Airbag control unit with part number 1C0909605P

What does the airbag control unit 1C0909605P do?

The airbag control unit 1C0909605P is the central control unit for the restraint system (SRS) in Volkswagen. It evaluates the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the condition of the system without interruption. It reports faults via the airbag warning light.

The manufacturer number Continental 5WK43412 is also found on the housing.

After an accident the unit stores crash data and blocks itself.

Why does the control unit 1C0909605P fail?

The most common cause is stored crash data from an accident, even if no airbag has fired. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

An ordinary diagnostic tool cannot remove this crash data. Airbag24 erases it as part of the repair.

The other causes affect the electronics over the service life, when contacts weaken or components age.

How can you tell that the 1C0909605P is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message in the instrument cluster, a diagnostic tool that cannot connect to the control unit, or a fault memory that cannot be cleared confirm the suspicion. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Driving itself does not reveal whether the restraint system is ready. Have the finding checked promptly, even if the car runs normally in everyday use.

Which vehicles is the 1C0909605P fitted in?

The control unit 1C0909605P belongs to Volkswagen and is fitted in these vehicles: Volkswagen Polo 4 (9N3) (2005-2009) and 4 (9N) (2001-2005).

The vehicles assigned to this part number are listed below.

• Volkswagen Polo 4 (9N3) (2005-2009)
• Volkswagen Polo 4 (9N) (2001-2005)

Comparing the part number on the label with this page confirms that you have the right unit. Whether the control unit itself is defective, or whether a plug or cable is causing the fault, is only shown by the fault memory read out. Therefore have it read out beforehand.

For the same vehicles, we also repair control units with the part numbers 1C0 909 605 A, 1C0 909 605 F, 1C0 909 605 K, 6Q0 909 605 T, 6Q0 909 605S.

How does the repair of the 1C0909605P work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Airbag24 usually needs 3–4 working days for checking, repair and function test.

Then create a repair order online and send in the well-packed unit. Airbag24 checks it on the test bench, repairs defective components, erases the crash data and tests the function. Your own 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 1C0909605P get to Airbag24?

You send the unit as a parcel, or have it collected by UPS for an extra charge. Airbag24 sends it back to you by UPS after the repair.

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