How do I reset my 2000 Chevy S10 radio control so the radio will turn off when I turn the key off? Currently it stays on, regardless of the key position, until I actually open the truck door. Not a big thing, but kind of annoying. Thx much.

Could be relay contact's stuck closed allowing power to stay on . Or it could be a BCM - body control module problem .

Retained Accessory Power (RAP)
The retained accessory power (RAP) system allows certain vehicle functions to operate for a specific amount of time after the ignition switch is turned OFF. The body control module (BCM) monitors the ignition switch position, battery condition, and each door ajar switch status to determine whether RAP should be initiated or terminated. RAP is controlled with two different methods; serial data and relay control. Some modules receive a RAP message from the BCM over the serial data circuits. Serial data controlled RAP is deactivated as required by their modules RAP power mode operation. Other subsystems are activated directly by the BCM through a RAP relay. Components and systems that are active in RAP are also activated anytime the ignition is any position other than OFF regardless of the door switch signals.

Relay Controlled RAP
The BCM keeps the RAP relay energized during all power modes, except Off-Awake and Crank. The relay is also energized for approximately 10 minutes after shutting the ignition OFF and removing the key, providing no door is opened.
Relay controlled RAP will end when one of the following conditions is met:
• The BCM receives an input from any door ajar or open switch indicating the opening of any door after the ignition key is out of the ignition.
Important: If the BCM is receiving any door ajar or open signal from those switches when the ignition key is turned OFF, RAP will not initiate.
• The BCM internal timer for the RAP expires after approximately 10 minutes.
• The BCM detects a decrease in battery capacity below a prescribed limit.
Systems powered by the RAP relay during the RAP power mode are as follows:
• A/T shift lock control solenoid assembly (w/ floor shifter)
• Power window circuit breaker
• RAP fuse
• Inside rearview mirror (DD6)
• Sunroof (CF5)
Serial Data Controlled RAP
RAP systems controlled by serial data are as follows:
Radio
Radio RAP activation/termination is the same as relay operation with 1 exception; the only door switch that will turn off the radio during RAP is the driver door open switch.
Vehicle Communication Interface Module (VCIM) (Onstar®)
VCIM RAP activation/termination is the same as radio operation with 1 exception; if there is an active call when the ignition key is turned off the VCIM will remain in RAP mode, and keep the radio in RAP mode until the call is terminated.

Do you know what a DTC - diagnostic trouble code is ?
DTC B1475 00: Retained Accessory Power Circuit

Your best bet , take it to a Chevy dealer !

1 Insert your key in the starter, start you car as you usually would and let it stall. Keep the key in the "On" position. In other words, don't turn the key back to the "Off" position. You will know the key is in the "On" position because you can use the A/C, radio and see all the lights on the dashboard when it is in the "On" position.

2 Wait until the "Theft Sys" light on your dashboard stays on without blinking. This will take approximately 10 to 15 minutes.

3 Start the car immediately once the "Theft Sys" light stays on steadily. Remember to not turn the key off. Your car will now reset the passlock system and start as usual.

Read more : http://www.ehow.com/how_7595689_reset-passlock-system-gm-cars.html

I would suggest you take it to a Chevy Mechanic/Dealership. This maybe a common problem inherent to this make/model. Sounds like a relay issue. Various recalls were issued for this make if I recall. Always good to have the dealer check those.

Does your truck have a locking steering wheel? If so try turning the steering wheel a little bit and holding it there then turning the key.

Get under the veh and check out ,the rusted parking brake cables

I will need the calibrate numbers to decode it for you

turn on key and press the buttons 2&3 together for about 5 seconds. a 3 digit code will show write it down then within 10 sec press am/fm button and another 3 digit code will display write it down. I can use this 6 digit code to get you your 4 digit unlock code.

run a fuel pressure test, if that checks out fine it may be a faulty coil pack or ignition control module

there is a solinoid that enguages the starter it is stuck tap the round cylinder that is atached to the top of the starter it should disenguage the solinoid if not try to hit it harder. dont beat it up though. it also may need a new starter.

Your vehicle as an ignition control module located on top of the distributor (under the cap and rotor) I would pull the ICM and take it to NAPA and have it tested if bad replace it (cost about $80). Sounds like a ICM problem or it could be the ignition switch located on the steering coloum which can't be tested but costs $20. Hope this works

the bezel around the instrument cluster and radio must be removed . it has 7mm screws that hold it on . once the screws are removed pull firmly . don't for get the two screws above the guages.