Airbag control unit with part number 6N0909603H

What does the airbag control unit 6N0909603H do?

The airbag control unit 6N0909603H coordinates the restraint system (SRS) of Volkswagen. It receives the signals from the crash sensors, determines within milliseconds which airbags and seatbelt pretensioners to trigger, and monitors the system at all times. If it detects a fault, it shows it via the airbag warning light.

During operation, the unit checks its connections and firing circuits whenever the ignition is switched on. This check runs unnoticed in the background.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 6N0909603H fail?

The most common cause is stored crash data after an accident, even if no airbag was deployed. This data cannot be erased with a normal diagnostic tool. Other causes include aged components, cold solder joints, moisture at plug connections and voltage spikes.

Stored crash data remains in the control unit until Airbag24 deletes it during the repair. The other causes cannot be reliably identified from the outside; only the inspection shows which of them is present in the specific unit.

Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

How can you tell that the 6N0909603H is defective?

A defect shows when the airbag warning light in the instrument cluster stays on permanently or lights up from time to time. A fault message in the instrument cluster, a diagnostic tool with no connection, or a fault memory that cannot be cleared are further signs. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The airbag warning light is the clearest signal the system gives you. This includes:

• a warning light that stays on permanently,
• a fault message in the instrument cluster,
• a diagnostic tool with no connection to the control unit,
• a fault memory that cannot be cleared.

Have the cause checked promptly, because a missing connection can also be due to wiring or plugs rather than the unit itself.

Which vehicles is the 6N0909603H fitted in?

The airbag control unit 6N0909603H is fitted in these vehicles: Volkswagen Polo 3 (6N) (1994-1999) and III 6N2 (1999-2001).

You can see the vehicle assignment in the list below.

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

First, compare the part number on the label with this page. This only confirms that you have the correct unit in front of you. Then have the fault memory read out, because only the 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 1C0 909 605 A, 1J0 909 603, 6N0 909 601, 6N0 909 603, 6N0909603E, 6Q0 909 601.

How does the repair of the 6N0909603H work?

Before removal, have the fault memory read out, enclose the log and disconnect the battery. Then remove the control unit and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Send the unit in well packed. At Airbag24 it goes onto the test bench, defective components are repaired, the crash data is erased and a function test is carried out. Afterwards your own unit is 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 6N0909603H get to Airbag24?

You can get the unit to Airbag24 either as a parcel that you send yourself, or with a UPS collection, which is booked for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant.