Airbag control unit with part number 89170-42690

What does the airbag control unit 89170-42690 do?

As the airbag control unit, the 89170-42690 controls the restraint system (SRS) in Toyota. In a crash it calculates from the sensor data which airbags and seatbelt pretensioners to trigger, and this happens within milliseconds. It monitors the condition of the system continuously.

The impact sensors send their signals to the unit, which evaluates this data. It reports faults in the system via the airbag warning light.

If it stores crash data after an accident, it locks itself.

Why does the control unit 89170-42690 fail?

Crash data stored after an accident is considered the most common cause on the 89170-42690, even without an airbag deployment; a standard diagnostic tool cannot erase it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from jump-starting.

The fact that no airbag was deployed does not rule out their storage.

Aged components and cold solder joints only show themselves once a load is added.

Moisture and corrosion attack plug contacts. Voltage spikes, for example with a weak battery, stress the electronics.

How can you tell that the 89170-42690 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently on the 89170-42690. The instrument cluster also shows an error message, the diagnostic tool does not reach the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners could then possibly not deploy in an emergency.

The light is a direct sign of a fault, not an incidental finding.

Even if the vehicle can still be driven, a prompt check of the system is advisable.

Which vehicles is the 89170-42690 fitted in?

The 89170-42690 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018). Please check whether your model is affected before you remove the unit.

These vehicles are known to us for this part number:

• Toyota RAV4 XA50 (from 2018)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Whether the control unit is defective is shown only by the fault memory read out beforehand; it also reveals whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 150800-4431, 152100-0262, 152100-4560, 89170-0R070, 89170-0R090, 89170-0R091.

How does the repair of the 89170-42690 work?

For the 89170-42690, have the fault memory read out first and enclose the log. Then disconnect the battery, and only then remove the control unit. Next, create a repair order online and send in the well-packed unit; processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the unit is checked on the test bench, defective components are repaired, the crash data is erased and a function test is performed. Your own unit is then sent back to you.

The stated time only applies to checking, repairing and testing at Airbag24. 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 89170-42690 get to Airbag24?

You send the control unit 89170-42690 yourself as a parcel, or you book a UPS collection for an extra charge. After the repair it reaches you again by UPS.

The printed repair order must be in the parcel, and the packaging should be shock-resistant.