Airbag control unit with part number YS5T-14B056-DA

What is the function of the airbag control unit YS5T-14B056-DA?

The airbag control unit YS5T-14B056-DA is a Bosch OEM component that serves as the central control unit for the occupant safety system (SRS) in certain Ford models. It processes data from acceleration and crash sensors and determines whether and when airbags and seatbelt pretensioners should be deployed.

In the event of a collision, the electronics analyze incoming sensor signals within milliseconds. When predefined threshold values are exceeded, the control unit sends ignition pulses to the relevant pyrotechnic components—such as front, side, or curtain airbags—as well as to the seatbelt pretensioners, ensuring optimal protection for occupants.

As an integral part of the passive safety system, the module continuously monitors all connected components for proper functionality. Any fault—whether in the sensors, ignition circuits, or the control unit itself—is logged and signaled to the driver via the airbag warning light.

What types of defects occur in the YS5T-14B056-DA?

Typical defects of the YS5T-14B056-DA control unit fall into two main categories: logical or software-related issues, such as stored crash data after deployment, and electronic hardware faults affecting components like capacitors, voltage regulators, or solder joints.

A very common cause of failure is stored crash data. After an airbag deployment, the control unit locks internally and permanently stores this information. This condition cannot be cleared using conventional diagnostic tools and results in a persistently illuminated warning light. Communication errors on the CAN or K‑Bus, as well as incorrect coding data, can also trigger malfunctions.

On the hardware level, aging or defective electronic components lead to failures. These include damaged capacitors, faulty voltage regulators, cold solder joints on SMD components, or damaged traces on the circuit board. Such defects require precise diagnosis and replacement of affected components at the chip level.

How do you recognize a defect in the YS5T-14B056-DA control unit?

A defect in the YS5T-14B056-DA control unit primarily manifests as a permanently illuminated airbag warning light on the instrument cluster. Often, communication via the OBD interface is also lost, and the fault memory displays internal control unit errors or stored crash data.

The most obvious symptom is the persistently lit airbag indicator light. It does not extinguish after starting the vehicle, indicating a serious, permanent fault in the safety system that requires immediate inspection.

Another clear sign is the loss of diagnostic capability. If a workshop attempts to read the airbag system’s fault memory, the connection fails. The control unit becomes inaccessible to diagnostic equipment, often pointing to an internal electronic malfunction.

When communication remains possible, specific error codes are frequently recorded in the SRS fault memory. Messages indicating an “internal control unit error” or “crash data stored” directly confirm a defect within the module itself.

In which vehicles is the YS5T-14B056-DA control unit installed?

This Bosch control unit is specifically designed for certain Ford models. According to our records, it is mainly used in the first-generation Ford Ka, as well as in the newer Ford Ka+ and its facelifted variant.

At Airbag24, we repair the YS5T-14B056-DA airbag control unit for the following models currently supported by our service:

Ford: Ka (1st generation, model KA1 RBT, years 1996–2008), Ka+ (3rd generation, years 2016–2018), and the Ka+ facelift (years 2018–2021).

How does the repair process work at Airbag24?

The repair process at Airbag24 follows a standardized, transparent procedure. After submitting your removed control unit, our technicians perform a detailed analysis, fix the issue at the component level or reset the software, thoroughly test functionality, and return the device to you with a 12-month warranty.

Before removing the control unit, it is advisable to read out the fault memory and attach the transmission log. The removed module should be securely packaged and sent to us to prevent transport damage.

Upon receipt at Airbag24, a visual inspection and instrumental analysis are conducted. Using specialized testing and soldering techniques, our technicians identify faulty components such as capacitors, voltage regulators, or memory chips on the circuit board.

The actual repair involves replacing defective components or resolving software issues. Stored crash data is erased using dedicated programming tools, restoring the control unit to its factory settings.

Finally, each repaired control unit undergoes a final test on a simulation test bench. Here, the correct communication and the functionality of all sensor and ignition circuits are verified. Only after passing this test is the device approved for return shipment. We provide a 12-month warranty on every repair performed.

What shipping options does Airbag24 offer?

To ensure a convenient process, Airbag24 offers flexible shipping options. You can either send your defective control unit yourself or arrange a convenient UPS pickup. For return shipments, standard UPS shipping is free, with express and cash-on-delivery options also available.

For outbound shipments, you have two simple choices. You can securely package the control unit and send it to us at your own expense, or alternatively, schedule a UPS pickup at a location and date of your choosing.

Following successful repair, the returned unit will be shipped back to you. Standard UPS shipping is free of charge. If you require faster delivery, you can opt for UPS Express shipping for an additional fee. Both shipping methods are also available with cash-on-delivery. Of course, in-person pickup at our workshop is also possible.