Airbag control unit with part number 8201129030

What does the airbag control unit 8201129030 do?

The airbag control unit 8201129030 coordinates the restraint system (SRS) for Renault. In an impact it evaluates the crash sensors and determines within fractions of a second which restraint devices are triggered. At the same time it monitors the system and indicates faults via the airbag warning light.

The control unit responds to signals without you noticing anything, and continuously checks sensors and connections in the process.

After a crash, it stores crash data and locks itself.

Why does the control unit 8201129030 fail?

The most common cause is crash data stored after an accident, even without triggered airbags; a normal diagnostic tool does not erase it. Other causes that may apply are aged components, cold solder joints, moisture at plug connections and voltage spikes.

These causes in detail:

• Ageing of the electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a jump start

Which of these applies only becomes clear when the unit is examined.

How can you tell that the 8201129030 is defective?

A defect in the control unit 8201129030 can be recognised by the airbag warning light, which lights up permanently or only intermittently. Fault messages in the instrument cluster and a diagnostic tool that fails to connect to the control unit are also signs.

These signs occur:

• Permanent or intermittent lighting of the warning light
• Fault message in the instrument cluster
• Diagnostic tool fails to establish a connection to the control unit
• Fault memory cannot be cleared

With such a finding, airbags and seatbelt pretensioners may not trigger in an emergency. A prompt check is therefore sensible.

Which vehicles is the 8201129030 fitted in?

The control unit 8201129030 is fitted in these vehicles: Renault Twingo II (2007-2014). The part number on the unit remains decisive.

The overview of vehicles follows here:

• Renault Twingo II (2007-2014)

A comparison of the part number on the label of the removed unit with this page confirms that it is the correct unit. Also have the fault memory read out before removal, because only then is it clear whether the control unit itself or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 402787B3, 8200 491 652, 8200054938, 8200111668, 8200491655, 8200896811.

How does the repair of the 8201129030 work?

The fault memory is read out first, and the log is enclosed. Then disconnect the battery and only then remove the control unit 8201129030; afterwards create a repair order online and send the unit off well packed. Processing at Airbag24 normally takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components and carries out a function test. Airbag24 also erases the crash data. You receive your own unit back afterwards.

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 8201129030 get to Airbag24?

Either you send the unit 8201129030 yourself as a parcel, or you arrange a UPS collection for an extra charge. Airbag24 handles the return after the repair by UPS.

A shock-proof packed unit with the printed repair order in the parcel is the final step before shipping.