Question about 2002 Chevrolet Silverado 2500HD

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Theft Lock What is the theft lock sesquence for my 02 duramax? I did some work on it a few days ago and it seems to have locked up on me.

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  • Stephanie Wilson
    Stephanie Wilson Apr 27, 2009

    We have a 2003 Chevy silverado that we bought wrecked and the RDS radio is locked because someone stole the bottom screen that was in the console. How do we get the radio unlocked because I am going crazy with no tunes?

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  • Master
  • 341 Answers

GM DELCO THEFTLOCK RADIO UNLOCK CODE:
1. Press and hold presets 2 and 3 for about 5 to 10 seconds until you
get 3 digits on your display. This is the first 3 of 6 digits you will
need, so write 'em down.
2. After doing step one and writing down the code, immediately press
the
AM/FM button to get the last 3 of the 6 numbers you'll need, and write
'em down. (if you wait too long between steps 1 and 2 and the LOC code
displays again, just start over).
3. Call this number, it's a prerecorded message, so don't worry about
having to talk to anyone...1-800-537-5140. The voice will ask if
you're
calling for Chevy, Pontiac, Cadillac, etc... When you here him tell
you
to press "2" for Pontiac, press 206010 and hit the # key. He'll ask
you
for the 6 digit code that you've written down. Enter that and press
the
* key. He will then give you a code, and the option to get additional
4
digit codes, but one should be sufficient.
4. Follow the normal procedure in your owners manual for unlocking the
radio with your new code...press the hour set button on your radio
until
you get the first two numbers of the code, then press the minute set
button until you've entered the last two numbers. Immediately press
the
AM/FM button once the correct code is entered and the code SEC or
"secured" will be displayed on the display screen. Now, just turn the
radio on, and your ready to roll.
There is an additional step you can take to remove all codes from the
radio and start from scratch by entering your own personalized 4 digit
code so that it won't get you in a pickle again! Just repeat step 4
and
you should get a display screen that reads ---. This means the code is
out, and you can now program your own code. Of course, once you
receive
the 4 digit code from the GM recorded message, just keep it in a safe
place, because you can use that same code again and again should you
have any more problems with it in the future. Good luck, and yes, it
does work.

Posted on Oct 21, 2008

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Hi, does the alarm shut off when you unlock the passenger door?
If it does not I will give you a test that you can do.
1. disconnect the harness anti-theft control module. (loctaion depend were you live USA next to fuse panel Canadian models above the glove box.) Check the continuity between Light Green/Black wire and Black wire of the anti-theft control module.
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3. If continuity is as specified replace the anti-theft control module. If continuity is not as specified, check operation of the door lock switches.I will add that test at bottom.
4. If the door lock switches are ok check the continuity og LIGHT/BLACK wires between anti-theft control module and door lock switches. Check Continuity of BLACK wire between door lock switches and ground. Continuity should be present if Continuity is not present repair harness or connectors.
5. If Continuity is present, check continuity LIGHT GREEN and BLACK wire of anti-theft control module. Continuity should not be present with trunk lock in lock or neutral position. With trunk lock in-between lock and neutral position, Continuity should be present.
6. If Continuity is as specified replace anti-theft control module. If Continuity is not as specified, check operation of truck lock switches. If necessary replace trunk lock switch.
7. If trunk lock switch is ok, check Continuity og LIGHT GREEN wire between anti-theft control module and trunk lock switch. Check Continuity of BLACK wire between trunk lock switch and ground. Continuity should be present. If Continuity is not present repair harness or connectors.

DOOR LOCK SWITCHES
Disconnect 4-pin door lock switch connect (left and right front doors) With door lock in neutral, full lock or full unlock position, there should be no continuity between any terminal and BLACK wire terminal. Continuity should exist between LIGHT GREEN?WHITE wire and BLACK wire terminals with door lock in-between neutral and full lock position. Continuity should exist between LIGHT GREEN/BLACK wire and BLACK wire terminals with door lock in-between neutral and full unlock positions. If continuity is not as described, replaced door lock switch.

Hope this help its a place to start. let me know if you need anything else.

Cheers

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