Airbag control unit with part number 89170-35510

What does the airbag control unit 89170-35510 do?

The airbag control unit 89170-35510 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

If the unit detects a fault, this is shown via the airbag warning light in the instrument cluster. This allows the state of the system in the vehicle to be checked at any time.

After an accident, the control unit stores crash data and locks itself. Further details on this lock do not belong to the functional description.

Why does the control unit 89170-35510 fail?

The most common cause is stored crash data after an accident, even without triggered airbags; a normal diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is created in the unit after an accident, and the diagnostic tool cannot remove it. Fault finding becomes more laborious, because this entry remains.

Aged components and cold solder joints are typical weak points of electronic assemblies. Moisture and corrosion at plug connections lead to unstable contacts.

Voltage spikes act on the electronics, for example when the battery is weak or the vehicle is started with a jump start.

How can you tell that the 89170-35510 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the display. In addition, no connection from the diagnostic tool to the control unit can be established, and the fault memory cannot be cleared.

The warning light is the display through which the control unit signals a defect. It stays on for as long as the fault is present.

In an emergency, airbags and seatbelt pretensioners may fail to deploy. Therefore, you should follow up on the warning and have the cause clarified.

Which vehicles is the 89170-35510 fitted in?

The 89170-35510 is fitted in these vehicles: Toyota Tacoma N300 (2015-2019) and N300 Facelift (2019-2023).

The vehicles listed in our data for this number are shown here:

• Toyota Tacoma N300 (2015-2019)
• Toyota Tacoma N300 Facelift (2019-2023)

Comparing the part number on the label of the removed unit with this page only ensures that you have the right unit. Also have the fault memory read out before you remove anything, because only this 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 89170-04661, 89170-04671, 89170-04680, 89170-04690, 89170-04700, 89170-04720.

How does the repair of the 89170-35510 work?

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

At Airbag24, the unit is examined on the test bench, defective components are replaced, stored crash data is erased and a function test is carried out. Processing usually takes 3–4 working days at Airbag24.

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 89170-35510 get to Airbag24?

You send the unit in as a parcel or book a UPS pickup for an extra charge. After the repair, UPS brings the unit back to you.

Put the printed repair order into the parcel and pack the control unit shock-proof.