Restore Your Vehicle’s Electrical Functions
Are you experiencing a host of bizarre electrical issues in your Chevrolet Trailblazer, GMC Envoy, or other GM SUV? Flickering lights, malfunctioning power windows, a dead instrument cluster, or a no-start condition can often be traced back to a single culprit: a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, and when it fails, it can cause widespread and frustrating problems. This replacement Trailblazer Body Control Module is the definitive solution to restore your vehicle’s performance and reliability.
The Plug-and-Play Advantage: Programmed to Your VIN
Replacing a BCM isn’t typically a simple swap. A new module from the dealership requires expensive and time-consuming programming to sync it with your vehicle’s unique identity. We eliminate that hassle. When you order from us, we pre-program this module using your vehicle’s VIN. This means the BCM arrives at your door ready for installation, loaded with the latest software updates from GM. This service saves you a trip to the dealer and hundreds of dollars in programming fees.
From the Diagnostic Bay
We had a 2004 GMC Envoy come into the shop with a classic “haunted car” complaint. The owner said the dome lights would stay on, the radio would randomly shut off, and the power locks had a mind of their own. He had already replaced the battery and checked all the fuses. After a quick scan, we saw multiple communication loss codes pointing to the BCM. Instead of a complex wiring chase, we installed a VIN-programmed BCM. Within an hour, every single one of the ghost-like electrical issues was gone. It’s a reminder that when multiple, unrelated electronic systems act up, the BCM should be the first suspect.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-functional power windows, door locks, and mirrors.
- ✔ Erratic instrument cluster behavior, with gauges dropping to zero or warning lights flashing.
- ✔ Interior or exterior lights that won’t turn on or off.
- ✔ Malfunctioning security system or remote keyless entry.
- ✔ A/C and climate control system not responding correctly.
- ✔ Vehicle failing to start, even with a good battery and starter.
- ✔ Communication error codes (U-codes) stored in the vehicle’s computer system.
Installation and Post-Install Procedures
Installation is straightforward for a DIY mechanic with basic tools. The BCM is typically located on or near the interior fuse panel. After swapping the module, there are a couple of potential procedures that may be required, depending on your specific vehicle’s configuration.
- Airbag System Sync: If your airbag warning light is illuminated after installation, a professional scan tool is needed to perform the “Setup SDM Primary Key in BCM” procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor recalibration may be necessary to ensure proper brake light and traction control operation.
There is no core charge for this module. You can keep your original part.
Guaranteed Fitment for Your GM SUV
This replacement Trailblazer Body Control Module is a direct fit for a wide range of vehicles and is compatible with the following part numbers: 15122670, 15065293, 15114669, 15191621, and 9352135. It is designed for models including the Chevrolet Trailblazer, GMC Envoy, Oldsmobile Bravada, Buick Rainier, Isuzu Ascender, and Saab 9-7X from 2002 to 2005. Please verify your part number and check the fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to get this BCM programmed by a dealer?
No. We handle all the programming before we ship the part to you. Simply provide your vehicle’s VIN during or after checkout, and the module will arrive ready for installation.
What is a BCM and what does it do?
The Body Control Module (BCM) is a computer that manages and controls many of your vehicle’s non-engine related electronic features, such as power windows, locks, lights, wipers, and the security system.
Is this a difficult part to install myself?
For someone with basic mechanical skills, the installation is manageable. The BCM is usually located near the interior fuse box. The main challenge is often accessing it. However, the process itself is just unplugging the old one and plugging in the new one.
What happens if my airbag light comes on after installation?
This is a known possibility. It means the new BCM needs to be electronically introduced to the airbag module (SDM). This requires a bi-directional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. A local repair shop can typically perform this for you.
Do I need to send my old BCM back?
No, there is no core charge or requirement to return your original module. You can keep it or dispose of it.