Airbag control unit with part number 89170-53670

What does the airbag control unit 89170-53670 do?

The airbag control unit 89170-53670 is the central unit of the restraint system (SRS) in Lexus. It processes the readings from the crash sensors, decides within milliseconds in an accident on the triggering of airbags and seatbelt pretensioners, and monitors the system during operation. Any faults it finds are shown via the airbag warning light.

After an accident, the control unit stores crash data and locks itself. Since all sensor signals converge there, it is decisive for the safety of the entire system.

Depending on the vehicle, the means it controls include airbags in various positions and the seatbelt pretensioners.

Why does the control unit 89170-53670 fail?

The most common cause for 89170-53670 is the crash data stored after an accident, even if no airbag has deployed. Added to this are aged electronic components, cold solder joints, moisture and corrosion at connectors, and voltage spikes, for example from a weak battery or a jump start.

Crash data cannot readily be deleted with a standard diagnostic tool. Airbag24 deletes it during the repair.

The other causes cannot be reliably told apart from the outside, which is why reading the fault memory is the starting point for clarifying the issue.

How can you tell that the 89170-53670 is defective?

On 89170-53670, a defect first shows up as the airbag warning light in the instrument cluster, when it is on permanently or intermittently. Fault messages, a missing connection from the diagnostic tool to the control unit, and a fault memory that cannot be cleared are added. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light is the direct display of the system on the dashboard and stays visible as long as the fault is stored. It also reports faults that occur only intermittently.

A fault memory read narrows down the display afterwards.

Which vehicles is the 89170-53670 fitted in?

The airbag control unit 89170-53670 is fitted in these vehicles: Lexus IS XE30 Facelift (2016-2020) and XE30 (2013-2016).

The assigned models are listed below.

• Lexus IS XE30 Facelift (2016-2020)
• Lexus IS XE30 (2013-2016)

First compare the part number on the label of the removed unit with this page. This only shows that it is the correct unit, not whether it is defective. So have the fault memory read out beforehand, because its result shows whether the control unit itself is affected or whether a connector or a cable is.

For the same vehicles, we also repair control units with the part numbers 89170-53250, 89170-53370, 89170-53700.

How does the repair of the 89170-53670 work?

Before removal, have the fault memory read out and attach the log. Then disconnect the battery and remove control unit 89170-53670; afterwards create a repair order online and send in the well-packed unit. Testing, repair and function test at Airbag24 usually take 3–4 working days.

On the test bench, Airbag24 replaces defective components, deletes stored crash data and tests the function. Afterwards, your own, repaired unit is 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 89170-53670 get to Airbag24?

You decide how control unit 89170-53670 reaches Airbag24: you send it as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Pack the unit shockproof and enclose the printed repair order.