Airbag control unit with part number 1C0909605M

What does the airbag control unit 1C0909605M do?

The airbag control unit 1C0909605M controls the restraint system (SRS) of Skoda vehicles. It evaluates the signals from the crash sensors and decides within milliseconds in a crash which airbags and seatbelt pretensioners are triggered. It also monitors the entire system continuously and reports faults via the airbag warning light.

In everyday use the unit works unnoticed in the background. In an emergency, however, the evaluation must happen so quickly that no margin remains. The electronics are therefore designed for this single task and are always ready.

After a crash, the control unit stores crash data and locks itself. The manufacturer number Continental 5WK43125 is also printed on the housing.

Why does the control unit 1C0909605M fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or a jump start.

Crash data is also created by an impact that does not trigger an airbag. It remains in the memory until it is removed by a method that goes beyond a normal reading tool. Airbag24 erases it during the repair.

Aged components can cause faults that appear after years in the vehicle. Cold solder joints on the circuit board and moisture at plugs have a similar effect, and corrosion strengthens it.

Voltage spikes in the vehicle electrical system put additional strain on the electronics. A check of the battery and plugs is therefore part of the fault search.

How can you tell that the 1C0909605M is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition there may be a fault message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the most noticeable sign. It shows that the system has detected a fault and remains a warning signal until the cause is clarified.

A message in the instrument cluster also points to the fault. If the diagnostic tool cannot connect to the control unit, that is a further sign. A fault memory that cannot be cleared also belongs here.

Which vehicles is the 1C0909605M fitted in?

The control unit 1C0909605M is fitted in these vehicles: Skoda Superb 1 [3U] Facelift (2006-2008) and 1 [3U] (2001-2006). The list below shows the assignment in detail.

You will find the vehicles in detail here:

• Skoda Superb 1 [3U] Facelift (2006-2008)
• Skoda Superb 1 [3U] (2001-2006)

Compare the part number on the label of the removed unit with this page. This ensures that it is the right unit. Also have the fault memory read out beforehand, because only this log shows whether the control unit itself 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 B, 1C0 909 605 F.

How does the repair of the 1C0909605M work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Create a repair order online and send in the well-packed unit. Airbag24 usually processes it within 3–4 working days.

For safety reasons this sequence is binding. The control unit may only be removed once the fault memory has been secured and the battery has been disconnected.

At Airbag24 the team checks the unit on the test bench and replaces defective components. Stored crash data is erased, followed by a function test. 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 1C0909605M get to Airbag24?

You send the unit in as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order in the parcel and pack the control unit shock-proof.