Airbag control unit with part number T4K11935

What is the function of the T4K11935 airbag control unit?

The T4K11935 airbag control unit is the central control module for the occupant protection system in the Jaguar I-Pace X590 (2018–2024). Its primary task is to process sensor data and precisely trigger the airbags and seatbelt pretensioners. A key function is storing crash data after an accident.

As a core component of passive vehicle safety, this control unit continuously monitors all connected sensors—such as acceleration and pressure sensors—as well as the ignition circuits of pyrotechnic restraint devices. In the event of a collision, it determines within milliseconds which airbags and seatbelt pretensioners need to be activated to provide optimal occupant protection.

After an accident, so‑called crash data are permanently stored in the internal memory of the T4K11935 control unit. This data storage results in permanent immobilization of the device and illumination of the airbag warning light, necessitating repair or replacement.

What defects occur in the T4K11935?

The most common reason for repairing the T4K11935 is the storage of crash data following an accident. In addition, internal electronic faults may arise, requiring servicing. These often manifest as specific error messages in the vehicle’s diagnostic system.

The primary cause of failure is the manufacturer‑specified lockout of the control unit after an airbag deployment. The crash data stored in its memory prevent further use and ensure that the safety system remains disabled until the unit is professionally reset.

Another typical defect is a reported “internal error.” This indicates a hardware fault on the circuit board. Possible causes include defective components such as processors, memory chips, or issues with the circuit traces, which can result from aging or environmental influences.

How do you recognize a defect in the T4K11935 control unit?

A defective T4K11935 control unit is primarily indicated by a constantly illuminated airbag warning light in the instrument cluster. Additionally, diagnostic tools may lose communication with the control unit or display specific error codes like “Internal Error,” signaling a malfunction.

The most obvious symptom is a lit or flashing airbag indicator light. It does not extinguish after starting the vehicle, indicating a fault in the safety system that should be inspected immediately.

Often, the vehicle’s fault memory stores a code for an “internal error.” This directly suggests that the control unit itself has detected a hardware or software issue.

Another clear sign is when the control unit becomes unreachable via the OBD interface. In such cases, the workshop cannot perform diagnostics because no communication can be established between the diagnostic tool and the airbag control unit.

In some instances, the airbag warning light cannot be cleared even without any recorded accidents. This also points to an internal defect requiring repair. Problems with triggering individual components—such as driver, passenger, or side airbags—may likewise stem from a fault in the control unit.

In which vehicles is the T4K11935 installed?

The airbag control unit with part number T4K11935 was specifically developed for the Jaguar I‑Pace of the X590 series. It is used in models of this all‑electric vehicle produced between 2018 and 2024.

At Airbag24, we repair the T4K11935 control unit for the following specific vehicle model:

Jaguar I‑Pace (X590 series), model years 2018–2024

How is the T4K11935 control unit professionally repaired?

Professional repair of the T4K11935 at Airbag24 begins with a detailed fault analysis on specialized test benches. Subsequently, crash data are erased, defective components replaced, and damaged circuit traces restored. Following successful functional testing, the unit is returned to the customer.

After submitting the removed control unit, restoration follows a proven procedure. Before repair, it is crucial to confirm through a qualified workshop that the fault truly lies within the control unit. Readout logs and a detailed fault description aid in precise and rapid diagnosis.

Technicians conduct a comprehensive incoming inspection using advanced diagnostic systems specially designed for the complex electronics of Jaguar vehicles, enabling reliable identification of even hard-to‑locate faults.

The actual repair involves erasing stored crash data, replacing faulty electronic components, and carefully repairing damaged circuit traces on the circuit board. If necessary, software updates are also performed, using only high‑quality replacement parts that meet the manufacturer’s quality standards.

After repair, the control unit undergoes a final functional test to ensure all systems are operating correctly. We provide 2 years' statutory liability for defects on all repairs.