Airbag control unit with part number 89170-35180

What does the airbag control unit 89170-35180 do?

In Toyota the airbag control unit 89170-35180 is the control unit of the restraint system (SRS). It evaluates the crash sensors and, in the event of an accident, decides which airbags and seatbelt pretensioners are triggered.

The control unit monitors the system during operation, stores detected faults and reports them via the airbag warning light.

After an accident the unit records crash data and locks itself. Only a repair can unlock it.

Why does the control unit 89170-35180 fail?

The most common cause is crash data from an earlier accident, even if no airbag was triggered. Added to this are ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes from a weak battery or a jump start.

This data stays in memory and cannot be removed with normal diagnostic tools. Airbag24 erases it during the repair.

Over the years the electronic components age. Cold solder joints in turn lead to intermittent contacts that are difficult to pin down.

Moisture and corrosion at plug connectors impair the contact. Voltage spikes, for example when a jump start is connected or the battery is weak, load the circuit.

How can you tell that the 89170-35180 is defective?

A fault on the 89170-35180 shows mainly through the airbag warning light, which lights up permanently or intermittently. A fault message may also appear in the instrument cluster, the diagnostic tool may be unable to connect, or the fault memory may not be erasable.

• The airbag warning light in the instrument cluster stays on permanently or flickers intermittently.
• A fault message appears in the instrument cluster.
• The diagnostic tool finds no connection to the control unit.
• The fault memory cannot be cleared.

While a fault exists, airbags and seatbelt pretensioners may not deploy in an emergency. A prompt check of the system is therefore advisable.

Which vehicles is the 89170-35180 fitted in?

The control unit 89170-35180 works in these vehicles: Toyota 4Runner N210 (2002-2005) and N210 Facelift (2005-2009).

The assignment is shown in this list:

• Toyota 4Runner N210 (2002-2005)
• Toyota 4Runner N210 Facelift (2005-2009)

Comparing the part number on the label with this page only tells you about the identity of the unit.

Have the fault memory read out before you remove the control unit. Only this result decides whether it is defective or whether a cable or plug is causing the fault.

For the same vehicles, we also repair control units with the part numbers 89170-35210.

How does the repair of the 89170-35180 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Next you create the repair order online and pack the unit well. Only then do you send it in.

At Airbag24 the unit is checked, defective components are replaced, and the crash data is erased. A functional test completes the repair before your own unit is sent back.

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 89170-35180 get to Airbag24?

You can arrange shipping of the parcel yourself, or alternatively book a UPS collection for an extra charge. After the repair the unit comes back to you by UPS.

Put the printed repair order into the packaging and provide shock-proof padding.