Abarth Punto Evo 199 airbag control unit repair

What is an Abarth Punto Evo 199 airbag control unit?

In the Abarth Punto Evo 199, the airbag control unit is the central control unit of the restraint system (SRS). In an accident it evaluates the signals from the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners deploy. It also monitors the system continuously and stores crash data after an accident, locking itself in the process.

Its most important task comes in an emergency: if the vehicle hits an obstacle, the unit must use the sensor values to detect the strength and direction of the impact and send the firing commands to the right modules. The control unit is fitted in the Abarth Punto Evo 199 (2010 to 2014).

So that this function is available in an emergency, the system checks itself during normal driving. The unit tests sensors, squib circuits and wiring. If it notices anything, it indicates this via the airbag warning light in the instrument cluster. If this light stays on, the restraint system can no longer be relied on to deploy.

Why is the Abarth Punto Evo 199 airbag control unit defective?

Usually the cause is crash data stored during an accident, even if no airbag deployed. Other possible causes are aged components, cold solder joints, moisture and corrosion on connectors, or voltage spikes.

A normal diagnostic tool cannot remove stored crash data. The unit stays locked, and the light in the instrument cluster does not go out, even if nothing is visible on the car from the outside.

There are also gradual causes: over the years components on the circuit board age, and fine cracks in the solder joints lead to intermittent contacts. Moisture and corrosion on the connectors distort signals. A weak battery or a jump-start can produce voltage spikes that put additional strain on the electronics.

A defect is indicated if the airbag warning light stays on permanently, the fault memory cannot be cleared, or the diagnostic tool cannot make contact with the control unit at all.

Common error codes for Abarth Punto Evo 199 airbag control unit repair

The codes in the Abarth Punto Evo 199 point to two kinds of faults: a loss of communication with the control unit and an interrupted squib circuit in the airbag system. The respective code shows which fault is present.

The following codes occur on this vehicle, among others:

• U0151 → Communication with the airbag control unit lost
• B0001 → Driver airbag squib circuit interrupted

Error codes are read out with a diagnostic tool. However, a single code does not prove with certainty that the control unit itself is defective, as connectors, wiring or an airbag module may equally be the cause. Only the inspection brings clarity.

What part numbers are available for the Abarth Punto Evo 199 airbag control unit repair?

On the label of the control unit you will find the part number, which defines the exact version. Depending on equipment and year of manufacture, different numbers are used within a model series.

For the Abarth Punto Evo 199 there is no list available here. Remove the unit, read the number from the label and enter it in the repair order. Using the number, we assign your unit unambiguously. Whether there is a defect, however, is only established by the inspection at our workshop or by reading out the fault memory.

Here is how to proceed: have the fault memory read out, disconnect the battery and remove the control unit. Then create a repair order online and send in the unit. Inspecting, repairing and testing at Airbag24 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.