Auto Light Control Module Location
For the 2010–2013 Mazda 3 (which falls within your 2009–2014 interest range), the “Auto Light Control Module” (often referenced by part numbers like BBM2-67-890 or BBM4-67-890) is typically integrated into the vehicle’s electrical system, often located behind the dashboard near the passenger side footwell/kick panel area or near the main body control module (BCM).
Key Information for DIY Repair
- Module Identification: Unlike a simple sensor, this is a computer module. If you are replacing it, be aware that these units often require specialized equipment to program or “marry” the module to your specific vehicle’s VIN and security system. Simply plugging in a used unit from a salvage yard may not work without a dealer or a high-end diagnostic tool.
- The “Auto” Sensor vs. Module: Do not confuse the Auto Light Control Module with the Ambient Light Sensor. The light sensor itself—which tells the system when it’s dark outside—is typically a small, dome-shaped sensor located on the top of the dashboard near the windshield defrost vents. If your “Auto” feature isn’t working, it is more often a failed dashboard light sensor or a steering column switch issue than a failure of the control module itself.
- Accessing the Area: If you are determined to reach the module, you will generally need to remove the lower trim panels on the passenger side. Always disconnect the battery before unplugging any electrical control modules to prevent short-circuiting the unit or the body harness.
Troubleshooting Tip
If you are looking for this module because your automatic headlights are failing, check these common, easier-to-fix points first:
- Dashboard Sensor: Check for anything covering the small light sensor on the dash (like a phone mount, parking pass, or heavy dust).
- Headlight Switch: Ensure the switch on the steering column is actually clicked into the “AUTO” position.
- Fuses: Check your interior fuse box for any blown fuses related to “Illumination,” “Headlight,” or “Body Control.”
- Wiring: Inspect the wiring harness behind the headlight switch on the steering column, as these can sometimes become loose or corroded.