2002 XJR - Don't use it often so it sits for long spells. Hooked the battery - removed the fuel pump relay, spun it then replaced the relay and started it up.
Problem 1 - mirrors are offline.
Problem 2 - interlock solenoid does not respond to brake pedal so I've to manually unlock the gear shifter. Once in gear I noticed it took a lot longer for the global locking to lock the doors.
Problem 3 - steering column does not respond to the position switch, but will move to memory positions via drivers door switchpack.

Thought I'd post this as someone may have a quick fix, it's gone dark here and I'm through for the day, but planned on chasing earths when I can get a look at the wiring diagrams, but from memory all 3 are controlled via the body control module, if so I've never replaced one - do they fail?
Cheers for any insights Guys.

 

A long shot, but try a hard reset, then turn the ignition on for 30 sec. then off again before doing anything else. Supposedly to allow ECU to complete communication with other modules.

 

So this morning I went through all fuse boxes (apart from the ECU) and found 1 15A blown on one of the heal board boxes. Tried the offline stuff - the column responded a little, but no mirrors or interlock...

Then tried a hard reset - systems seemed to be confused with fragmented memory settings? Then one by one things came back on line - gotta thank RJ237 for the suggestion.

Items affected by fuse and memory settings
Powerfold mirrors
Power column
Shifter Interlock
Trunk lid lights
Interior C pillar lights
CD player

I will update with which fuse effects these parts - also the reset was pos+ cable to neg- for 30 seconds, then ignition on for 1 minute. Cycled the steering column, mirrors and shifter and everything is now working beautifully - it's sharp responses, not sluggish as it seemed to be prior to the reset.

Can a mod amend the title of the thread to fixed please?