Airbag control unit with part number 89170-48340

What does the airbag control unit 89170-48340 do?

The airbag control unit 89170-48340 runs the restraint system (SRS) in Toyota vehicles. It evaluates the crash sensor signals, decides within milliseconds in an accident whether airbags and seatbelt pretensioners fire, and reports faults via the airbag warning light.

During operation it monitors all components of the system and records deviations in the fault memory.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-48340 fail?

The most common cause is crash data stored after an accident, even if no airbag deployed; a standard diagnostic tool cannot remove it. Other causes are ageing, cold solder joints, moisture at connectors and voltage spikes.

The following points may apply:

• Aged electronic components
• Cold solder joints on the circuit board
• Moisture and corrosion at plug connections
• Voltage spikes from a weak battery or a jump start

Only an inspection of the unit shows which point applies.

How can you tell that the 89170-48340 is defective?

The airbag warning light stays on permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool cannot establish a connection with the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light is therefore a clear prompt to have the system checked.

Which vehicles is the 89170-48340 fitted in?

This assignment applies to exactly this part number. The airbag control unit 89170-48340 is fitted in these vehicles: Toyota Highlander XU40 (2007-2013).

The list shows which vehicles are on file.

• Toyota Highlander XU40 (2007-2013)

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 before removal. Only the result shows whether the control unit is faulty or whether a connector or cable is the cause.

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

How does the repair of the 89170-48340 work?

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

Airbag24 checks the unit on the test bench, replaces faulty components, erases the crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days and covers only inspection, repair 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 89170-48340 get to Airbag24?

You either send the unit in as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Put the printed repair order in the parcel and pack the control unit shock-resistant.