Airbag control unit with part number 89170-53620

What does the airbag control unit 89170-53620 do?

The airbag control unit 89170-53620 carries out the evaluation of the restraint system (SRS) in Lexus. It detects a crash using the crash sensors, determines which airbags and seatbelt pretensioners respond, and monitors the entire system. If it detects a fault, this is shown via the airbag warning light.

Alongside the evaluation, continuous monitoring runs that keeps an eye on connections and sensors. This keeps the system ready for use in an emergency.

After a crash, the unit stores crash data and locks itself.

Why does the control unit 89170-53620 fail?

The most common cause is crash data stored in the unit after an accident, even if no airbag was triggered. A normal diagnostic tool cannot remove this data. Other causes that may apply are aged components, cold solder joints, moisture at plug connections and voltage spikes.

Electronic components age over time, and solder joints from manufacture can come loose. Moisture and corrosion attack the contacts.

A weak battery or a jump start creates voltage spikes that can damage the unit. Which cause applies in an individual case is established by the examination.

How can you tell that the 89170-53620 is defective?

A defect in the control unit 89170-53620 first shows up at the airbag warning light in the instrument cluster, when it stays on permanently or intermittently. Accompanying this may be a fault message, a failed connection of the diagnostic tool and a fault memory that cannot be cleared.

The airbag warning light is in the instrument cluster and is the central warning signal of the system. If it lights up, there is a problem with the system that must be checked.

A diagnostic tool that cannot establish a connection to the control unit is a further sign. In an emergency, airbags and seatbelt pretensioners may not trigger.

Which vehicles is the 89170-53620 fitted in?

The control unit 89170-53620 is fitted in these vehicles: Lexus IS XE30 Facelift (2016-2020) and XE30 (2013-2016). Only the part number counts for the assignment.

Here are the assigned vehicles:

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

The part number is printed on the label of the removed unit; compare it with this page to make sure you have the correct unit. Also have the fault memory read out before removal, because only this result shows whether the control unit is defective or whether a connector or cable is the cause.

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 89170-53620 work?

Have the fault memory read out and the log attached to the unit, then disconnect the battery and remove the control unit 89170-53620. Next create a repair order online, and pack the unit well and send it in. Processing at Airbag24 normally takes 3–4 working days.

At Airbag24 a technician checks the unit on the test bench, repairs defective components 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 89170-53620 get to Airbag24?

Two routes lead to Airbag24: you send the unit 89170-53620 as a parcel, or you have it collected by UPS for an extra charge. After the repair it comes back to you by UPS.

Enclose the printed repair order in the parcel, and pack the unit so that it arrives shock-proof.