Airbag control unit with part number 156348104

What is the function of Airbag Control Unit 156348104?

The Airbag Control Unit 156348104 is the central control module of the passive safety system (SRS) in vehicles such as the Fiat Tipo and Chrysler Neon. It continuously monitors data from crash sensors to rapidly deploy airbags and seatbelt pretensioners in the event of a collision, while also recording relevant crash data.

As the “brain” of the restraint system, this module processes all pertinent signals from acceleration and pressure sensors within the vehicle. Based on this data, it determines within milliseconds which safety components need to be activated. A malfunction or blockage of the control unit inevitably disables the entire airbag system, indicated by the SRS warning light in the cockpit.

Its primary task is to ensure occupant safety. If this unit fails, its protective function is lost, making immediate diagnosis and repair essential.

What types of failures occur in Control Unit 156348104?

The most common cause of failure for Control Unit 156348104 is the storage of crash data after an accident, which results in intentional immobilization of the device. Other typical issues include internal electronic faults on the circuit board, water damage, or overvoltage, leading to error codes such as B1000 (control unit defective).

Following a collision, the manufacturer locks the control unit for safety reasons, even if it remains physically undamaged. This condition cannot be cleared using standard workshop diagnostic tools. Professional repair is required to remove the lock and restore full functionality.

Internal electronic malfunctions are also widespread. Defective components—such as capacitors, processors, or memory chips (EEPROM)—can disrupt operation. Causes may include aging, vibrations, or external factors like moisture and voltage fluctuations, which can lead to corrosion or short circuits on the circuit board.

This control unit is also compatible with alternative part numbers 52017547 and 208055, where similar fault patterns may occur.

How do you recognize a failure in Control Unit 156348104?

A failure in Airbag Control Unit 156348104 primarily manifests as a permanently illuminated or flashing SRS airbag warning light in the instrument cluster. Often, communication with the diagnostic tool becomes impossible, or error codes such as B1000, 65535, or 93F9 appear that cannot be cleared.

The illuminated warning light is the clearest indication. It alerts the driver that the entire restraint system has been deactivated and that, in the event of a crash, neither airbags nor seatbelt pretensioners would deploy.

Another clear symptom is the inability to communicate. When a workshop attempts to read the fault memory via the OBD interface, they gain no access to the control unit—the module no longer responds to diagnostic requests.

Even when communication is possible, specific error codes point to an internal, irreparable fault. Codes such as B1000 (control unit defective), 65535 (control unit defective), 93F9 (internal error), or general CAN-bus errors are typical and cannot be resolved simply by clearing them.

In which vehicles is Control Unit 156348104 installed?

The Airbag Control Unit with part number 156348104 is primarily found in select models from Fiat and Chrysler. It was specifically developed for the third generation of the Fiat Tipo and for the Chrysler Neon of the 356 series, where it was installed as standard equipment.

At Airbag24, we professionally repair Control Unit 156348104 for the following models:

Fiat Tipo (third generation, model years 2016–2021)

Fiat Tipo (356 facelift, from model year 2020 onward)

Chrysler Neon (356 series, model years 2016–2020)

How is Control Unit 156348104 professionally repaired?

Professional repair at Airbag24 includes diagnosis, elimination of the root cause, and a final functional test. Upon submission, technicians analyze the unit, erase stored crash data, replace faulty electronic components on the circuit board, and reset the device’s software.

As a first step, it is recommended to have a diagnosis performed at a specialized workshop before removal, to rule out wiring or sensor-related issues. A diagnostic report should be included with the shipment.

Once received at Airbag24, experienced mechatronics engineers conduct a systematic analysis. Depending on the nature of the fault, stored crash data is carefully erased, or defective hardware components—such as capacitors, resistors, or memory chips on the circuit board—are replaced.

Following this, a comprehensive functional test is performed to ensure the control unit is operating flawlessly once again. After successful repair, the module is fully operational and can be installed in the vehicle via plug-and-play. We provide 2 years' statutory liability for defects on all repairs.