2001 Silverado, 10 minute delay?

From my knowledge, your Silverado's radio is NOT supposed to stay on for 10 mins after you take out your key?! I work at a Chevy dealership, and I can guarantee you that NONE of there cars or trucks' radios stay on for 10 mins after you remove the key. The only way to make the radio stay on is if you had the car running, or left the key in the "ACC" position, and if you remove your key while the doors are closed, then the radio should stay on. Im not sure for how long, but as soon as you open any door (While the key is out after you removed it when the doors are closed) your radio turns off.

Slammed01 I would first check ALL the features of your alarm. If everything was hooked up correctly it shouldn't have interfered with any factory features. If something is not working correctly then that's usually whats causing the problem with the car. If that dosen't get you anywhere check where the door trigger wire is connected. If they used a different wire for each door and didn't diode isolate them this will cuase a problem. If I remember correctly there is a light under the dash that comes on when the doors are open it has a white wire and a orange wire, orange is constant pwr +, white is neg - when doors are open if thats there hook your neg trigger from the alarm to the white wire and you should be ok.

As always check your wire with a meter before you connect them to the alarm.

HTH

Yeh that would be a good indication that something is wrong.

If they used individual door triggers and didn't isolate them it could be feeding back a signal to your BCM or at best confusing it. If thats happening it will cause all sorts of problems. I wouldn't go thru the trouble of isolating the different door triggers there is one wire that does all doors somewhere in the car. Find that and you should be ok.

For door trigger use the purple wire at the light switch.....not affected by the dome delay...NEG(-)

Parking lights...brown at the keyless module under dash in the blue connector

Purple wirem (-) behind headlight switch will control both doors.  No need to diode isolate or anything like that.  Tan wire at the bcm, far right plug.  Hook up to you automatic rearm off your alarm and it will kill the radio, no need to wait for the 10 minute delay.  That wire can also be found in the driver's door at the horseshoe (the thing that latched the door shut.

If installed at a shop, I would take it back with this information.  That truck is one of the easiest on the market.  Almost everything can be found at the BCM and Ign harness.  I you installed it, I would go thru my connections and follow the instructions on all these posts that have responded to you.  Good luck.