Plug your Lexia 3/XS Evolution interface into your computer via USB (you do not need to connect it to the car for this check).
Identifies the active firmware version and the "appli.com" version.
By integrating this 5-minute test into your workflow, you will never again waste an hour trying to connect DiagBox to a silent ECU. The PSA Interface Checker 4.4.0 is the unsung hero of French automotive diagnostics—master it, and you master the car.
Install the Lexia 3 USB drivers on your Windows PC (32-bit systems offer the best compatibility).
: Queries the hardware to see if it is recognized as Revision B or the more modern Revision C. psa interface checker 4.4.0
Disconnect your laptop from the internet to prevent background software conflicts.
A fully charged laptop running Windows 7, 10, or 11 (32-bit is preferred for older driver stability, though 64-bit works with correct drivers).
The Interface Checker is a lightweight utility used to manage the internal firmware of your VCI. It allows you to:
Version 4.4.0 marked a major shift from the deprecated Pod Security Policies (PSP) to the built-in Kubernetes Pod Security Admission (PSA) controller. The interface checker in this version is designed to audit and enforce the standard PSA levels: Plug your Lexia 3/XS Evolution interface into your
Security software often flags interface checkers as false positives due to their low-level hardware access.
Open Windows Device Manager. Look for "UMDF USB Device" or "ACTIA USB Device". If it has a yellow exclamation mark, reinstall the drivers manually from your Diagbox installation folder. Flash Failed / Update Interrupted
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To help you get your diagnostic setup running perfectly, please let me know: The PSA Interface Checker 4
It directly communicates with the VCI via USB to detect its current state.
Click "Activate" followed by "Reference Serial." The software will display your current firmware version (e.g.,
: You can attempt to download the tool from the following links shared by users. As with any file downloaded from the internet, always ensure you have adequate security measures in place.
If you run Diagbox 9.xx, ensure your interface checker confirms you are on firmware 4.3.x or 4.4.0.