Airbag control unit with part number 1J0 909 608 AN

What does the airbag control unit 1J0 909 608 AN do?

The airbag control unit 1J0 909 608 AN is the central control unit of the restraint system (SRS) of Volkswagen. It evaluates the signals from the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It shows faults via the airbag warning light.

The manufacturer number Continental 5WK4154 is additionally printed on the housing. It helps with comparison, but the number on this page remains decisive.

After an accident, the unit stores crash data and locks itself. The repair is the only point at which this lock is lifted.

Why does the control unit 1J0 909 608 AN fail?

The most common cause for the 1J0 909 608 AN is stored crash data after an accident, even if no airbag was triggered. Further causes are aged electronics, moisture and corrosion at plug connections, cold solder joints and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 removes it during the repair, and you do not have to prepare anything for this. Aged components and contact problems, by contrast, are causes that only become apparent during the test.

Voltage spikes arise, for example, from a weak battery or when a jump-start is connected, and moisture acts through the plug connections. Which of these causes is present is determined by the examination on the test bench.

How can you tell that the 1J0 909 608 AN is defective?

A defect shows itself on the 1J0 909 608 AN through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Additionally, an error message appears, the diagnostic tool cannot establish a connection, and the fault memory cannot be cleared.

If the warning light is lit, airbags and seatbelt pretensioners may fail to trigger in an emergency. Take the indicator seriously and have the fault clarified.

Which vehicles is the 1J0 909 608 AN fitted in?

The 1J0 909 608 AN is fitted in these vehicles: Volkswagen Golf 4 (1J); Volkswagen Golf GTI Mk4; Volkswagen Golf Variant 4 (1J5).

The vehicles in which this control unit was installed are listed in the following list.

• Volkswagen Golf 4 (1J)
• Volkswagen Golf GTI Mk4
• Volkswagen Golf Variant 4 (1J5)

Compare the number on the label of the removed unit with 1J0 909 608 AN on this page. This only ensures that you have the right unit. Also have the fault memory read before removal, because only this result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0261207190, 1C0 909 605 A, 1C0 909 605 F, 1J0 909 603 AN, 1J0 909 605 A, 1J0 909 609.

How does the repair of the 1J0 909 608 AN work?

First you have the fault memory read and enclose the log. Then you disconnect the battery and only then remove the control unit 1J0 909 608 AN. Next, you create a repair order online and send the well-packed unit in. Airbag24 usually processes it in 3–4 working days.

On the test bench, Airbag24 checks the unit, replaces defective components, erases the stored crash data and tests the function. 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 1J0 909 608 AN get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 sends the repaired unit back by UPS.

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