Airbag control unit with part number 89170-42382

What does the airbag control unit 89170-42382 do?

For Toyota, the airbag control unit 89170-42382 is the central control unit of the restraint system (SRS). In a crash it evaluates the signals from the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are triggered.

The system monitors the unit continuously. If it detects a fault, it shows this via the airbag warning light in the instrument cluster, so that you notice the malfunction.

After an accident the unit stores crash data and locks itself. The following sections describe the causes, the signs and the route to repair.

Why does the control unit 89170-42382 fail?

Stored crash data from an accident is the most common cause, even if no airbag has deployed; a normal diagnostic tool cannot erase it. In addition, ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes come into consideration.

The crash data is created in the unit without an airbag having to fire. That is why the fault memory is the first point of reference, not the question of whether a deployment took place.

Ageing components, cold solder joints and corrosion at plug connections impair the electronics. Voltage spikes arise, for example, with a weak battery or when jump-starting.

How can you tell that the 89170-42382 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and through a fault message in the instrument cluster. Add to this connection problems with the diagnostic tool and a fault memory that cannot be cleared.

Typical signs at a glance:

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool gets no connection to the control unit
• Fault memory cannot be cleared

If such signs are present, airbags and seatbelt pretensioners may not be able to trigger in an emergency. A prompt check is therefore sensible.

Which vehicles is the 89170-42382 fitted in?

The control unit 89170-42382 is fitted in these vehicles: Toyota RAV4 XA30 (2006-2009) and XA30 Facelift (2009-2013).

In the following directory you will see the vehicles that are stored for this control unit.

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

Comparing the part number with the label on the removed unit only confirms that it is the right unit. Before that, have the fault memory read out, because only that 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 150300-8850, 89170-0P010, 89170-0P020, 89170-0P030, 89170-0P040, 89170-0P050.

How does the repair of the 89170-42382 work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit and create a repair order online. Airbag24 usually needs 3–4 working days for checking, repairing and testing.

The unit is then sent in, well packed. Airbag24 checks it on the test bench, repairs defective components, erases stored crash data and carries out a function test; the unit is then returned 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 89170-42382 get to Airbag24?

You can send the control unit 89170-42382 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel. Pack the unit shockproof.