Airbag control unit with part number 89170-0C520

What does the airbag control unit 89170-0C520 do?

The 89170-0C520 is the SRS control unit of Toyota. It processes the signals from the crash sensors and, in a crash, fires the right airbags and seatbelt pretensioners within milliseconds. After an accident it stores crash data and locks itself.

The control unit monitors the restraint system continuously and records any faults. If it detects a fault, this is shown via the airbag warning light in the instrument cluster.

In normal operation its work goes unnoticed, although it is active at all times.

Why does the control unit 89170-0C520 fail?

The most common cause is crash data stored after an accident, even when no airbag has deployed, because a normal diagnostic tool cannot erase them. Aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes are also possible.

During repair at Airbag24, stored crash data are erased. The other causes are summarised in the following list:

• Electronic components age.
• Solder joints can be cold.
• Moisture and corrosion at plug connections impair the contact.
• Voltage spikes from the vehicle electrical system, for example with a weak battery or a jump start, damage the electronics.

How can you tell that the 89170-0C520 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool does not find the control unit, and the fault memory cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may not be able to deploy.

The warning light is the most visible sign of a problem in the restraint system. Take it seriously, even if it goes out again after a drive.

A fault may occur only intermittently, but the cause then remains visible in the fault memory. Therefore, have the system checked.

Which vehicles is the 89170-0C520 fitted in?

The 89170-0C520 is fitted in these vehicles: Toyota Tundra K30 (2007-2021). The part number of the unit is decisive.

The following list shows the assigned vehicles:

• Toyota Tundra K30 (2007-2021)

Before you send the unit in, these steps help. Comparing the part number on the label with this page only confirms that you have removed the correct unit. Reading out the fault memory, by contrast, shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-0C440, 89170-0C450, 89170-0C451, 89170-0C452, 89170-0C490, 89170-0C581.

How does the repair of the 89170-0C520 work?

First have the fault memory read out and attach the log. Then disconnect the battery before you remove the control unit. Afterwards create a repair order online and send the unit in, well packed.

The order serves the safety of the airbag system and is therefore binding.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a functional test. Processing at Airbag24 usually takes 3–4 working days. The unit then 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 89170-0C520 get to Airbag24?

You can either send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

The printed repair order goes into the parcel. Pack the unit shock-proof so that it arrives undamaged.