Airbag control unit with part number 89170-0H220

What does the airbag control unit 89170-0H220 do?

The airbag control unit 89170-0H220 is the control unit of the restraint system (SRS) in Toyota, Citroën and Peugeot vehicles. It processes the crash sensors, decides on airbags and seatbelt pretensioners within milliseconds in the event of an impact, and monitors the system during operation. It reports faults via the airbag warning light.

The measured values from the sensors flow into the unit continuously, and it compares them against fixed criteria.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 89170-0H220 fail?

The most common cause is stored crash data after an accident, even if no airbag has fired. Diagnostic tools available in the trade do not remove it. Other causes are aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains in the unit until it is removed during a repair. Whether an airbag actually deployed makes no difference to this.

The other causes relate to wear and moisture. Components age, solder joints can become brittle, and moisture or corrosion at plugs disrupt the connection. Voltage spikes when starting, for example with a weak battery, additionally affect the electronics.

How can you tell that the 89170-0H220 is defective?

You recognise a fault by the airbag warning light, which stays on permanently or comes on from time to time. Additional fault messages may appear, the connection to the diagnostic tool cannot be established, or the fault memory remains occupied. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

These are the most important warning signs:

• airbag warning light is on permanently or from time to time
• fault message in the instrument cluster
• diagnostic tool cannot reach the control unit
• fault memory cannot be cleared

Have the vehicle checked promptly if you notice such signs.

Which vehicles is the 89170-0H220 fitted in?

The control unit 89170-0H220 is fitted in these vehicles: Toyota Aygo AB40 (2014-2018) and AB40 Facelift (2018-2021); Citroën C1 II (2014-2022); Peugeot 108 I (2014-2022). So comparing it with your car comes first.

The vehicles for this part number are listed here:

• Toyota Aygo AB40 (2014-2018)
• Toyota Aygo AB40 Facelift (2018-2021)
• Citroën C1 II (2014-2022)
• Peugeot 108 I (2014-2022)

First, compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Then have the fault memory read out before you remove anything. Only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 337644-101, 337644-102, 6546 F8, 89170-0H020, 89170-0H040, 89170-0H130.

How does the repair of the 89170-0H220 work?

First, you have the fault memory read out and keep the log. Then you disconnect the battery and only now remove the control unit 89170-0H220. Next, you create an online repair order and send in the unit, well packed.

Airbag24 checks the unit, replaces defective components, deletes the stored crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days for testing, repairing and checking. Afterwards, your own unit is returned to you.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 89170-0H220 get to Airbag24?

You send the control unit 89170-0H220 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends the repaired unit back to you by UPS.

Pack the control unit shock-proof and enclose the printed repair order.