Airbag control unit with part number 89170-0E451

What does the airbag control unit 89170-0E451 do?

The airbag control unit 89170-0E451 is the central control unit of the restraint system (SRS) of Toyota. It evaluates the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system constantly.

Faults are shown by the airbag warning light in the instrument cluster, so that the fault does not go unnoticed.

After an accident, the unit stores crash data and locks itself. There is nothing more to explain about this function.

Why does the control unit 89170-0E451 fail?

The most common cause is crash data from an accident, even without a triggered airbag; a normal diagnostic tool cannot erase it. The further causes at a glance:

Crash data is the most frequent reason, because the unit records an impact even when no airbag was triggered.

• Aged electronic components that lose function over time.
• Cold solder joints that interrupt the current flow.
• Moisture and corrosion at plug connections.
• Voltage spikes, for example from a weak battery or a jump-start.

Which of these causes applies is only shown by an examination in the individual case.

How can you tell that the 89170-0E451 is defective?

You can recognise a defect in the 89170-0E451 by the airbag warning light in the instrument cluster staying on permanently or intermittently. Also present may be a fault message in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light reports the fault directly and stays on for as long as it exists. That makes it the most important indicator.

A fault memory that cannot be reset suggests that the cause lies deeper and needs a specialist examination.

Which vehicles is the 89170-0E451 fitted in?

The control unit 89170-0E451 is fitted in these vehicles: Toyota Highlander XU70 (from 2019). You can check whether your car is among them from the vehicle details in the registration document.

The affected vehicles are listed here:

• Toyota Highlander XU70 (from 2019)

Before removal, there are two important steps. (a) Comparing the part number on the label of the unit with this page only confirms that you have the right unit. (b) Having the fault memory read out beforehand 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 89170-0E690.

How does the repair of the 89170-0E451 work?

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

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, the unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days, and this period covers only checking, repairing and testing in the house.

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 89170-0E451 get to Airbag24?

You send the control unit 89170-0E451 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

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