Land Rover B1d9f-11 |link| -

A technician should use a wiring diagram to trace the "crank signal" or engine speed input wire. They will check for continuity to ground while the module is unplugged to confirm if the short is in the vehicle's wiring or the module itself.

Land Rovers are known for complex door electronics. The wiring harness that passes from the A-pillar into the front doors (through a rubber boot) flexes every time you open and close the door. Over time, the insulation can wear away, causing the ambient light positive wire to short against the metal door frame. land rover b1d9f-11