Airbag control unit with part number 89170-0C040

What does the airbag control unit 89170-0C040 do?

The airbag control unit 89170-0C040 is the central SRS control unit for Toyota. It evaluates the crash sensors, determines within milliseconds in a collision which airbags and seatbelt pretensioners fire, and monitors the system continuously.

The unit shows detected faults via the airbag warning light in the instrument cluster. The fault information is stored in the memory.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 89170-0C040 fail?

The most common cause in the 89170-0C040 is crash data from an accident, even if no airbag has deployed. Ageing electronics, cold solder joints, moisture and corrosion on plugs, and voltage spikes are also possible.

The crash data remains in the control unit, because a normal diagnostic tool cannot delete it. Airbag24 erases it as part of the repair.

The other causes lie in the electrics. Ageing components, cold solder joints and dampness at the plug connections belong to this group. A weak battery or a jump start can produce additional voltage spikes.

How can you tell that the 89170-0C040 is defective?

A defect in the 89170-0C040 becomes apparent through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Fault messages also appear, the diagnostic tool cannot reach the control unit, and the fault memory remains.

The warning light is the clearest indication. Airbags and seatbelt pretensioners may fail to trigger in an emergency, which is why you should not ignore this display.

The light therefore indicates the fault, so that it does not stay hidden.

Which vehicles is the 89170-0C040 fitted in?

The control unit 89170-0C040 is fitted in these vehicles: Toyota Sequoia K10 (2000-2004). The most reliable way to check the match is by the part number on the removed unit.

These vehicles are assigned to the part number:

• Toyota Sequoia K10 (2000-2004)

Comparing the part number on the label with this page confirms that you own the correct unit. The cause of the fault is shown only by reading out the fault memory, so have this done beforehand.

For the same vehicles, we also repair control units with the part numbers 89170-0C030, 89170-0C410, 891700C140.

How does the repair of the 89170-0C040 work?

Have the fault memory read out and enclose the log before the battery is disconnected and the control unit is removed. Then create a repair order online and send in the unit. Airbag24 generally needs 3–4 working days for testing, repairing and checking.

Airbag24 examines the unit on the test bench, repairs the defective components, erases stored crash data and carries out a function test. Afterwards the unit 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 89170-0C040 get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shockproof.