Airbag control unit with part number 89170-42D11

What does the airbag control unit 89170-42D11 do?

In the Toyota, the airbag control unit 89170-42D11 controls the restraint system (SRS). It evaluates the signals from the crash sensors, determines the triggering of the airbags and seatbelt pretensioners in an emergency, and monitors the system continuously. Faults are shown via the airbag warning light.

In the event of an impact, the unit compares the measured values with stored criteria and selects the suitable restraint devices. This happens within fractions of a second.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 89170-42D11 fail?

The most common cause is crash data stored after an accident, even if no airbag was deployed. A standard diagnostic tool cannot erase it. In addition, aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes may be responsible.

The stored crash data remains in the unit until Airbag24 removes it during repair. Until then, the message may continue to appear in the vehicle.

The other causes also occur without an accident. Damp connectors or cold solder joints lead to loose contacts, and voltage spikes when starting or from a jump start add further strain to the electronics.

How can you tell that the 89170-42D11 is defective?

The airbag warning light in the instrument cluster lights up permanently or only intermittently, an error message appears in the instrument cluster, the diagnostic tool receives no connection to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then not deploy in an emergency.

The warning light gives the clearest indication. When the ignition is switched on, it lights up briefly and goes out again; this is the normal self-test. If it stays on afterwards, there is a finding that you should have checked.

Which vehicles is the 89170-42D11 fitted in?

The airbag control unit 89170-42D11 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018). Whether your car is among them can be clarified before removal. Matching the part number alone is not enough for that.

The affected vehicles at a glance:

• Toyota RAV4 XA50 (from 2018)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit. The fault memory should be read out beforehand. The result shows whether the control unit itself is defective or whether a connector or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 150800-4431, 152100-0262, 152100-4560, 89170-42400, 89170-42870, 89170-42A60.

How does the repair of the 89170-42D11 work?

First have the fault memory read out 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. Airbag24 needs 3–4 working days for testing, repair and functional test as a rule.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a functional test. The unit then goes 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 89170-42D11 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the control unit shockproof.