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Ok experts, my son needs your help. He just bought his first truck, a 2001 Silverado 5.3 LT 2WD. We are going through it an fixing some small issues. Well there is one small issue that is driving us crazy! The dome light didn't have a bulb. So when we put one in and the dome light will not go out. The two side markers in the door panels were missing bulbs and when we installed those, the same thing happens. We watched some many youtube videos on this and are not sure what to do next. The map lights do not come on when the doors are open but turn on and off with the switches. We read how the dome light sensors are in the door lock mechanism and did some trouble shooting. When we open each door, the security light blinks. When we close the doors, it stops. We tried each door individually to make sure it there wasn't a stuck switch. So it's seeing the doors open and close which should turn on the dome lights. It seems like if a switch was stuck closed and caused the light to stay on, them when we shut the door, the security light would blink as it thinks the door is open, but that's not happening. Any ideas? We are stumped. 8-( Thanks! Give me the old pins style door switch any day.

The first issue is the puddle/domelight's. I first noticed the issue when the puddle lights were flickering when the unlock button was pushed or the door was opened. Also, the interior dome lights would not come on when the door was opened. I've pushed the overhead switch to the on position and sometimes they would flash on quickly and shut off, but most of the time not come on at all. The dome lights come on when the individual buttons are pushed, but not at all with the overhead switch. Anyone know where the fuse is that controls the overhead switch? My second issue is with the left turn signal. On the DIC I got a turn indicator failure for the left rear. The indications are with the blinker activation, the mirror/dash blinker lights will flash normal for about three seconds and then pulse quickly, followed by DIC message. *edit* Brake lights (left) also don't activate. I took the truck in today and got it diagnosed. The diode mod, performed exactly like the steps in this forum, somehow shorted out my BCM. I can't believe that would have done it, considering several other things that BCM controls work without issue. Well, new BCM and programming repair will cost one $675 dollars, all because I forgot to take out the damn diode before going to the dealership. Hard life lessons. sidenote: I also performed the footwell lights modification and I'm certain this somehow factored into the equation. I just removed the bcm and there are no chared areas or visible broken solders. If the bcm shorted out, wouldn't I be able to see something on the circuit board? Can any trained eyes spot any areas of interest where I can snap a closer photo to post. With everyone who has had zero issues with the diode mod, I find it hard to believe this is the case. I think they saw the mod and blamed it all on that right away. Should I even take it as far as to say per the magnuson warranty act, in order for them to decline warranty coverage, they have to prove the diode caused the failures? Financially, what could that lead to in further costs for me, or will they not want to hassle and potentially just fix it? The entire BCM looks unaffected .