Airbag control unit with part number 89170-42860

What does the airbag control unit 89170-42860 do?

The airbag control unit 89170-42860 is the central control unit of the SRS restraint system for Toyota. It processes the measured values from the crash sensors, triggers the matching airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system continuously. After an accident, it stores crash data and locks itself.

The control unit indicates faults in the restraint system via the airbag warning light in the instrument cluster. This makes it the point where problems in the system first become visible.

The crash data stay stored in the unit until the repair takes place. You do not need to know more for understanding the function, as the rest follows from the technology of the system.

Why does the control unit 89170-42860 fail?

The most common cause with the 89170-42860 is stored crash data from an accident, even if no airbag was triggered. Other causes are aged components, corrosion at plug connections, cold solder joints and voltage spikes.

A normal diagnostic tool cannot erase the crash data. Airbag24 erases them as part of the repair.

The other causes at a glance:

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

How can you tell that the 89170-42860 is defective?

A defect on the 89170-42860 shows as the airbag warning light lighting up permanently or intermittently. In addition there is an error message in the instrument cluster and notes in the diagnostic procedure.

• Airbag warning light permanently or intermittently on
• Error message in the instrument cluster
• No connection of the diagnostic tool to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. This applies regardless of how long the light comes on.

A fault memory that cannot be cleared is an additional indication of a fault that you should have checked.

Which vehicles is the 89170-42860 fitted in?

The 89170-42860 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The vehicles to which this part number applies are listed here:

• Toyota RAV4 XA50 (from 2018)

Two steps are useful before removal. The part number on the label of the removed unit gives a number that you compare with this page; this only confirms that it is the right unit. Also have the fault memory read out, because only this 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, 89170-0R070, 89170-0R090, 89170-0R091.

How does the repair of the 89170-42860 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit 89170-42860. Next, create a repair order online and send the well-packed unit in.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. These steps usually take 3–4 working days.

The unit is then 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 89170-42860 get to Airbag24?

You send the control unit 89170-42860 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.