Airbag control unit with part number 7700433757

What does the airbag control unit 7700433757 do?

7700433757 is the airbag control unit of Renault, i.e. the central control unit of the restraint system (SRS). It checks the sensors continuously and decides within milliseconds after an impact which airbags and seatbelt pretensioners are triggered.

If the system detects a fault, it shows this via the airbag warning light in the instrument cluster. In a crash the unit also stores crash data and locks itself afterwards.

Without this control unit the airbags would receive no triggering commands, which is why it counts among the central components of the system.

Why does the control unit 7700433757 fail?

With the 7700433757, the most common cause after a crash is stored crash data, even if no airbag has deployed. A standard diagnostic tool cannot erase this data. Other causes are aged components, cold solder joints and moisture.

Aged electronic components can cause faults that only show up during operation. They change their electrical properties gradually.

Cold solder joints and corrosion at plug connectors are typical weak points. Moisture promotes corrosion. Voltage spikes, for example from a weak battery or from jump-starting, can put additional strain on the electronics.

How can you tell that the 7700433757 is defective?

A defect on the 7700433757 is indicated by the airbag warning light: it lights up permanently or intermittently. In addition there is an error message in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

Have the warning checked promptly rather than ignoring it. This applies particularly if the warning light stays on permanently.

The warning light is the most visible form of the notice, supplemented by the messages in the display.

Which vehicles is the 7700433757 fitted in?

The 7700433757 is fitted in these vehicles: Renault Twingo I (1993-2007). Check whether your car is meant using the vehicle papers.

Here is the overview:

• Renault Twingo I (1993-2007)

Compare the part number on the label of the removed unit with this page. This only confirms that the unit matches. Have the fault memory read out before removal; only this log 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 550273300, 7700423313A, 7700839010C, 8200018833, 8200018835A, 8200018835B.

How does the repair of the 7700433757 work?

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery, remove the 7700433757 and create a repair order online. Then send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. The unit is then returned 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 7700433757 get to Airbag24?

You send the control unit 7700433757 as a parcel or arrange a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

The printed repair order goes into the parcel. Pack the unit shock-proof.