Was just thinking, cud my interior light problem be caused by missing door switch on passenger door?
It might, if the wires reached the bodywork .
Rave for a Disco says
Interior courtesy lamps
To determine when to provide an interior courtesy lamps enable output, the BCU checks the following input
conditions:
l Ignition state.
l Transit mode.
l Drivers door open.
l Passenger or rear door open.
The courtesy lamps operate at full brightness when they are first switched on. The BCU then gradually dims the lamps
(fade-out) before completely switching them off. Fade-out occurs over a period of two seconds following the logical
control signal to turn off the lights. When a door is opened, the BCU provides earth paths from the interior lamps, the
load space lamp and the ignition switch illumination. The following table lists the courtesy lamps operation and
duration for holding the lamps on that occurs after the BCU has detected a condition that signals the courtesy lamps
should be switched on:
Control signal Additional conditions Duration
Door open - 10 minutes
Unlock signal from remote transmitter All doors closed and ignition switch not in position III - 1 minute
Unlock signal from the drivers door lock All doors closed and ignition switch not in position III - 1 minute
Ignition switch turned from position II or III to
position 0 - All doors closed - 1 minute
Door changed from open to closed All other doors closed and ignition switch not in position III - 15 seconds
Ignition switch in position III - Timer cancelled
BCU receives a lock command - Timer cancelled
Vehicle has transit mode enabled - 15 seconds on all occasions
It seems to me that you should either replace the missing door switch or carefully insulate the wires so they cannot reach metalwork. This should make the BCU think the door is shut and restore timings to LR's "normal" ones.
