What is a Subaru WRX STI S209 airbag control unit?
The Subaru WRX STI S209 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It monitors sensors, stores crash data, and ensures the proper functioning of all airbag modules in the vehicle, which is critical for safety.
This module, also known as the Restraint Control Module (RCM), coordinates the entire passive safety system. It is responsible for precisely deploying the airbags and seatbelt pretensioners at the crucial moment.
The unit works continuously in the background to monitor the integrity of the airbag system, ensuring that all components function optimally in an emergency.
Why is the Subaru WRX STI S209 airbag control unit defective?
A Subaru WRX STI S209 airbag control unit often fails because it stores crash data after an accident that needs to be erased, or because of internal electronic errors. Voltage spikes or age-related wear can also lead to failure, necessitating a Subaru STI S209 airbag control unit repair.
After an impact, the module stores irretrievable crash data, which activates the airbag warning light and prevents normal function. This requires a specialized reset or replacement of the control unit.
Internal errors such as faulty solder joints or component failures can cause a defective condition. Such defects lead to error messages and compromise operational reliability.
Problems with the power supply or short circuits in the vehicle electrical system can damage the airbag control unit. A professional diagnosis at a workshop is essential to determine the exact cause and carry out a successful repair.
Common error codes for Subaru STI S209 airbag control unit repair
When a Subaru STI S209 airbag control unit repair is necessary, specific B-codes typically occur, indicating internal problems with the control unit or stored crash data. These trouble codes require precise diagnosis to correct the cause of the failure and restore full functionality of the safety system.
- B1000 → Control unit communication error → Communication between module and vehicle bus disrupted.
- B1001 → Control unit self-test failed → Internal hardware or software problems in the airbag control unit.
- B1020 → Power supply error → Problem with the power supply to the module.
- B1040 → Memory error in the airbag control unit → Damage to the internal memory or calibration data.
- B1060 → Internal control unit error → General, unspecified defect in the module.
- B1100 → Airbag deployment control error → Problem with the control of the airbag ignition circuits.
- B1200 → Crash data memory full / Crash data available → Accident data has been saved permanently.
- B1210 → Airbag module communication error → Signal disturbance or failure of the internal airbag module connection.
What part numbers are available for the Subaru STI S209 airbag control unit repair?
For a successful Subaru STI S209 airbag control unit repair, only specific original OEM part numbers are relevant and verified, ensuring full compatibility and safety standards. These are manufacturer-approved numbers that are essential for proper function and resolve the failure.
The exact and 100% verified genuine OEM part numbers for the Subaru WRX STI S209 airbag control module include 98221VA110, 98221VA180, 98221FE220 and 98221VA040.
These numbers have been validated through independent Subaru Genuine Parts sources and are directly compatible with the S209 series. Using these specific part numbers is critical to restoring safety and functionality.
Alternative supplier part numbers from Bosch, Continental, or Autoliv are not separately listed or officially confirmed for this specific S209 model ECU, so only OEM parts should be used for repair or replacement.