Airbag control unit with part number 89170-33D50

What does the airbag control unit 89170-33D50 do?

The airbag control unit 89170-33D50 is the central control unit of the restraint system (SRS) in Lexus. It checks the signals from the crash sensors and, in a crash, decides within a fraction of a second which airbags and seatbelt pretensioners to trigger. After an accident it stores crash data and locks itself; only the repair lifts this lock.

It also continuously monitors all connected components, and faults are reported via the airbag warning light.

Precisely because it combines several functions, a defect affects the entire restraint system.

Why does the control unit 89170-33D50 fail?

The most common cause is stored crash data, which arises after an accident even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are aged components and cold solder joints.

Moisture and corrosion at plug connections impair the contact and can disrupt the function.

Voltage spikes, for example from a weak battery or a jump start, place additional stress on the electronics.

How can you tell that the 89170-33D50 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the system detects a fault. In addition, the instrument cluster shows a fault message, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

This is not a detail to be clarified in passing, but a warning about the safety function. You should therefore have the warning checked promptly.

Which vehicles is the 89170-33D50 fitted in?

The airbag control unit 89170-33D50 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

Here is the assignment:

• Lexus ES AXZH60 (from 2018)

Before removal, compare the part number on the device label with this page; this ensures it is the correct unit. The result for the cause of the defect comes only from the fault memory. Have it read out beforehand, so that it becomes clear 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 89170-06820, 89170-06850, 89170-06880, 89170-33B90, 89170-33C30, 89170-33C50.

How does the repair of the 89170-33D50 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. Then create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. The unit is then returned to you.

Processing at Airbag24 usually takes 3–4 working days. This period applies only to checking, repairing and testing there.

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 89170-33D50 get to Airbag24?

A parcel brings the unit to Airbag24, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS. The printed repair order goes into the parcel, and the unit is packed shockproof.

Sturdy packaging with enough padding protects the unit from transport damage.