Airbag control unit with part number 89170-42D81

What does the airbag control unit 89170-42D81 do?

The airbag control unit 89170-42D81 evaluates the crash sensors in vehicles of Toyota and decides in a crash within milliseconds on airbags and seatbelt pretensioners. At the same time it monitors the entire restraint system (SRS) continuously.

The unit reports faults via the airbag warning light in the instrument cluster, so that the driver notices them.

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

Why does the control unit 89170-42D81 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered. Other causes include ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data cannot be erased with a normal diagnostic tool. The control unit therefore remains in the fault state until the data is removed during the repair.

The other causes at a glance:

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

How can you tell that the 89170-42D81 is defective?

An airbag warning light in the instrument cluster that lights up permanently or intermittently, an error message in the instrument cluster, no connection from the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

Typical signs are:

• airbag warning light on permanently or intermittently
• error message in the instrument cluster
• diagnostic tool without a connection to the control unit
• fault memory cannot be cleared

The warning light therefore shows the defect.

Which vehicles is the 89170-42D81 fitted in?

The control unit 89170-42D81 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The following shows the vehicles assigned to this part number.

• Toyota RAV4 XA50 (from 2018)

Compare the part number on the label of the removed unit with this page, so you can see whether it is the correct unit. Please also have the fault memory read out beforehand. The result 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 89170-42D81 work?

For the 89170-42D81, first have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit. Next you create a repair order online and send in the carefully packed unit. Processing at Airbag24 takes 3–4 working days as a rule.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. 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 89170-42D81 get to Airbag24?

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

Place the printed repair order in the parcel and pack the unit shock-proof.