Airbag control unit with part number 89170-58140

What does the airbag control unit 89170-58140 do?

The airbag control unit 89170-58140 forms the centre of the restraint system (SRS) in Toyota. It processes the measurements from the crash sensors, determines within milliseconds in a crash which airbags and seatbelt pretensioners fire, and checks the system continuously.

If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster. Without a functioning control unit, the restraint system cannot reliably perform its task.

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

Why does the control unit 89170-58140 fail?

Most often the cause is crash data from an accident, even if no airbag has deployed; a normal diagnostic tool does not erase it. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Decisive is that the unit registered the crash as a crash and stored it. The data sits in the control unit itself, so nothing on the outside of the vehicle shows it.

The other causes are general in nature. Electronics age, solder joints can have gone cold, and moisture or corrosion impairs contact at plug connections.

Voltage spikes also stress the unit. A weak battery or jump-starting can cause such spikes.

How can you tell that the 89170-58140 is defective?

The airbag warning light in the instrument cluster lights up continuously or intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The airbag warning light is the most important warning sign, because it constantly shows a fault as soon as the system detects it. That the light is on does not automatically mean that the control unit itself is defective; a plug or a cable can be the cause as well.

In an emergency, airbags and seatbelt pretensioners may fail to deploy. Therefore have the system checked promptly.

Which vehicles is the 89170-58140 fitted in?

The control unit 89170-58140 is fitted in these vehicles: Toyota Alphard H30 (2015-2023). A list does not replace a test of the removed unit.

The following overview names the vehicles for which we hold this part number.

• Toyota Alphard H30 (2015-2023)

Compare the part number on the label of your removed unit with this page. This only confirms that the unit is the right one; it does not establish the cause. So have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 89170-58140 work?

Have the fault memory read out first and enclose the log with the unit. Then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is first checked on the test bench. Afterwards defective components are replaced, stored crash data is erased, and a function test follows. Then your own unit is returned to you.

The order of steps on the vehicle is for safety and therefore applies without exception. So always start with reading out the fault memory.

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 89170-58140 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns your own unit to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-resistant. A well-padded packaging protects it on the way.