Airbag control unit with part number 89170-53190

What does the airbag control unit 89170-53190 do?

The 89170-53190 controls the restraint system (SRS) in vehicles from Lexus. It checks the crash sensors continuously and, in a crash, triggers the appropriate airbags and seatbelt pretensioners within milliseconds.

During operation the unit evaluates the sensor data and monitors all connections of the system. If it detects a fault, it reports it via the airbag warning light.

A crash can also cause the unit to store crash data and lock itself.

Why does the control unit 89170-53190 fail?

The most common cause is crash data stored in the 89170-53190 after an accident, even if no airbag was triggered. Other possible causes are aged components, cold solder joints, moisture and corrosion at connectors, and voltage spikes.

• aged components in the electronics
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

Crash data cannot be erased with a standard diagnostic tool. Airbag24 erases it during the repair.

How can you tell that the 89170-53190 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition there is a fault message in the instrument cluster, and the diagnostic tool cannot establish a connection to the 89170-53190. A fault memory that cannot be cleared also belongs to this picture.

While these signs persist, it can happen in an emergency that the airbags and seatbelt pretensioners do not trigger.

Only reading out the fault memory clarifies whether the control unit itself is affected. A plug or a cable can also cause the same symptoms.

Which vehicles is the 89170-53190 fitted in?

The 89170-53190 is fitted in these vehicles: Lexus IS XE20 (2005-2009) and XE20 Facelift (2010-2013).

Here follows the list of vehicles to which this part number is assigned.

• Lexus IS XE20 (2005-2009)
• Lexus IS XE20 Facelift (2010-2013)

Compare the part number on the label of the removed unit with this page, and then you know it is the correct unit. Also have the fault memory read out, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-53110, 89170-53480, 89170-53490, 89170-53540, 89170-53560, 89170-53570.

How does the repair of the 89170-53190 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, only after that remove the 89170-53190, create a repair order online and send the unit in, well packed.

On the test bench, Airbag24 examines the unit, repairs defective components, erases the crash data and carries out a function test. You then receive your own unit back.

Checking, repairing and testing at Airbag24 usually takes 3–4 working days. 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 89170-53190 get to Airbag24?

Either you send the 89170-53190 yourself as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the repaired unit back to you by UPS.

Pack the printed repair order into the parcel and pack the unit shock-proof.