Airbag control unit with part number 89170-30170

What does the airbag control unit 89170-30170 do?

The airbag control unit 89170-30170 is the central control unit of the restraint system (SRS) for Lexus. It processes the crash sensor signals, decides in an emergency within milliseconds on the triggering of airbags and seatbelt pretensioners, and checks the system continuously. Detected faults are shown via the airbag warning light.

After an accident the unit stores crash data and locks itself. All components of the restraint system rely on this evaluation, which makes the unit indispensable for safety in the vehicle.

Why does the control unit 89170-30170 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Also to be considered are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Stored crash data stays in the unit until it is erased. An accident without a triggered airbag can also leave it behind.

The other causes are of a general nature. Electronics age, solder joints can go cold, and moisture attacks plug connections. Voltage spikes also put strain on the electronics.

How can you tell that the 89170-30170 is defective?

A defect shows on the airbag warning light in the instrument cluster, which lights up permanently or intermittently, on a fault message in the instrument cluster, on a missing connection to the diagnostic tool, or on a fault memory that cannot be cleared. In that case airbags and seatbelt pretensioners may possibly not trigger in an emergency.

The warning light is the most obvious sign, since the system reports faults through it. Anyone who sees the light on knows that the system has detected a fault and can have the fault memory read out.

A diagnostic tool that makes no contact with the control unit is also a sign that calls for a closer check.

Which vehicles is the 89170-30170 fitted in?

The 89170-30170 is fitted in these vehicles: Lexus GS S160 Facelift (2000-2005) and S160 (1997-2000).

The list shows the vehicles for which this number is recorded with us.

• Lexus GS S160 Facelift (2000-2005)
• Lexus GS S160 (1997-2000)

On the one hand, compare the part number on the label of the removed unit with this page. That only confirms that it is the right unit. On the other hand, have the fault memory read out before removal. Only this log shows whether the control unit itself is defective or a plug or cable is the cause.

How does the repair of the 89170-30170 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Afterwards, create a repair order online and send the well-packed unit in. Airbag24 checks it, repairs defective components, erases the crash data and carries out a function test; processing usually takes 3–4 working days.

The sequence serves safety during removal and is therefore binding. Anyone who keeps to it works on the disconnected system without risk.

After the function test, your own unit 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 89170-30170 get to Airbag24?

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

Put the printed repair order into the parcel and pack the control unit shock-proof.