Airbag control unit with part number 89170-42A00

What does the airbag control unit 89170-42A00 do?

The airbag control unit 89170-42A00 takes over the control of the SRS restraint system for Toyota. It evaluates the signals from the crash sensors and determines in an accident which airbags and seatbelt pretensioners are triggered.

During operation it checks the system, and faults are indicated via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. The lock is only lifted by a repair.

Why does the control unit 89170-42A00 fail?

Crash data stored after an accident is considered the most common cause, even if no airbag was triggered. A normal diagnostic tool does not remove it from the 89170-42A00. Aged components, cold solder joints, moisture at plug connections and voltage spikes are also involved.

Airbag24 erases the crash data during the repair, so you do not need to prepare anything for this.

The other triggers arise over time or through external influences. Components age, solder joints can go cold, and damp or corrosion harm plug connections. Voltage spikes from a weak battery or a jump start round off the picture.

How can you tell that the 89170-42A00 is defective?

A defect on the 89170-42A00 becomes visible through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Fault messages or a diagnostic tool without a connection to the control unit also point to it.

The signs at a glance:

• airbag warning light in the instrument cluster, permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool without a connection
• fault memory that cannot be cleared

In a crash, airbags and seatbelt pretensioners may not trigger. Therefore have the system checked.

Which vehicles is the 89170-42A00 fitted in?

The airbag control unit 89170-42A00 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018). For comparison, take the part number from the label of the removed unit.

The assignment to vehicles is shown in this list:

• Toyota RAV4 XA50 (from 2018)

Comparing the label only confirms the correct unit, and nothing more. Have the fault memory read out in advance as well, because whether the control unit is defective or a plug or cable is the cause is shown only by the record.

For the same vehicles, we also repair control units with the part numbers 150800-4431, 152100-0262, 152100-4560, 89170-42400, 89170-42870, 89170-42A60.

How does the repair of the 89170-42A00 work?

You begin by reading out the fault memory and enclose the record. Then you disconnect the battery, remove the control unit 89170-42A00 and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Pack the unit well before you send it in.

Airbag24 checks the unit on the test bench, replaces defective components, removes the crash data and tests the function. 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 89170-42A00 get to Airbag24?

The control unit 89170-42A00 reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair it is returned to you by UPS.

The printed repair order belongs in the parcel, and the unit is packed shock-resistant.