Airbag control unit with part number 89170-33540

What does the airbag control unit 89170-33540 do?

The airbag control unit 89170-33540 coordinates the restraint system (SRS) of Toyota and Lexus. It evaluates the signals from the crash sensors and determines in an accident which airbags and seatbelt pretensioners are triggered within milliseconds.

It also monitors the entire system. If it detects a fault, it reports it via the airbag warning light and stores it in the fault memory.

After an accident the unit stores crash data and locks itself. It is a central building block of safety technology, and any deviation at this point has consequences for the entire system.

Why does the control unit 89170-33540 fail?

Stored crash data is the most common cause with the 89170-33540, even where no airbag was triggered. Added to this are aged electronics, cold solder joints, moisture with corrosion on plug connectors, and voltage spikes.

Crash data of this kind cannot be erased with a normal diagnostic tool. A fault can therefore remain in the control unit even when no damage can be seen on the vehicle any more.

The other causes work through ageing and environmental influences. Electronic components age, solder joints can stay cold, moisture and rust attack plug connectors, and voltage spikes put additional load on the electronics.

How can you tell that the 89170-33540 is defective?

An airbag warning light in the instrument cluster that lights up permanently or intermittently indicates a defect in the 89170-33540. In addition there are error messages in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared.

The condition can therefore be recognised from these symptoms alone. In an emergency, airbags and seatbelt pretensioners may possibly not trigger, and this situation calls for a prompt check.

Which vehicles is the 89170-33540 fitted in?

The airbag control unit 89170-33540 is fitted in these vehicles: Toyota Camry XV40 (2006-2011); Lexus ES GSV40 Facelift (2009-2012) and GSV40 (2006-2009).

The list here names the affected models.

• Toyota Camry XV40 (2006-2011)
• Lexus ES GSV40 Facelift (2009-2012)
• Lexus ES GSV40 (2006-2009)

A label comparison with this page only tells you about the identity of the unit. Whether the control unit itself is defective or a plug or cable is responsible is answered only by a fault memory read-out, which you should have carried out before removal.

For the same vehicles, we also repair control units with the part numbers 150300-3243, 89170-06A40, 89170-33570, 89170-33571, 89170-33580, 89170-33660.

How does the repair of the 89170-33540 work?

Testing, repair and function check of the 89170-33540 at Airbag24 usually take 3–4 working days. On your side the process begins with reading out the fault memory and attaching the log, followed by disconnecting the battery and removing the unit. Only then do you create a repair order online and send the unit in.

The sequence serves safety: the control unit is removed only once the battery is disconnected.

At Airbag24 the unit is tested on the test bench, defective components are replaced, stored crash data is erased, and a function test concludes the work. Your unit is then returned.

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 89170-33540 get to Airbag24?

For sending in the 89170-33540 you choose a parcel or a UPS collection, which you book for an extra charge. After the repair the unit goes back to you by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-proof.