Airbag control unit with part number 8201138129

What does the airbag control unit 8201138129 do?

The airbag control unit 8201138129 is the central control unit of the restraint system (SRS) for Renault. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. It monitors the entire system continuously and shows faults via the airbag warning light.

Monitoring covers the sensors, triggering units and the wiring between them. Only a fully functioning system reacts correctly in an emergency.

After an accident, the unit stores crash data and locks itself. This storage is part of how the system works and determines how a later repair proceeds.

Why does the control unit 8201138129 fail?

The most common cause at the 8201138129 is crash data stored after an accident, even if no airbag fired; a normal diagnostic tool cannot erase it. Other causes are also possible: aged components, cold solder joints, corrosion at plug connections and voltage spikes.

Crash data is the most obvious suspicion if the unit becomes conspicuous after an accident. It is not the only explanation.

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 8201138129 is defective?

The airbag warning light in the instrument cluster, which stays on permanently or intermittently, is the clearest sign of a defect in the 8201138129. Further signs are fault messages in the instrument cluster, a diagnostic tool without connection and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

The light is a signal from the control unit itself, not a guess from outside. Which cause lies behind it is clarified only by reading out the fault memory.

Which vehicles is the 8201138129 fitted in?

The assignment on this page is based on our data for Renault. The control unit 8201138129 is fitted in these vehicles: Renault Kangoo II (2008-2021).

You will find the list of vehicles here:

• Renault Kangoo II (2008-2021)

You should compare the part number on the label of the removed unit with this page; only that ensures it is the right unit. Have the fault memory read out beforehand, because only that result 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 2840211503, 8200 656 329, 8200656331, 8201 229 153 A, 8201 475 929, 8201025624.

How does the repair of the 8201138129 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit. Airbag24 tests it, replaces defective components, erases stored crash data, carries out a function test and returns your own unit.

The order protects you: only with the battery disconnected can the control unit be removed.

Processing at Airbag24 usually takes 3–4 working days.

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 8201138129 get to Airbag24?

You send the control unit 8201138129 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

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