Airbag control unit with part number 89170-08070

What does the airbag control unit 89170-08070 do?

In the vehicle of Toyota, the airbag control unit 89170-08070 forms the central switching unit of the SRS restraint system. It collects the data from the crash sensors, evaluates it within milliseconds and then controls which airbags and seatbelt pretensioners fire.

The condition of the system is monitored continuously, and faults appear via the airbag warning light. If the vehicle is involved in an accident, the control unit stores the crash data and locks itself. Only a repair can lift this lock.

In everyday use the switching unit goes unnoticed as long as all values are correct. A warning of a fault should therefore always be taken seriously.

Why does the control unit 89170-08070 fail?

Usually the cause is crash data left in the memory after an accident, even if no airbag was triggered. Such data cannot be removed with commercially available tools, and the fault remains.

A second group of causes is aged electronic components and cold solder joints. Both can lead to malfunctions over time, even without any accident.

Moisture and corrosion at the plug connectors also count, as do voltage spikes from a weak battery or a jump start.

How can you tell that the 89170-08070 is defective?

A defect becomes noticeable when the airbag warning light in the instrument cluster stays on permanently or intermittently. Added to this are error messages in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

In such a case the diagnostic tool does not find the control unit, and that is a serious warning sign. In an emergency, airbags and seatbelt pretensioners may fail to deploy, so a prompt check is worthwhile.

Which vehicles is the 89170-08070 fitted in?

The control unit 89170-08070 is fitted in these vehicles: Toyota Sienna XL20 (2004-2005) and XL20 Facelift (2006-2010).

This assignment comes from our records and looks as follows.

• Toyota Sienna XL20 (2004-2005)
• Toyota Sienna XL20 Facelift (2006-2010)

Have the fault memory read out before you remove the unit. Afterwards compare the part number on the label of the removed unit with the list, to make sure that the control unit itself or a plug or cable is not the actual cause.

For the same vehicles, we also repair control units with the part numbers 89170-08140, 89170-08170, 89170-08230.

How does the repair of the 89170-08070 work?

Begin by having the fault memory read out and enclose the log with the unit. Then disconnect the battery, remove the control unit and create a repair order online before you send it in. At Airbag24 processing generally takes 3–4 working days.

In-house, the unit is first examined on the test bench, then defective components are repaired. The crash data is removed and a functional test completes the work. This time frame refers exclusively to the work at Airbag24 and covers neither your steps nor shipping. Your own unit then comes 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 89170-08070 get to Airbag24?

You either send the unit in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

Enclose the printed repair order, and pack the unit shock-proof.