Airbag control unit with part number LX73-14D374-AC

What is the function of the airbag control unit LX73-14D374-AC?

The airbag control unit with part number LX73-14D374-AC is the central control module for the occupant restraint system (SRS) in vehicles such as the Jaguar XE X760. It continuously monitors signals from crash sensors and, in the event of a collision, triggers the deployment of airbags and seatbelt pretensioners within milliseconds.

This component evaluates data from acceleration sensors and reliably detects a crash situation. After activation, the unit permanently stores relevant crash data in its internal memory (EEPROM/Flash), which locks out further functionality until professional repair is performed.

Why does the LX73-14D374-AC control unit fail?

The most common cause of failure for the LX73-14D374-AC control unit is the retention of crash data following an accident. In addition, internal electronic faults may occur, such as issues with power supply, defective semiconductor components, or corrupted data stored in the internal memory.

After a crash, the control unit becomes electronically locked. This safety feature prevents the system from operating uncontrollably after damage. The fault memory then displays entries like “Crash data stored” or indications of activated ignition circuits.

Even without an accident, purely electronic defects can arise. These include cold solder joints caused by thermal stress, faulty voltage regulators on the circuit board, or defective memory chips that lead to internal control unit malfunctions. Such defects often prevent any communication with the device.

How do you recognize a fault in the LX73-14D374-AC control unit?

A defect in the LX73-14D374-AC airbag control unit primarily manifests as a constantly illuminated airbag warning light (SRS indicator) in the instrument cluster. Additionally, error messages may appear on the display indicating a problem with the restraint system.

During diagnostics at a workshop, specific fault codes can be read. Typical entries include “Internal airbag control unit error” or errors pointing to stored crash data after an accident.

In more severe cases, the control unit becomes unreachable via diagnostic tools. Such a loss of communication suggests a more serious internal electronic fault, where the unit no longer responds to requests.

In which vehicles is the LX73-14D374-AC control unit installed?

The LX73-14D374-AC airbag control unit is designed for various Jaguar models. At Airbag24, this part number is professionally repaired for the Jaguar XE of the X760 series, including facelifted versions and sporty variants such as the XE S.

Repair services for this part number are offered at Airbag24 for the following models:

Jaguar XE X760 (circa 2015–2019)

Jaguar XE X760 Facelift (circa 2019–2024)

Jaguar XE S X760

How does repair work at Airbag24?

The repair process at Airbag24 is designed to restore the LX73-14D374-AC control unit to its original factory‑grade functionality. After removal and shipping, the unit undergoes a thorough initial electronic inspection to pinpoint the exact fault.

First, the vehicle is diagnosed at a specialized workshop to confirm that the issue lies within the control unit. Following disassembly according to manufacturer specifications, the unit is carefully packaged—ideally along with a diagnostic report—and sent to Airbag24.

Technicians perform a professional repair, which includes selectively erasing crash data from memory and addressing any underlying electronic faults, such as replacing defective components or reworking solder joints.

Subsequently, a comprehensive functional test is conducted on a dedicated test bench that simulates communication and proper operation of all ignition circuits. Upon successful testing, the repaired control unit is returned and ready for reinstallation in the vehicle. Two years' statutory liability for defects is provided on the repair.