Airbag control unit with part number 89170-48E10

What does the airbag control unit 89170-48E10 do?

The airbag control unit 89170-48E10 forms the switching centre of the restraint system (SRS) of Toyota in the vehicle. It reads the signals from the crash sensors, determines in an accident within fractions of a second which airbags and seatbelt pretensioners fire, and checks the system continuously for faults.

A detected fault is shown by the control unit via the airbag warning light. After an accident it stores crash data and locks itself. The repair lifts this lock.

Precisely because the system tolerates no delay in an emergency, the electronics work constantly in the background.

Why does the control unit 89170-48E10 fail?

Stored crash data from an accident is the most common cause at the 89170-48E10, even if no airbag has deployed, and an ordinary diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data is created in the control unit itself, regardless of whether an airbag fired. That is why this point is relevant even when no seatbelt pretensioner and no airbag triggered in an incident.

Ageing components lose reliability over the years. Cold solder joints can lose contact at times, and moisture with corrosion damages the plug connections. Voltage spikes, for example from a jump start or a weak battery, strain the electronics.

How can you tell that the 89170-48E10 is defective?

The airbag warning light in the instrument cluster lights permanently or at times in the event of a defect on the 89170-48E10. A fault message appears in the instrument cluster, the diagnostic tool cannot connect to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The warning light reports the fault itself and is therefore the most reliable indication the vehicle offers. It does not light up without reason.

A diagnostic tool that cannot establish contact points to a fault in the control unit or its connection. A check clarifies where exactly the fault lies.

Which vehicles is the 89170-48E10 fitted in?

The following information is based on the part number. The control unit 89170-48E10 is fitted in these vehicles: Toyota Harrier XU80 (from 2020).

The assignment in detail:

• Toyota Harrier XU80 (from 2020)

Comparing the part number on the label of the removed unit with this page merely confirms that it is the correct unit. Whether the control unit itself is defective is shown only by the fault memory, which must be read out before removal.

For the same vehicles, we also repair control units with the part numbers 89170-0E330.

How does the repair of the 89170-48E10 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit 89170-48E10. Next create a repair order online and pack the unit well before sending it. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is checked, defective components are replaced and the stored crash data is erased. Finally a function test is carried out, after which your own unit goes back 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 89170-48E10 get to Airbag24?

You can send the control unit 89170-48E10 as a parcel, or book a UPS collection for an extra charge. After repair Airbag24 sends it back to you by UPS.

Place the printed repair order in the parcel and pack the unit shock-proof.