Airbag control unit with part number 89170-0H210

What is the function of the airbag control unit 89170-0H210?

The part number 89170-0H210 identifies an airbag or SRS control unit manufactured by TRW (identification 337644-102), primarily installed in the Peugeot 108 I. Its main task is to monitor the passive safety system, evaluate crash sensor signals, and precisely trigger the airbags and seatbelt pretensioners within seconds in the event of a collision.

As the central control unit of the passive safety system (Supplemental Restraint System, SRS), this module continuously monitors data from acceleration and pressure sensors distributed throughout the vehicle. In the event of a collision, it analyzes incoming signals within milliseconds to assess the severity of the impact.

Based on this analysis, the control unit determines which restraint systems need to be activated. It selectively deploys the appropriate airbags and seatbelt pretensioners to provide optimal protection for occupants. After deployment, the device stores crash data, preventing further use without professional repair.

Why does the control unit 89170-0H210 fail?

Defects in the 89170-0H210 control unit typically arise from two primary causes: stored crash data following airbag deployment, which locks the module, or internal hardware failures. These include defective SMD components, damaged capacitors, faulty solder joints, or short circuits on the circuit board, requiring component-level repairs.

The most common reason for repair requests is the storage of crash data. After an accident involving airbag or seatbelt pretensioner deployment, a permanent entry is recorded in the control unit’s memory. For safety reasons, this entry locks the module and can only be reset using specialized equipment.

In addition, purely electronic faults may occur on the circuit board. Defective SMD components, aging capacitors, cold solder joints, or internal short circuits can lead to malfunctions. Such hardware defects prevent proper communication or cause persistent internal errors that are logged in the fault memory. The control unit is also known under the TRW manufacturer identification 337644-102.

How do you recognize a defect in the 89170-0H210?

A defective airbag control unit 89170-0H210 primarily manifests as a permanently illuminated airbag warning light on the instrument panel. Often, the control unit can no longer be accessed via diagnostic tools (communication failure), or specific error codes are stored indicating an internal malfunction of the module.

The most obvious sign is the continuously lit or intermittently flashing SRS warning lamp. This indicates that the safety system is not functioning properly and may fail to deploy in the event of a crash.

Another clear symptom is the lack of communication capability. If the workshop cannot establish a connection with the airbag control unit using a diagnostic tool, this often points to a serious internal hardware fault on the CAN bus or power supply.

Additionally, specific error codes may be stored in the vehicle’s fault memory, directly indicating an internal defect in the control unit—such as issues with the internal power supply, memory, or ignition circuits.

In which vehicles is the control unit 89170-0H210 installed?

The airbag control unit with part number 89170-0H210 and the alternative TRW identification 337644-102 is specifically designed for the first-generation Peugeot 108. At Airbag24, this module is professionally repaired for all variants of the Peugeot 108 I produced between approximately 2014 and 2022.

The repair service at Airbag24 covers the following models:

Peugeot: 108 I (model years approx. 2014–2022)

How is the 89170-0H210 professionally repaired?

At Airbag24, repairing the 89170-0H210 begins with a comprehensive initial inspection of communication and the fault memory. Depending on the findings, either the stored crash data is safely and completely erased, or a component-level repair is performed, replacing defective electronic parts. Final functional tests ensure full operability, backed by 2 years' statutory liability for defects.

After the control unit arrives at Airbag24, technicians conduct a detailed diagnosis. First, they check communication over the CAN bus and read out the fault memory to pinpoint the exact cause of the issue. This initial step determines the subsequent repair approach.

If the problem lies in stored crash data, these are removed from the control unit’s memory (EEPROM/Flash) using specialized programming devices. If the issue is an electronic fault, a component-level repair is carried out, where defective parts such as ICs, capacitors, or damaged solder joints are restored using micro-soldering techniques.

Subsequently, each repaired control unit undergoes a comprehensive functional test on a test bench. Here, all functions are simulated and validated to ensure flawless operation. All repairs come with 2 years' statutory liability for defects.