Airbag control unit with part number 89170-08120

What does the airbag control unit 89170-08120 do?

The airbag control unit 89170-08120 is the central control unit of the restraint system (SRS) of Toyota. In an accident it decides, within milliseconds, which airbags and seatbelt pretensioners are triggered.

It continuously evaluates the signals from the crash sensors and monitors the whole system. It reports faults via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 89170-08120 fail?

The most common cause of a defective 89170-08120 is crash data stored after an accident, even if no airbag was triggered. Further causes include ageing components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data cannot be erased with a standard diagnostic tool. Airbag24 erases it during the repair.

Aged components and cold solder joints count as typical weak points where faults can arise.

Moisture and corrosion at plug connectors, as well as voltage spikes, for example from a weak battery or a jump start, round off the picture.

How can you tell that the 89170-08120 is defective?

Signs of a defect in the 89170-08120 are mainly the airbag warning light, which stays on permanently or intermittently, a fault message in the instrument cluster, a missing connection to the diagnostic tool, or a fault memory that cannot be cleared.

The signs include:

• airbag warning light, permanently or intermittently
• fault message in the instrument cluster
• missing connection to the diagnostic tool
• fault memory that cannot be cleared

With these findings, airbags and seatbelt pretensioners may fail to trigger in an emergency. A prompt check is therefore advisable.

Which vehicles is the 89170-08120 fitted in?

The 89170-08120 is fitted in these vehicles: Toyota Sienna XL30 (2010-2020). The information applies to this part number only.

The following vehicles belong to this part number:

• Toyota Sienna XL30 (2010-2020)

Comparing the part number on the label of the removed unit with this page ensures that you have the right unit. Whether the control unit itself is defective or a plug or cable is the cause is shown by the fault memory. Have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 89170-08040, 89170-08130, 89170-08140, 89170-08170, 89170-08230.

How does the repair of the 89170-08120 work?

First have the fault memory read out and attach the log, then disconnect the battery. Only then remove the 89170-08120.

Next create the repair order online and pack the unit well before you send it in.

Airbag24 checks the control unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Then the unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days. 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 89170-08120 get to Airbag24?

You can send the 89170-08120 in as a parcel or book a UPS collection for an extra charge. Airbag24 handles the return shipment after the repair with UPS.

Enclose the printed repair order in the box and pack the unit shock-resistant.