2009-2011 Mitsubishi Lancer Ralliart Air Bag Module: Recalls, Programming, and Replacement

Symptoms of a Failing Air Bag Control Module

The most common and immediate sign of a problem with the airbag control module is an illuminated airbag or SRS warning light on your dashboard. This light indicates that the safety system has detected a fault and has been disabled. In the event of an accident, your airbags will not deploy.

• Airbag/SRS Warning Light: The light will stay on continuously after the initial startup check. This is the primary symptom of a fault.
• Failure to Communicate: A technician may find that their diagnostic scan tool cannot communicate with the airbag module, indicating a total failure of the unit.
• Stored Fault Codes: A professional scan tool can read specific Diagnostic Trouble Codes (DTCs) from the module. Common codes pointing to an internal module failure include B1400 (Airbag ECU Malfunction) and B1480 (ACU Coding Error).
• Corrosion or Water Damage: Because the module is often located on the floor under the center console, it can be susceptible to damage from spills or water intrusion, leading to corrosion and failure.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While there are no recalls specifically for the airbag control module on these vehicles, there is a critical recall for a related component that produces the same symptom (airbag light on).

NHTSA Recall 09V435000 (Mitsubishi Recall SR-09-005): Front Impact Sensor Corrosion

This important safety recall affects 2008-2009 Lancer models, including the Ralliart, originally sold or registered in salt-belt states. In these regions, a mixture of road salt and water can enter the front impact sensor housings, causing internal corrosion. This corrosion can trigger the airbag warning light and, more dangerously, could cause a delay in airbag deployment during a frontal crash. The fix involves replacing both front impact sensors with new, redesigned parts. Before replacing your airbag module, it is crucial to check if your vehicle is affected by this recall, as faulty sensors could be the true cause of your airbag light.

Takata Airbag Inflator Recalls

Many Mitsubishi vehicles from this era, including the Lancer, were part of the massive Takata airbag inflator recalls. It is important to understand that these recalls are for the inflator mechanisms inside the airbag assemblies themselves (e.g., in the steering wheel and dashboard), not for the separate electronic control module discussed in this article.

TSB-13-52B-001: Updated SRS Caution Statements

In January 2013, Mitsubishi issued a technical service bulletin to update service manuals with correct caution and disposal procedures for SRS components on 2008-2013 Lancers. This highlights the sensitive nature of these parts and the need for proper handling.

Buying a Used 2009-2011 Lancer Air Bag Module

Buying a used airbag control module can be a cost-effective solution, but it requires careful attention to detail to ensure compatibility and function. This is not a simple plug-and-play part.

1. Match the Part Number Exactly

The correct OEM part number for the 2009-2011 Lancer Ralliart is 8635A109. This module is specific to Ralliart models and will not work in base model Lancers or the Lancer Evolution. You must verify that the part number on the replacement unit is an exact match to your original module.

2. Avoid Modules with Stored 'Crash Data'

If a vehicle is in an accident where airbags deploy or seatbelt pre-tensioners activate, the module permanently stores "crash data." A module with crash data is locked and will not function, and the airbag light will remain on until this data is cleared. When buying used, ask the seller if the module was removed from a wrecked vehicle. It is safest to assume any used module will need to have its crash data cleared by a professional service.

3. Physical Inspection

Before purchasing, inspect the module for any signs of physical damage, especially corrosion on the case or pins. Water damage from spills is a common cause of failure. Do not use a module that shows any signs of corrosion or impact damage.

4. Programming is Mandatory

A used module must be programmed to your vehicle's VIN after installation. Without this step, the module will not communicate with the other systems in your car, and the SRS light will stay on. This typically requires a dealer or a specialized independent shop with advanced diagnostic tools.

Programming and Installation Requirements

Replacing the airbag control module is a multi-step process that requires both careful physical installation and electronic programming.

Installation

The module is located under the center console, between the front seats. The key safety procedure is to disconnect the negative battery terminal and wait at least one minute before unplugging the module's distinctive yellow connectors. This allows the internal capacitors, which hold a charge to deploy the airbags even if battery power is lost in a crash, to fully discharge.

Programming and Data Resetting

There are two main scenarios for programming:

• Installing a New or Used Module: If you install a different module (new or used), it must be programmed to your car's Vehicle Identification Number (VIN). This can be done by a Mitsubishi dealer or an independent repair shop with a high-level scan tool like an Autel MaxiSys that has this capability.
• Resetting Your Original Module: A popular and cost-effective option is to remove your original module and send it to a specialized service that will clear the stored crash data. Because the module is original to the car, it retains the correct VIN and becomes plug-and-play upon reinstallation, with no further programming needed.

Replacement Cost Comparison

Prices can vary by location and supplier. The following are estimates to help you understand the potential costs.

Frequently Asked Questions (FAQ)