Airbag control unit with part number LR139699

What is the function of the airbag control unit LR139699?

The control unit LR139699 is the dedicated passenger-side airbag control module for the Land Rover Range Rover Evoque of the L538 series. As a critical safety component, it is responsible for correctly activating and deploying the passenger-side airbag in the event of a collision and is typically located in the footwell on the passenger side.

The primary task of this module is to process signals from the relevant crash sensors and, in an emergency, release the ignition pulse for the passenger-side airbag. It is an integral part of the vehicle’s passive safety system and ensures the protection of the front-seat passenger.

The airbag system is modularly designed. For example, as a complementary component, there exists the driver-side airbag gas generator module with part number LR139698, which was developed for newer Range Rover Evoque models. This underscores the specific function and assignment of each module within the overall system.

Why does the control unit LR139699 fail?

A failure of the control unit LR139699 is usually due to internal electronic defects. As a complex module equipped with specialized sensors and triggering mechanisms, aging components or board-level faults can impair its functionality. Consequently, repairs require in-depth technical expertise.

The most common cause of malfunction is an internal hardware defect. This may involve solder joints, processors, or other critical electronic components responsible for signal processing and the activation logic.

Since the control unit is a safety-critical component, any detected internal fault results in immediate deactivation and the display of a warning message to ensure vehicle safety.

How do you recognize a defect in the LR139699?

The primary indication of a defect in the control unit LR139699 is the permanently illuminated airbag warning light on the instrument cluster. Additionally, specific error codes may be stored in the vehicle’s diagnostic memory, pointing to a fault in the passenger restraint system or a lack of communication with the module.

A typical symptom is the continuously lit airbag warning light. This light does not extinguish after starting the vehicle, indicating a system-relevant fault recorded in the diagnostic memory.

During diagnostics using a workshop scanner, it may happen that the control unit becomes unresponsive. In such cases, no communication can be established between the diagnostic tool and the LR139699 module, suggesting a severe internal defect.

In which models is the LR139699 installed?

The airbag control unit with part number LR139699 is specifically designed for the Land Rover Range Rover Evoque. At Airbag24, we repair this module for the first-generation Evoque, which is divided into the base model and the later facelift version.

Specifically, this component can be found in the following vehicle series:

Land Rover Range Rover Evoque L538 (base model, 2011–2015)

Land Rover Range Rover Evoque L538 (facelift, 2015–2018)

How is the LR139699 professionally repaired?

Professional repair of the LR139699 control unit at Airbag24 includes a detailed electronics analysis, replacement of defective components, and a final functional test. This process restores full operability to the safety-critical component and provides a reliable, cost-effective alternative to a new part.

After removal from the vehicle, the control unit is sent to Airbag24. Here, specialized technicians perform an initial inspection to pinpoint the exact cause of the fault at the component level.

This is followed by expert refurbishment: defective electronic parts are replaced with high-quality replacements, and the circuit board undergoes thorough testing. Upon successful repair, the module undergoes comprehensive functional testing to verify proper operation.

We offer 2 years' statutory liability for defects on every repair performed.