Airbag control unit with part number 89170-0R351

What does the airbag control unit 89170-0R351 do?

The 89170-0R351 is an airbag control unit for the restraint system (SRS) in Toyota vehicles. It processes the signals from the crash sensors, and in a crash it decides within milliseconds which airbags and seatbelt pretensioners fire.

During operation it monitors the system and shows faults via the airbag warning light in the instrument cluster.

After a crash the unit stores crash data and locks itself.

Why does the control unit 89170-0R351 fail?

The most common cause is stored crash data, even when no airbag has deployed, because a standard diagnostic tool cannot erase it. Other causes may also apply.

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

Airbag24 erases crash data during the repair; the test establishes the other causes.

How can you tell that the 89170-0R351 is defective?

If the airbag warning light on the 89170-0R351 stays on permanently or intermittently, a defect may be present. Fault messages in the instrument cluster are also among the signs.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. This is why the light must be taken seriously.

The test establishes which part of the system is affected.

Which vehicles is the 89170-0R351 fitted in?

The 89170-0R351 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The list shows the vehicles for this part number:

• Toyota RAV4 XA50 (from 2018)

That the part number on the label of the removed unit matches this page only confirms the correct unit. It says nothing about the cause. Before you send the unit in, have the fault memory read out; only this result shows whether the control unit is defective or a plug or cable is behind it.

For the same vehicles, we also repair control units with the part numbers 150800-4431, 152100-0262, 152100-4560, 89170-0R070, 89170-0R090, 89170-0R091.

How does the repair of the 89170-0R351 work?

First have the fault memory read out and attach the log, then disconnect the battery. Only then remove the control unit 89170-0R351. Processing at Airbag24 normally takes 3–4 working days.

The sequence is mandatory for safety reasons. Then create a repair order online and send the unit off, well packed.

At Airbag24 the unit is tested on the test bench, defective components are repaired, crash data is erased and a function test is run. 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 89170-0R351 get to Airbag24?

You send the control unit 89170-0R351 as a parcel, or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-resistant.