Airbag control unit with part number 89170-0R021

What does the airbag control unit 89170-0R021 do?

The airbag control unit 89170-0R021 controls the restraint system (SRS) of Toyota. It reads the signals from the crash sensors and determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered. The airbag warning light shows faults in the system.

The unit works in the background whenever the vehicle is in operation, checking the connections and the connected components. This keeps the system ready for an emergency.

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

Why does the control unit 89170-0R021 fail?

The most common cause for the 89170-0R021 is stored crash data after an accident, even if no airbag was triggered. Further causes are aged electronics, moisture and corrosion at plug connections, cold solder joints and voltage spikes.

The crash data remains in the unit, because a normal diagnostic tool cannot erase it. This means the fault persists even though the system looks inconspicuous from the outside.

Aged electronic components show up as declining performance, cold solder joints arise during manufacturing or through vibrations in operation. Moisture and corrosion attack plug connections. Voltage spikes occur, for example, with a weak battery or when a jump-start is used.

How can you tell that the 89170-0R021 is defective?

A defect on the 89170-0R021 shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition, there is an error message in the instrument cluster, a diagnostic tool without connection, and a fault memory that cannot be cleared.

With a warning symbol lit, the system may not reliably trigger in an emergency. Airbags and seatbelt pretensioners may then fail to trigger, and the warning light points to exactly this.

Which vehicles is the 89170-0R021 fitted in?

The 89170-0R021 is fitted in these vehicles: Toyota RAV4 XA30 (2006-2009) and XA30 Facelift (2009-2013).

The overview shows the vehicles in which this control unit is installed.

• Toyota RAV4 XA30 (2006-2009)
• Toyota RAV4 XA30 Facelift (2009-2013)

Compare the number on the label of the removed unit with 89170-0R021 on this page. This only clarifies whether it is the right unit. Have the fault memory read beforehand, because only this log shows whether the control unit or a connector or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 150300-8850, 89170-0R022, 89170-0R140, 89170-42201, 89170-42210, 89170-42420.

How does the repair of the 89170-0R021 work?

First you read out the fault memory and enclose the log. Then you disconnect the battery and only then remove the control unit. Online, you create a repair order and send the well-packed unit in.

Airbag24 checks it on the test bench, repairs defective components, erases stored crash data and carries out a function test. Processing usually takes 3–4 working days. After that, the unit goes 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 89170-0R021 get to Airbag24?

You send the control unit 89170-0R021 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Print the repair order and place it in the parcel. Pack the unit shock-resistant.