Having hunted down for this myself, and tbh not having much look on Google, I thought I’d start with a descriptive post. Once the new one arrives next week I’ll add pictures and maybe a video on where it is.
It would seem that a lack of reversing lights is getting to be more common on a Freelander of 199X vintage now they are reaching a certain age.
So where is it, and how to get to it. Well the first job is to check that it is the switch. Down the side of the battery, the airbox is attached with two bolts, take these out with a ratchet spanner or suffer “twisty wristy” pain. Disconnect the lower air intake pipe in front of the battery, that just slides off then move the filter assembleing towards the back of the engine. Now look straight down at the gearbox, from a sheathed set of wires you will see two wires, go down towards the front of the gearbox, they have handy quick connectors on them. Simply unplug them from the switch and into each other to create a permanent circuit. Put the ignition to II and check your reverse lights are on, if they are, you need a new switch.
Now for ease of access, I found it easier to remove the sump guard, four bolts under the bumper, two either side on each bracket and two little 10mm one on the plate. Follow the wires that you have disconnected down to a 19mm plug that is the reverse light switch, remove replace, put everything back and cross fingers.
Part number CDU51L and can be found online for under a tenner.
Once mine turns up, and I’ve traced what’s draining the battery so heavily and quickly - I’ll post some pictures.