Airbag control unit with part number 89170-42D80

What does the airbag control unit 89170-42D80 do?

The airbag control unit 89170-42D80 forms the central control of the restraint system (SRS) in Toyota. It analyses the crash sensors, determines the triggering moment of the airbags and seatbelt pretensioners within fractions of a second in a crash, and monitors the system continuously.

If it detects a fault, it reports it via the airbag warning light in the instrument cluster. The warning is therefore part of the function itself.

In an accident, the unit saves crash data and then locks itself.

Why does the control unit 89170-42D80 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. An ordinary diagnostic tool does not erase it. Other causes are ageing components, moisture on plugs and voltage spikes.

Airbag24 removes the crash data during the repair. The other causes in detail are:

• Ageing electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery

How can you tell that the 89170-42D80 is defective?

Signs are an airbag warning light that lights up permanently or intermittently, and an error message in the instrument cluster. In addition, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared.

• Airbag warning light lights up permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool has no connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. A check is therefore advisable soon.

Which vehicles is the 89170-42D80 fitted in?

The 89170-42D80 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The vehicles are listed in detail here:

• Toyota RAV4 XA50 (from 2018)

Comparing the part number on the label of the removed unit with this page only shows that it is the correct unit. The condition of the control unit is determined only by the fault memory read out. It shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 150800-4431, 152100-0262, 152100-4560, 89170-42400, 89170-42870, 89170-42A60.

How does the repair of the 89170-42D80 work?

Processing at Airbag24 usually takes 3–4 working days. First have the fault memory read out and enclose the log, then disconnect the battery. Then remove the control unit, create the repair order online and send it in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. This time frame refers exclusively to this work. Afterwards your 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 89170-42D80 get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

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