Airbag control unit with part number 89170-48310

What does the airbag control unit 89170-48310 do?

The airbag control unit 89170-48310 forms the centre of the restraint system (SRS) of Toyota. It processes the signals from the crash sensors and, in a crash, decides within milliseconds which airbags and seatbelt pretensioners are triggered. At the same time it checks the system continuously and reports faults via the airbag warning light.

In everyday use the unit works unnoticed in the background. It must be ready at all times, because a decision cannot be made retroactively in an emergency.

After an accident the control unit stores crash data and locks itself.

Why does the control unit 89170-48310 fail?

Stored crash data is the most common cause. It remains in the unit after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Airbag24 deletes it during the repair.

Causes other than crash data are also possible:

• ageing electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 89170-48310 is defective?

A defect can show up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently, as a fault message, or as a diagnostic tool that cannot make contact with the control unit. A fault memory that cannot be cleared is also a sign.

• airbag warning light stays on permanently
• airbag warning light comes on only intermittently
• fault message in the instrument cluster
• diagnostic tool cannot find the control unit
• fault memory cannot be cleared

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. A check should therefore be carried out promptly.

Which vehicles is the 89170-48310 fitted in?

Part number 89170-48310 is used by Toyota. The control unit 89170-48310 is fitted in these vehicles: Toyota Highlander XU40 (2007-2013).

The vehicles for which we know this control unit are listed here.

• Toyota Highlander XU40 (2007-2013)

Have the fault memory read out before removal. Only then is it clear whether the control unit itself is faulty or whether a plug or a cable is causing the fault. Afterwards, compare the part number on the label with this page.

For the same vehicles, we also repair control units with the part numbers 89170-48090, 89170-48240.

How does the repair of the 89170-48310 work?

First you have the fault memory read out, attach the log and disconnect the battery. Then you remove the control unit, create a repair order online and pack the unit carefully for dispatch.

At Airbag24 the control unit is checked on the test bench, defective components are replaced, stored crash data is deleted and a function test is carried out. Processing usually takes 3–4 working days. The 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 89170-48310 get to Airbag24?

You send the control unit 89170-48310 in as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends the unit back by UPS after the repair.

Put the printed repair order in the parcel and pack the unit shockproof.