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Unsure if theftlock is operational on 2002 chevy impala. Red light flashes but radio is in need of replacement.Powers on and displays stations but no sound. Have seen some who have factory radio wired in trunk and aftermarket radio installed in dash. How is this done?

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3 Answers

How can I bypass the security code


Why do think the key security is bad? If you still have a factory key, this is not the problem...if no factory key, you can take your VIN number or original key to GM dealer to get new key that they will program for you...Check for dirty battery connections:)

Apr 30, 2015 | 2003 Chevrolet Impala

1 Answer

I own a 2002 Chevy Impala 3800. I replaced my factory radio, but when I finished installing the new radio my car now has a no crank, no start issue. What do I need to do with the immobilizer?


You can not just replace the radio in this vehicle with another type with out a interface module or something , I forget ! If you go to a stereo place ,where they install radios they will sell you what you need ! The factory radio is hooked to the Class 2 data bus an if other modules on the vehicle don't hear from it , it won't work !
The "Theftlock" theft deterrent system is a feature on all base and uplevel radios. There is no need to program a security code into the radio as in past model years. The theft deterrent system now utilizes class 2 serial data to determine if the radio is in the appropriate vehicle. Each time the radio receives the "run" power mode message, it compares the VIN information it has stored to the VIN information received from a module on the class 2 serial data circuit responsible for transmitting that information. If a mis-match occurs, the radio display will indicate to the user the radio is locked. Once this takes place, a DTC will set, the radio will not respond to any button presses and become inoperative. The two scenarios able to cause this condition are:
?€¢
A radio is installed from another vehicle


?€¢
A module which communicates on the class 2 serial data circuit which supplies VIN information to the radio is replaced and not properly setup with the correct VIN information for that vehicle

The only way to unlock the radio is by using a scan tool. Always refer to the table in this section to diagnose the "Theftlock" DTC for further information.

Apr 07, 2015 | Cars & Trucks

1 Answer

Unlock radio need code to lock radio mufflerman08@yahoo.com


Your '02 is too new to unlock on your own.

There are 2 types of GM Theftlock, Theftlock I and Theftlock II. The Theftlock I is found in pre 2000 vehicles, and Theftlock II is in the later models.


Theftlock I - Uses a volatile user settable code that is input through the key pad on the front of the Radio. If the power is lost (dead battery etc.) the code is gone and must be re-entered for the radio to work. But with the correct procedure the owner can unlock it.

Theftlock II - Uses an EPROM (erasable/programmable read only memory) or a PROM (the difference is you can not alter the prom once it is programmed).

In either case the code is burned in and holds even when the power is lost. With Theftlock II the radio is married to the vehicle by way of the VIN. When the vehicle is started the computer compares the number in the radio with the VIN in the body control module. If they match, the radio works, if not the radio displays LOC and you are finished, there is no easy way around it. The radio will not work until you make a trip to the dealer.


The dealer will use a TECH 2 scanner to change the VIN stored in the radio. The radio does not need to be removed (for the serial number or any other nonsense). The technician just plugs into the computer and resets the VIN in the radio.

Thank you for using Fixya and you may want to try pulling the fuse to your radio for 2 min and then reinstalling it. This may reset your radio and have the ECM recognize the radio matching VIN number to the Trailbalzer.

Jul 15, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

I had a low tire on my 2003 Chevy Impala; do not have a manual. How do you reset the "low tire Pressure" indicator light??


1 turn the key on
2 press the button on the radio that changes the station for 20 seconds or so
3 the settings display will pop up on the radio display area
reset the tire monitor there

Nov 22, 2009 | 2003 Chevrolet Impala

1 Answer

Disarming therftlock radio on 2003 Chevy Impala.


I think you may have read it incorrectly...you do not disarm it, you need to know the code, so when you are finished, you can turn it back on.
If you don't have the code the dealer can give it to you.

Jun 27, 2009 | 2003 Chevrolet Impala

1 Answer

Honda Radio button lights do not illuminate


were the lights working before?
sounds like a defective radio.

Nov 23, 2008 | 2002 Honda Accord

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