Airbag control unit with part number 89170-0E030

What does the airbag control unit 89170-0E030 do?

In Lexus vehicles, the airbag control unit 89170-0E030 controls the restraint system (SRS). It evaluates the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the entire system. If an accident occurs, it secures crash data and locks itself.

Monitoring extends to sensors, wiring and output stages. The unit indicates faults via the airbag warning light.

Why does the control unit 89170-0E030 fail?

The most common cause is crash data stored after an accident, even without a triggered airbag. Other causes include aged electronics, cold solder joints, moisture at connectors and voltage spikes.

Crash data remains in memory after the event. A standard diagnostic tool does not delete it; Airbag24 carries out the deletion during the repair.

• The electronics age and gradually lose reliability.
• Solder joints that are not properly made can lose contact.
• Moisture and corrosion at connectors impair signal transmission.
• Severe voltage fluctuations, for example from a weak battery, put strain on the components.

How can you tell that the 89170-0E030 is defective?

A defect shows up as the airbag warning light staying on permanently or flickering, as fault messages in the instrument cluster, as a diagnostic tool with no connection to the control unit, or as a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Pay attention to the following points:

• The airbag warning light stays on permanently or only flickers.
• A fault message appears in the instrument cluster.
• The diagnostic tool cannot reach the control unit.
• The fault memory cannot be emptied.

If you notice such signs, a prompt check is advisable, since they point to a fault in the restraint system.

Which vehicles is the 89170-0E030 fitted in?

The control unit 89170-0E030 is found in the following vehicles: Lexus RX AL10 Facelift (2012-2015) and AL10 (2009-2012).

Here is the list:

• Lexus RX AL10 Facelift (2012-2015)
• Lexus RX AL10 (2009-2012)

Comparing the number on the label with this page ensures that you have checked the right unit. Only the fault memory shows, however, what the cause is. Have it read out before removal, because a connector or a cable can produce similar symptoms.

For the same vehicles, we also repair control units with the part numbers 1503001853, 89170-48510, 89170-48520, 89170-48530, 89170-48540, 89170-48550.

How does the repair of the 89170-0E030 work?

Have the fault memory read out first; the log then goes into the package. Only after disconnecting the battery do you remove the control unit. Create the repair order online, then pack and send the unit.

At Airbag24, the unit is first placed on the test bench. Defective components are then replaced and the crash data deleted. Everything is completed with a function test. Airbag24 typically allows 3–4 working days for this.

The sequence serves safety around the airbag system. 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 89170-0E030 get to Airbag24?

You send the unit to Airbag24 as a package, or you book a UPS collection for an extra charge. UPS takes care of the return after the repair.

The printed repair order belongs in the package. Make sure the control unit is packed to withstand knocks.