Airbag control unit with part number 7700423185

What does the airbag control unit 7700423185 do?

The control unit 7700423185 is the airbag control unit for Renault and forms the control centre of the restraint system. It processes the crash sensor signals, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

The unit reports faults via the airbag warning light in the instrument cluster. It also checks the connections to the components.

After an accident, the unit stores crash data and locks itself. The lock ends only with the repair.

Why does the control unit 7700423185 fail?

The most common cause of a fault in the 7700423185 is crash data stored after an accident, even if no airbag has triggered; a normal diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or a jump start are also possible causes.

A non-triggered airbag therefore does not mean that the unit has not stored crash data.

Corrosion at contacts is caused by moisture, solder joints can stay cold, and components age over time. Voltage spikes arise from the circumstances mentioned.

Erasing the crash data is part of the repair at Airbag24.

How can you tell that the 7700423185 is defective?

The airbag warning light in the instrument cluster lights up on the 7700423185 permanently or intermittently, and a fault message appears in the instrument cluster. In addition, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then possibly not trigger in an emergency.

• warning light on permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool without connection to the control unit
• fault memory cannot be cleared

This warning cannot be clarified by waiting. If you have such a finding, arrange an inspection, even if the vehicle still seems ready to drive.

The light alone says nothing about the affected component. Only reading out the fault memory provides that information.

Which vehicles is the 7700423185 fitted in?

The 7700423185 is fitted in these vehicles: Renault Mégane I (1995-2003).

Here you will find the list of vehicles for this part number:

• Renault Mégane I (1995-2003)

Compare the part number on the removed unit with this page, so that you can be sure you have checked the right unit. Before removal, have the fault memory read out: only this result shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 600639500, 7700430059, 7700437477B, 8200117651, 8200117651A, 8200117652.

How does the repair of the 7700423185 work?

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery, and only then remove the control unit 7700423185. Finally, create a repair order online and send the unit in well packed.

On the test bench, Airbag24 examines the unit, repairs defective components, erases the crash data and tests the function. Processing usually takes 3–4 working days, after which your own unit comes 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 7700423185 get to Airbag24?

Your control unit 7700423185 can reach Airbag24 as a parcel; alternatively, you book a UPS collection for an extra charge. The return of the repaired unit is also made by UPS.

Enclose the printed repair order with the parcel and pack the unit shock-proof.