Airbag control unit with part number 89170-53040

What does the airbag control unit 89170-53040 do?

The airbag control unit 89170-53040 belongs to the restraint system (SRS) of Lexus and controls its airbags and seatbelt pretensioners. It records the crash sensors, decides on triggering within milliseconds in the event of an impact, and monitors the entire system.

During operation, the unit checks the system continuously. If it detects a fault, it displays this via the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-53040 fail?

Crash data from an accident is the most common cause, even if no airbag was triggered. Other causes are ageing components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data cannot be erased with an ordinary diagnostic tool, so it remains in the unit. The other causes concern electronics, contacts and the power supply. Only an examination of the unit shows which of them applies.

How can you tell that the 89170-53040 is defective?

The airbag warning light in the instrument cluster is the most important sign: it lights up permanently or intermittently when a defect is present. In addition, there may be a fault message in the instrument cluster, no connection to the diagnostic tool, or a fault memory that cannot be cleared.

If there is such a defect, airbags and seatbelt pretensioners may not trigger in an emergency. Checking the warning light is therefore part of the regular inspection of the vehicle.

Which vehicles is the 89170-53040 fitted in?

This control unit is fitted in Lexus vehicles. It is found in the following vehicles: Lexus IS XE10 (1998-2001) and XE10 Facelift (2001-2005).

The vehicles are listed here:

• Lexus IS XE10 (1998-2001)
• Lexus IS XE10 Facelift (2001-2005)

Check the part number on the label of the removed unit against this page. This only tells you whether it is the right unit. Have the fault memory read out before removal, because only the result shows whether the control unit itself is defective or whether a plug or cable is the cause.

How does the repair of the 89170-53040 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery and remove the control unit, then create a repair order online.

Then send the well-packed unit in. At Airbag24, the unit is checked on the test bench, defective components are repaired, stored crash data is erased and a function test is carried out. Processing usually takes 3–4 working days at Airbag24.

Afterwards your own 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 89170-53040 get to Airbag24?

You can send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order goes into the parcel; pack the control unit shockproof.