Airbag control unit with part number 89170-04290

What does the airbag control unit 89170-04290 do?

The airbag control unit 89170-04290 is the central control unit of the restraint system (SRS) of Toyota. It evaluates signals from the crash sensors, determines in an accident within fractions of a second which airbags and seatbelt pretensioners to trigger, and monitors the system continuously.

The control unit constantly checks the connections and actuators. A detected fault is shown via the airbag warning light in the instrument cluster, so you know immediately that the system needs attention.

After an accident the unit stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 89170-04290 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; normal diagnostic tools cannot clear it. Added to this are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, such as from a weak battery or a jump start.

The crash data stays stored in the unit's memory. An ordinary diagnostic scanner cannot remove it.

The other triggers lie in the electronics. Components age, solder joints can go cold, and corrosion on plugs weakens the contact. Voltage spikes when starting or during a jump start additionally load the unit.

How can you tell that the 89170-04290 is defective?

A defect shows as an airbag warning light in the instrument cluster that lights permanently or intermittently, as an error message in the instrument cluster, as a diagnostic tool without connection to the control unit, and as a fault memory that cannot be cleared.

• The airbag warning light lights permanently or flickers intermittently.
• An error message about the airbag system appears in the instrument cluster.
• The diagnostic tool finds no connection to the control unit.
• The fault memory remains, even after a clearing attempt.

With these signs, airbags and seatbelt pretensioners may not be able to trigger in an emergency. Therefore do not wait, but have the system checked.

Which vehicles is the 89170-04290 fitted in?

The control unit 89170-04290 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

Here you can see which vehicles this control unit is listed for:

• Toyota Tacoma N200 (2004-2015)

Comparing the part number on the label of the removed unit with this page lets you confirm that the unit matches the entry. Whether the control unit itself is defective remains open. Therefore have the fault memory read out before removal, because the log shows whether the control unit or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-04420, 89170-04570, 89170-04600, 89170-04650.

How does the repair of the 89170-04290 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only after that remove the control unit. Finally, create a repair order online and pack the unit carefully for dispatch.

At Airbag24 the unit is tested on the test bench, defective components are replaced, stored crash data is deleted and a function test is carried out. Processing usually takes 3–4 working days. 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 89170-04290 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS. You put the printed repair order into the parcel, and the unit is packed shockproof.

Padding in the box prevents impacts during transport, both on dispatch and on collection.