Airbag control unit with part number 6N0909603P

What does the airbag control unit 6N0909603P do?

The airbag control unit 6N0909603P is the restraint system control unit for Volkswagen. It reads the crash sensors, determines in an accident which airbags and seatbelt pretensioners to trigger, and monitors the system without a break.

Detected faults are shown via the airbag warning light. After an accident it stores crash data and locks itself.

In everyday use you notice nothing, because the monitoring runs quietly in the background.

Why does the control unit 6N0909603P fail?

On the 6N0909603P, the most common cause is storage of crash data from an accident, even without an airbag deployment; an ordinary diagnostic tool cannot remove it. Further causes include aged components, cold solder joints, moisture and corrosion, and voltage spikes.

The individual causes:

• Aging of the electronics
• Cold solder joints
• Moisture on plug connections
• Voltage spikes, for example when starting the engine

How can you tell that the 6N0909603P is defective?

The airbag warning light stays on permanently or intermittently, and an error message appears in the instrument cluster. If the diagnostic tool cannot connect to control unit 6N0909603P, or the fault memory cannot be cleared, that points to a problem. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light reports the fault itself, and that is exactly what it is designed to do.

If the light stays on permanently, have the system checked promptly.

Which vehicles is the 6N0909603P fitted in?

This assignment concerns the control unit with part number 6N0909603P. Related to it, the unit is fitted in these vehicles: Volkswagen Polo 3 (6N) (1994-1999) and III 6N2 (1999-2001).

The list in detail:

• Volkswagen Polo 3 (6N) (1994-1999)
• Volkswagen Polo III 6N2 (1999-2001)

Comparing the number on the label with this page comes first. It only confirms that you have the right unit. Also have the fault memory read out, because only that shows whether the control unit is defective or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 1C0 909 605 A, 1J0 909 603, 6N0 909 601, 6N0 909 603, 6N0909603E, 6Q0 909 601.

How does the repair of the 6N0909603P work?

For the 6N0909603P, have the fault memory read out and attach the log; then disconnect the battery and only then remove the control unit. Send the unit in well packed together with the repair order created online. At Airbag24, checking, repairing and testing usually take 3–4 working days.

Airbag24 checks the unit, replaces defective components, erases the stored crash data and performs a function test at the end.

Afterwards your unit goes back 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 6N0909603P get to Airbag24?

A parcel with control unit 6N0909603P goes to us, or you have it collected by UPS for an extra charge. Airbag24 sends the unit back by UPS after the repair.

A printed repair order belongs in the shock-proof packed parcel.