little red alarm light not blinking

[pastor scott.com]

Had my 04 burb in for new radio replace, now my little red light on radio for alarm is not doing anything. What does it mean, and can I reset somthing??

 

 

Scott

[GM-Tech]

Does the radio display "Cal Error" or "Calibration" when you first turn it on? The radio needs to learn the VIN of the vehicle, and perhaps they didn't properly set up the radio.

[facn8me]

I thought that unless you have a security code in it it doesn't blink. I believe my 96 monte is that way but I could be way off base.

[Lucky13MN]

That's correct, you need to enable 'TheftLoc' in order for it to work. Instructions should be in your manual.

 

Chris

[GM-Tech]

The 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 2 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.

[GM-Tech]

HOWEVER, if the radio is not properly setup up, they often work, but will display a "Cal Error" or "Calibration" message when first turned on. I suspect the red LED would not blink when the vehicle is shut off if this were the case, but I never really looked at that.