Airbag control unit with part number 89170-08100

What does the airbag control unit 89170-08100 do?

The airbag control unit 89170-08100 is the central control unit of the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It reports faults via the airbag warning light. In addition, it stores any deviations it detects in the fault memory.

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

Why does the control unit 89170-08100 fail?

The most common cause is crash data stored after an accident, even without an airbag having been triggered; a normal diagnostic tool cannot erase it. Other causes include ageing electronic components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data remains in the unit until it is removed during the repair. The finding is independent of whether an airbag actually deployed.

The other causes can be summarised in a few points:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 89170-08100 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Typical signs are:

• the airbag warning light is on permanently or intermittently
• a fault message in the instrument cluster
• no connection between the diagnostic tool and the control unit
• a fault memory that cannot be cleared

If you notice any of these signs, have the system checked promptly.

Which vehicles is the 89170-08100 fitted in?

The airbag control unit 89170-08100 is fitted in these vehicles: Toyota Sienna XL20 (2004-2005) and XL20 Facelift (2006-2010).

The list shows the vehicles for which this unit is intended.

• Toyota Sienna XL20 (2004-2005)
• Toyota Sienna XL20 Facelift (2006-2010)

Before removal, compare the part number on the label with this page, so you know it is the right unit. Also have the fault memory read out beforehand, because only this result shows whether the control unit is defective or a plug or cable is the cause.

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

How does the repair of the 89170-08100 work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit and create a repair order online before sending the unit off well packed. Airbag24 usually needs 3–4 working days for testing, repair and checking.

At Airbag24 the unit is checked on the test bench, defective components are replaced, stored crash data is erased and a function test is carried out. The unit then comes back 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 89170-08100 get to Airbag24?

You send the unit in as a parcel, or book a UPS collection for an extra charge. Airbag24 returns it to you by UPS after the repair.

Put the printed repair order into the parcel and pack the unit shock-proof.