Airbag control unit with part number 89170-33520

What does the airbag control unit 89170-33520 do?

The airbag control unit 89170-33520 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals of the crash sensors and in an accident decides within milliseconds which airbags and seatbelt pretensioners fire. It reports faults in the system via the airbag warning light.

While the vehicle is driving, the unit continuously monitors sensors, wiring and actuators. A detected fault is stored in the fault memory and shown to the driver, so that the workshop can search for the cause in a targeted way.

After an accident the control unit stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 89170-33520 fail?

The most common cause: crash data stored after an accident, even if no airbag has deployed. Ordinary diagnostic tools cannot erase this data. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

That the airbags stayed silent does not mean nothing was stored in the control unit. The data remains there until it is deliberately removed.

The other causes show up gradually. A plug contact affected by moisture first causes intermittent faults before it fails completely, and a voltage spike, for example from a weak battery or jump-starting, can damage components in the unit.

How can you tell that the 89170-33520 is defective?

Typical signs are an airbag warning light in the instrument cluster that stays on constantly or at times, and a fault message in the instrument cluster. In addition the diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared.

The following points stand out in detail:

• airbag warning light stays on constantly or at times
• fault message in the instrument cluster
• diagnostic tool without connection to the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may fail to deploy if there is a defect. Have the indication checked promptly.

Which vehicles is the 89170-33520 fitted in?

The 89170-33520 is fitted in these vehicles: Toyota Camry XV40 (2006-2011). The details apply to Toyota.

The vehicles in which this unit occurs are listed here:

• Toyota Camry XV40 (2006-2011)

Compare the part number on the label of the removed unit with this page. That only ensures it is the correct unit. Have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-06A40.

How does the repair of the 89170-33520 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 the repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and performs a function test. Processing at Airbag24 usually takes 3–4 working days. After that your own unit comes back 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 89170-33520 get to Airbag24?

You send the unit as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

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