What is a Volkswagen Polo Mk2 airbag control unit?
The Volkswagen Polo Mk2 airbag control unit is your vehicle's central safety unit, precisely activating all occupant restraint systems, such as airbags and seatbelt pretensioners, in the event of an accident. It continuously monitors sensor data, stores important crash information, and ensures the proper functioning of all airbag modules for maximum occupant safety.
This electronic control unit, also known as the ECU, is essential for the vehicle's passive safety. It is responsible for detecting sudden decelerations using acceleration sensors. Within milliseconds, the control unit then sends the trigger signal for the airbags to deploy, protecting the occupants.
Why is the Volkswagen Polo Mk2 airbag control unit defective?
A Volkswagen Polo Mk2 airbag control unit can be defective because internal components fail due to aging or voltage spikes, crash data is stored incorrectly, or communication within the system is disrupted. Defects often manifest themselves as persistent airbag warning lights, making professional diagnosis and repair essential.
Common causes of failure include problems with the internal power supply or overvoltage. An accident, even a minor one, can cause the control unit to store crash data, which then requires replacement or repair, even if the airbags haven't deployed. A lack of communication with the control unit is also an indication that the airbag control unit is defective.
Common error codes for Volkswagen Polo Mk2 airbag control unit repair
During Volkswagen Polo Mk2 airbag control unit repair, specific error codes indicate problems directly affecting the electronic control unit. These codes allow for targeted diagnostics to identify the cause of the failure and restore the safety of the airbag system.
- B1000 : Control unit communication error → Indicates a fault in the signal transmission of the control unit.
- 00588 : Driver side airbag igniter resistance too high/low → Indicates a problem in the driver airbag igniter circuit, often caused by the control unit itself.
- U1111 00 : Function restricted due to missing messages → Means that the control unit's communication via the CAN bus is faulty.
- U1401 00 : Function restricted due to excessive supply voltage → Indicates that the electrical voltage received by the control unit is too high.
- U1011 00 : Supply voltage too low → Signals that the control unit is supplied with insufficient voltage and is therefore reporting a failure.
What part numbers are available for the Volkswagen Polo Mk2 airbag control unit repair?
For the Volkswagen Polo Mk2 airbag control unit repair, the original OEM part numbers 6N0 909 603 and 1J0 909 603 are primarily relevant. These have been verified multiple times by independent sources and guarantee full compatibility with your vehicle model and year of manufacture.
Part number 6N0 909 603 is the most well-known and frequently cited OEM number for the airbag control unit in the Polo 6N. It is confirmed by supplier references such as Bosch 5WK4163 and is a direct part from Volkswagen. Another compatible OEM part number is 1J0 909 603, which has also been verified in conjunction with the Bosch number 5WK4163 for this model.
Control units with different numbers, such as 6Q0 909 605AE or 1C0909605F, are intended for later Polo generations and do not fit the Mk2. Before having your Volkswagen Polo Mk2 airbag control unit repaired at your local workshop, please ensure that the part number matches exactly.