Volkswagen Taigo CS1 airbag control unit repair

What is a Volkswagen Taigo CS1 airbag control unit?

When you switch on the ignition, the airbag control unit first checks itself and the entire restraint system (SRS) in the Volkswagen Taigo CS1. As the central control unit, it evaluates the signals from the crash sensors, decides in an accident whether to deploy airbags and seatbelt pretensioners, and reports faults via the airbag warning light.

In everyday use, this self-test shows itself in only one way: the airbag warning light in the instrument cluster comes on briefly and then goes out again, as soon as the system finds no fault. If it stays on, the control unit has detected a fault. It is fitted in the Volkswagen Taigo CS1 (since 2021), where it works together with sensors, squib circuits and airbag modules.

In an emergency it has only milliseconds: from the sensor signals it determines which airbags and seatbelt pretensioners fire. After the accident it stores crash data and locks itself.

Why is the Volkswagen Taigo CS1 airbag control unit defective?

The most common cause is an accident: the crash data stored at that moment remains in the control unit, even if no airbag was deployed. Ageing components, cold solder joints, corrosion and moisture at the connectors, or voltage spikes are also possible causes.

Crash data cannot be erased with an ordinary diagnostic tool. The control unit stays locked, even when the bodywork has long since been put right. Independently of that, the electronics deteriorate over the years, solder joints become brittle, and if moisture gets into the connectors, corrosion sets in there. A weak battery or a jump-start can produce voltage spikes that damage sensitive components.

How you notice it: the airbag warning light stays on permanently, the fault memory cannot be reset, or the diagnostic tool cannot establish contact with the control unit.

Common error codes for Volkswagen Taigo CS1 airbag control unit repair

The error codes for the Volkswagen Taigo CS1 relate to internal faults of the control unit, stored crash data, the power supply and the squib circuits of the airbags. Which of them is in the fault memory depends on the particular fault.

The following codes are known from the fault memories of this model, among others, and several at once are also possible:

• 65535 → Internal memory fault in the control unit
• B2013 → Fault in the control unit's data area
• 00595 → Crash data stored, impact detected
• 01226 → Crash data stored, driver airbag
• 00532 → Supply voltage outside the permitted range
• 00588 → Driver airbag squib circuit: resistance out of range or short circuit
• 00589 → Passenger airbag squib circuit: resistance too high
• 01217 → Driver-side side airbag squib circuit: circuit fault

The codes are read out with a diagnostic tool. A code alone, however, does not prove that the control unit is defective, because connectors, wiring or an airbag module can also be the trigger. Only the inspection shows what the cause is.

What part numbers are available for the Volkswagen Taigo CS1 airbag control unit repair?

You will find the part number on the label of your control unit; it defines the exact version. Depending on equipment and year of manufacture, there are different numbers within the model series.

The following numbers are known for the Volkswagen Taigo CS1, although the list need not be complete:

• 2Q0 959 655 AS

Compare the number on your unit with this list. This only ensures that it is the right unit; whether it is actually defective is shown only by the fault memory read-out or the inspection.

This is how you get to the repair: have the fault memory read out, disconnect the battery and remove the control unit. Note down the complete part number, create a repair order online and send in the unit. At Airbag24, inspecting, repairing and testing usually take 3–4 working days. 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.