Airbag control unit with part number 89170-42F80

What does the airbag control unit 89170-42F80 do?

The unit 89170-42F80 controls the restraint system of Toyota and is therefore the SRS control unit of the vehicle. It evaluates signals from the crash sensors and, in a collision within milliseconds, decides on the triggering of airbags and seatbelt pretensioners.

The system is monitored continuously; if the control unit detects a fault, the airbag warning light in the instrument cluster lights up.

An accident causes crash data to be stored and the unit to lock itself.

Why does the control unit 89170-42F80 fail?

Crash data remaining in memory after an accident is the most common cause with the 89170-42F80, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Ageing components, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes, are also possible causes.

The memory keeps this data.

Other causes take effect over a longer period: electronics age, cold solder joints develop, and moisture attacks plug connections. In addition, voltage spikes, for example from a weak battery or a jump start, can strain the unit.

How can you tell that the 89170-42F80 is defective?

A defect on the 89170-42F80 shows through indications in the instrument cluster and through problems during diagnosis. The airbag warning light is the most conspicuous sign.

• Permanent lighting of the airbag warning light
• Intermittent lighting of the airbag warning light
• Fault message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory that cannot be erased

In an emergency, airbags and seatbelt pretensioners may then not deploy. Prompt inspection is therefore sensible.

Which vehicles is the 89170-42F80 fitted in?

The control unit 89170-42F80 is fitted in the following vehicles: Toyota RAV4 XA50 (from 2018). Check the list to see whether your car is included.

The vehicles known to us for this part number are listed here:

• Toyota RAV4 XA50 (from 2018)

Comparing the part number on the label of the removed unit ensures that you have the right unit in front of you. Before removal, 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 89170-42F80 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit 89170-42F80. Then create a repair order online and send the unit well packed; at Airbag24 processing usually takes 3–4 working days.

Airbag24 checks the control unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Your own 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 89170-42F80 get to Airbag24?

For shipping the 89170-42F80, a parcel is sufficient, or you book a UPS collection for an extra charge. The return after the repair is by UPS.

The printed repair order goes into the parcel. Pack the unit shock-proof.