DTC B1252-93: USB Port - No operation: Action

WARNING: This page is about a different car, the 2016 Land Rover LR4, 2015 Land Rover LR4, and 2014 Land Rover LR4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This DTC can only set when routine - USB Interface Self Test (0x602E) - is run and fails

Refer to the appropriate system wiring diagrams and check the USB circuit for short circuit to ground, short circuit to power, open circuit, high resistance
Connect a known functional USB device to the audio video input/output panel and select this source using the rear seat entertainment remote control. Check the left/right rear seat entertainment screen for a valid signal
Using the manufacturer approved diagnostic system, clear the DTCs and retest. If the fault persists, install a new rear seat entertainment control module