unlock erratically.
- Climate control: The air conditioning or heating system may fail to respond to adjustments or control the temperature inconsistently.
- Dashboard and gauges: The check engine light may illuminate, or gauges like the fuel gauge, speedometer, and temperature gauge may act erratically.
- Other accessories: Wipers, power seats, and other accessories may malfunction.
Starting and security problems
- Failure to start: The vehicle may fail to start, or you may encounter a "crank no start" condition.
- Security system: Issues with the factory security system, including false alarms or problems with the keyless entry and immobilizer system, can indicate a BCM failure.
Communication and power issues
- Battery drain: A bad BCM can cause a parasitic drain on the battery, causing it to discharge more quickly than it should.
- Communication failure: A common sign is communication failure between the BCM and other control modules, which can trigger multiple warning lights on the dashboard simultaneously.
You can watch this video to learn more about communication failure in cars: 59sSimple Car SolutionsYouTube · Aug 15, 2025
How to get a professional diagnosis
- Use an OBD-II scanner: A scanner can read Diagnostic Trouble Codes (DTCs). A code like U0140 is a strong indicator of a BCM issue.
- Rule out other components: Before concluding that the BCM is the problem, a mechanic should check for other potential issues. For example, if only one power window is not working, the motor or switch is more likely the culprit than the BCM.
- Seek professional help: Given that BCM issues can affect many systems and potentially prevent your car from starting, it's best to have a qualified mechanic diagnose the problem.
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
