Airbag control unit with part number 89170-48360

What does the airbag control unit 89170-48360 do?

The airbag control unit 89170-48360 controls the restraint system (SRS) in Toyota. In an accident it processes the data from the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are triggered. It continuously monitors the system and reports faults via the airbag warning light.

The control unit works in the background, possibly without you noticing. It checks the wiring and the power supply and records detected faults in the fault memory, so that they become visible later.

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

Why does the control unit 89170-48360 fail?

The most common cause is crash data from an accident, even if no airbag was triggered. Further causes include ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

• electronic components that age over time
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or after a jump start

Crash data cannot be erased with a normal diagnostic tool, so the display remains. The other causes concern the condition of the electronics and their connections. Moisture and ageing can reinforce each other.

How can you tell that the 89170-48360 is defective?

The airbag warning light in the instrument cluster lights up intermittently or continuously. In addition there is an error message in the instrument cluster, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared.

If any of these signs becomes noticeable, airbags and seatbelt pretensioners may in an emergency not trigger. The warning light shows the fault, and that is its purpose.

In everyday driving you see the light in the instrument cluster every time the ignition is switched on.

Which vehicles is the 89170-48360 fitted in?

The 89170-48360 is fitted at Toyota in these models: Toyota Highlander XU40 (2007-2013).

The following list shows the assignment in detail.

• Toyota Highlander XU40 (2007-2013)

Comparing the part number on the label with this page makes sure that you have the right unit in your hands. It makes no statement about the cause. For that, the fault memory must be read out beforehand, because only it shows whether the control unit is defective or whether a plug or cable is causing the fault.

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

How does the repair of the 89170-48360 work?

First have the fault memory read and attach the log; then disconnect the battery and only then remove the control unit. Afterwards create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

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

The order of steps is binding for safety reasons.

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 89170-48360 get to Airbag24?

You send the unit as a parcel, or you book a UPS collection for an extra charge, and after the repair it comes back to you by UPS.

The printed repair order and a shock-resistant protective packaging for the unit must not be missing from the parcel.