Airbag control unit with part number 89170-42200

What does the airbag control unit 89170-42200 do?

As the central point of the restraint system (SRS) of Toyota, the airbag control unit 89170-42200 controls the airbags and seatbelt pretensioners. It processes the signals of the impact sensors and decides in an accident what is triggered; at the same time it monitors the system.

While driving, the unit works unobtrusively on. The monitoring covers sensors, cables and control circuits, and every fault it detects appears via the airbag warning light.

After an accident the unit keeps crash data and is locked afterwards.

Why does the control unit 89170-42200 fail?

Crash data that remains in the memory after an accident is the most common cause, even if no airbag has fired. An ordinary diagnostic tool does not remove it. Further triggers are aged electronics, cold solder joints, moisture and corrosion, as well as voltage spikes.

Crash data arises at the impact, regardless of whether an airbag triggers. It affects the diagnosis, because the control unit records the impact as an event. Airbag24 removes the crash data during the repair.

The other triggers are technical in nature. Electronics age, solder joints can stay cold, and moisture causes contacts to corrode. Voltage spikes arise, for example, with a weak battery or when a jump start is used, and they put a strain on the electronics.

Which cause applies to your unit is shown only by the check.

How can you tell that the 89170-42200 is defective?

A fault shows up when the airbag warning light in the instrument cluster lights up, error messages appear, the diagnostic tool finds no connection, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The light in the instrument cluster is the signal you see first. It shows that the system has detected a fault, and it should go out after the ignition is switched on; if it stays on, have the fault clarified.

Error messages and a missing connection to the diagnostic tool do not necessarily have the control unit as their cause. Plugs, cables or the power supply can also be responsible, and which of these applies is shown only by the read-out.

Which vehicles is the 89170-42200 fitted in?

This control unit from Toyota is fitted in these vehicles: Toyota RAV4 XA30 (2006-2009) and XA30 Facelift (2009-2013). The assignment applies to the part number stated.

The vehicles are listed below.

• Toyota RAV4 XA30 (2006-2009)
• Toyota RAV4 XA30 Facelift (2009-2013)

A comparison of the part number on the unit with this page shows whether the unit fits. Whether it is defective itself is revealed only by the fault memory, which you have read out before removal, because a plug or a cable can produce the same signs.

For the same vehicles, we also repair control units with the part numbers 150300-8850, 89170-0R022, 89170-0R140, 89170-42201, 89170-42210, 89170-42420.

How does the repair of the 89170-42200 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Afterwards create the repair order online and send the well-packed unit. At Airbag24, checking, repairing and the function test take 3–4 working days as a rule.

At the test bench, Airbag24 checks the control unit, replaces defective components, erases crash data and carries out a function test. The unit then goes back to you.

The order protects the vehicle during work. The time of 3–4 working days applies only to the work at Airbag24 and to none of your steps. 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 89170-42200 get to Airbag24?

You send the control unit 89170-42200 as a parcel or book a UPS collection. After the repair it comes back to you by UPS.

Print the repair order and place it in the parcel. Pack the unit shock-resistant.