Interior lights will not turn off even after 1 hr. You can turn them off manually. Where is the timer thing that needs to be replaced?

Did they not teach punctuation where you went to school? It's hard to understand all the situations you are trying to describe, since all the symptoms are run together. But I think you need to replace the BCM. Better yet, take it to a professional shop and they can confirm whether the BCM needs to be replaced.

Check switch , possible in 'on' position, BCM doing a forced power down after detecting lights left on.

There are a couple of things to check. First, check the dimmer control for the dash lights. This actually has two reasons for being there. The first controls the dim and brightness of the dash lights themselves. The second and less known is to activate the interior lights manually. Locate the the dimmer function and turn it all the way one direction then halfway back, this should ensure it is not bypassing the timer and door activations. Next, go through and check all of the door activation switches. These are easy to find in the door jams and simple to deactivate and test. You can remove them with a small open cresent wrench in most cases and there is typically 1 wire attached to them. You'll need some string and electrical tape. Disconnect the wire from the activator, attach a piece of string to it and cover the exposed end up by wrapping in in electrical tape to prevent it from grounding. Stick the wire back through the whole the activator was screwed into. You'll want to disconnect the battery before you start doing this test to avoid shocking yourself or grounding the wire inadvertently. Reconnect the battery, all interior lights should be off at this time. Close the doors then reconnect the battery. Make sure you have disabled any alarms you have installed. The interior lights should be off, if they are not there is a short in your electrical system or light control switch assuming there are no switches, like map light switches, in the on position.

There is a contact switch inside the steering coluum that opens the circuit when the ignition key is removed. The switch in other words is faulty in your car and needs to be replaced. It is quite a job to do for you need to remover the air bag, steering wheel & more to gain access to it

there is a timer on the interior lights to turn off after 20 minutes.
one of your door switches are bad,and it tells the computer that a door is open and the lights are turned off,that makes sense.
a way to test this is to undo the battery for a minute. then see if the interior lights come on. one of the door switches is bad

I am not sure about the 1992 since they have newer dashboard than my 86.

Anyway, I got that same intermittent issue on mine, sometime the battery was drawn in the morning sometime not, very frustrating, until i noticed that the interior light sometime was not going out as it should after 30 seconds when leaving the car in the evening.

I eventually found the timer module after removing the upper dash pad, on the passenger side. The module was just partially unplugged. Put it back in and never got problem anymore (was 6 years ago).

Next to the headlight switch is a dimmer dial for the interior dash lights... if you turn it all the way up, the interior lights remain on... there is a "detent" on the dimmer. turn the interior dash lights all the way full on ...you'll feel the detent, then turn it down back past the detent a little bit...that should cancel the interior courtesy lights... wait a bit because the interior lights are sometimes on delay timers....
good luck let me know what happens.

Double check your dashboard "dimmer" switch, most vehicles allow for adjustment of dash light. Once the max intensity is reached there should be an additional "click" which will cause the interior lights to come on and stay on. This is the first thing to check. Many newer vehicles also have a timer switch you should check which turns off the lights a minute or two after shutting the doors. It this is set to the max position it over rides the shut off.

If this is not the cause, you either have an additional fuse for the reading lights (most likely labeled something like "courtesy"). If you did pull the correct fuse and still have power to the lamps you may have a short in the wiring or faulty light switch, dimmer switch or one or more of the door switches which control the lighting. As you can see, it is a more complex system than most people assume. Please take the issue seriously (it is more than an annoyance) as it can melt your lighting fixtures, cause additional electrical system damage or even potentially cause a fire.

One other thing you may wish to check for is an additional switch on the rear hatch. My Kia Sedona has one I accidentally knocked into the on position which caused similar symptoms. The Sedona also had issues which a "Master Switch" located under the dash which controlled the lighting and it's timer which turns off the lights after a short interval.

Sounds like the timing unit which automatically turns off your dome lights after a few minutes is working backwards. Probably need a new unit.