Airbag control unit with part number 8200018835

What does the airbag control unit 8200018835 do?

As an SRS control unit, 8200018835 controls the restraint technology of Renault. It detects signals from the crash sensors, decides in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the components continuously. After an accident it stores crash data and locks itself.

The decision to trigger is made in milliseconds, and the unit must be ready for operation at all times for this.

If the unit detects a fault, it creates an entry in the fault memory and shows the fault via the airbag warning light.

Why does the control unit 8200018835 fail?

The most common cause is crash data from an accident that are stored in the unit, even if no airbag was triggered; they cannot be erased with a usual diagnostic tool. In addition there are aged electronics, corrosion at plug connections, cold solder joints and voltage spikes, for example from a weak battery or a jump start.

Crash data remain in the unit after the accident, regardless of whether an airbag was actually triggered. This is the most common reason why a control unit becomes conspicuous after an accident.

The other causes lie in the electronics themselves and in their connections. How strongly they interact in an individual case only becomes apparent on examination, because it cannot be seen from outside.

How can you tell that the 8200018835 is defective?

A defect in the 8200018835 shows itself through an airbag warning light that lights up permanently or intermittently, an error message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared.

While the light is on, airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light is therefore a visible sign from the system that something in the restraint system is not right.

Which vehicles is the 8200018835 fitted in?

The SRS control unit 8200018835 is fitted in these vehicles: Renault Twingo I (1993-2007).

Below are the vehicles that are recorded for this part number in our data.

• Renault Twingo I (1993-2007)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Also have the fault memory read out beforehand, because its log shows whether the control unit or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 550273300, 7700423313A, 7700839010C, 8200018833, 8200018835A, 8200018835B.

How does the repair of the 8200018835 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit 8200018835. Afterwards create a repair order online and send in the unit.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. The unit then goes back to you.

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 8200018835 get to Airbag24?

You send the control unit 8200018835 to Airbag24 as a parcel, or have it collected by UPS for an extra charge. Airbag24 returns the repaired unit to you by UPS.

The printed repair order goes into the parcel; you pack the unit itself shock-proof.