Airbag control unit with part number 89170-07290

What does the airbag control unit 89170-07290 do?

The airbag control unit 89170-07290 runs the SRS restraint system of Toyota in the vehicle. It takes in the values from the crash sensors, selects airbags and seatbelt pretensioners for triggering in an accident within milliseconds, and monitors the system without pause. It reports faults via the airbag warning light.

The circuit operates as long as the vehicle is under voltage. It checks the sensors, their wiring and the triggering circuits of the airbags and seatbelt pretensioners.

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

Why does the control unit 89170-07290 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot remove it. Added to this are aged electronic components, moisture and corrosion at plug connections, cold solder joints and voltage spikes.

The crash data remains in the unit until Airbag24 erases it during the repair. This step is part of the repair.

Over time components can weaken, and moisture attacks contacts. Which of these causes is present in an individual case only the check will show. Voltage spikes, for example from a weak battery or a jump start, additionally strain the unit.

How can you tell that the 89170-07290 is defective?

A defect becomes visible when the airbag warning light in the instrument cluster shows, whether permanently or only intermittently. A message on the display may accompany it, or the diagnostic tool cannot find the control unit. While such a state persists, airbags and seatbelt pretensioners may not be able to deploy in an emergency.

Watch the light preferably after each time you switch on the ignition. If it stays on, have the system checked promptly.

Even if the diagnostic tool cannot establish a connection, a check is worthwhile, because a communication fault is then present. It can lie in the control unit, in wiring or in plugs.

Which vehicles is the 89170-07290 fitted in?

The control unit 89170-07290 is fitted in these vehicles: Toyota Avalon XX40 (2012-2015) and XX40 Facelift (2015-2018).

The following list shows the vehicles that belong to this part number.

• Toyota Avalon XX40 (2012-2015)
• Toyota Avalon XX40 Facelift (2015-2018)

A glance at the label of the removed unit is enough to compare it with this page. The part number there must match the one here, otherwise it is a different unit. Have the fault memory read out beforehand, because only the log shows whether the control unit itself is affected or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-07350, 89170-07480.

How does the repair of the 89170-07290 work?

Before removal, have the fault memory read out, attach the log and disconnect the battery. Then remove the control unit and create the repair order online. Airbag24 needs 3–4 working days in general for testing, repair and function test.

At Airbag24 the unit goes onto the test bench, where defective components are repaired, stored crash data is erased and a function test is run before 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 89170-07290 get to Airbag24?

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

The printed repair order belongs in the parcel. Pack the control unit so that it withstands impacts before you hand it over.