Airbag control unit with part number 89170-07531

What does the airbag control unit 89170-07531 do?

The 89170-07531 is the airbag control unit in the restraint system (SRS) of Toyota. It processes the signals from the crash sensors, decides within milliseconds in the event of an accident which airbags and seatbelt pretensioners are triggered, and checks the system constantly.

The unit reports faults via the airbag warning light in the instrument cluster. This tells you as the driver that there is a problem in the restraint system.

After an accident, it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 89170-07531 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or a jump start.

Crash data stay in the memory until they are erased. At Airbag24 they are erased during the repair, and the unit then works again without this lock.

Aged components, cold solder joints, moisture at plug connections and voltage spikes in the vehicle electrical system are among the other causes. They affect the electronics themselves and their surroundings.

How can you tell that the 89170-07531 is defective?

A defect shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently. Error messages also appear in the instrument cluster, the diagnostic tool does not find the control unit, and the fault memory cannot be cleared. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

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

If you notice any of these signs, have the system checked promptly. The warning light shows the defect, so it does not stay hidden.

Which vehicles is the 89170-07531 fitted in?

The 89170-07531 is fitted in these vehicles: Toyota Avalon XX50 Facelift (from 2022) and XX50 (2018-2022).

The list below shows the vehicles for which this part number is stated.

• Toyota Avalon XX50 Facelift (from 2022)
• Toyota Avalon XX50 (2018-2022)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Have the fault memory read out beforehand, because only that shows whether the control unit or a plug or cable is the cause.

How does the repair of the 89170-07531 work?

First you read out the fault memory and enclose the log. Then you disconnect the battery, remove the control unit and create a repair order online. Airbag24 checks the unit on the test bench, repairs defective components, erases crash data and carries out a function test.

Pack the unit well and send it in. Processing at Airbag24 usually takes 3–4 working days, which covers checking, repairing and testing.

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 89170-07531 get to Airbag24?

You send the unit 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 shock-proof.