Airbag control unit with part number TRW 337644-101-95160

What is the TRW 337644-101-95160 Airbag Control Unit?

The TRW 337644-101-95160 Airbag Control Unit is the central control module of the Supplemental Restraint System (SRS) in the Toyota Aygo AB40. It processes signals from impact sensors to deploy airbags and seatbelt pretensioners in the event of a crash. This unit corresponds to Toyota OEM part numbers 891700H020, 8917042D50, and 891700H190.

As an SRS Control Unit, this component plays a critical role in the vehicle’s passive safety system. It continuously monitors all connected sensors and actuators of the airbag system to ensure flawless operation in an emergency.

Following a collision, the unit stores relevant crash data. While this function is essential for accident analysis, it simultaneously locks the control unit from further operation, necessitating professional repair or replacement.

Why Does the TRW 337644-101-95160 Control Unit Fail?

The most common cause of failure for the TRW 337644-101-95160 is the storage of crash data after an accident, which locks the system. Other defects arise from electronic malfunctions such as internal errors, water damage, or component failures—like processors and capacitors—that can lead to communication issues.

After a crash, a permanent entry reading “Crash Data Stored” is written into the control unit’s internal memory. This entry prevents re‑deployment and disables the entire airbag system until the unit is professionally reset or repaired.

Electronic faults can also occur without any crash event. Common causes include component aging, corrosion from moisture ingress, or voltage spikes in the vehicle’s electrical system, all of which may trigger an internal malfunction.

How Do You Recognize a Fault with the TRW 337644-101-95160?

A fault in the TRW 337644-101-95160 control unit primarily manifests as a permanently illuminated or flashing SRS airbag warning light on the instrument cluster. The vehicle indicates that the airbags are deactivated. Often, diagnostic trouble codes such as “Control Unit Fault” or “Internal Error” can be retrieved from the fault memory.

The illumination of the SRS light is a critical safety warning. It means that in the event of another collision, neither airbags nor seatbelt pretensioners will deploy, posing a significant safety risk and requiring immediate action.

In some cases, communication with the control unit via an OBD diagnostic tool may also become impossible. The unit fails to respond to queries, complicating diagnostics at the workshop and suggesting a severe internal fault.

In Which Models Is the TRW 337644-101-95160 Installed?

The TRW 337644-101-95160 airbag control unit is specifically designed for the second-generation Toyota Aygo (AB40). At Airbag24, we service this control unit for both the pre-facelift and facelift models of this series. Compatibility covers the entire production run of the Aygo AB40.

Specifically, this control unit is installed in the following models and model years:

Toyota Aygo AB40 (model years 2014–2018)

Toyota Aygo AB40 Facelift (model years 2018–2021)

The listed Toyota reference numbers (891700H020, 8917042D50, 891700H190) confirm its exclusive association with these vehicle models.

How Does Repair Work at Airbag24?

At Airbag24, repairing the TRW 337644-101-95160 follows a standardized process. After receiving your removed unit, we conduct a detailed incoming inspection. We then clear stored crash data and repair defective electronic components at the component level, followed by a comprehensive functional test.

The first step involves a professional analysis of reported faults. Our technicians use specialized testing setups to precisely pinpoint the root cause—whether it’s a simple crash‑data entry or a deeper hardware issue.

The actual repair includes erasing crash data from memory and either repairing or replacing damaged components such as processors or capacitors. The goal is to restore the control unit to full functionality, comparable to a new part.

Following successful repair, each control unit undergoes a final test to ensure compliance with manufacturer specifications. We provide 2 years' statutory liability for defects on all repairs.