Cadillac STS Forum - 2005 through 2012 Discussion, 07 STS Radio "Theft Mode" in Past Cadillac Vehicle Discussion; If I disconnect my CD Changer (Denso Unit in the dash-part of Navigation system) will the radio go into Theft ...
If I disconnect my CD Changer (Denso Unit in the dash-part of Navigation system) will the radio go into Theft Mode and lockup requiring the dealership to charge me $125 to reset with my VIN Number? I am seeing posts saying to disconnect battery cables, radios, etc none mention the radio shutting down to protect from theft.
I know on my 03 deville that when the battery was replaced, the radio shut down and required the dealership and $125 charge to get it working again.
The changer has locked up with 5 CD's of a book I was listening to. It was locked up with 6, but I saw a bit of one hanging out and helped it with another cd and it spit it out(#6) but it willl not play or spit out any of the others. Comparing these commercially produced disks to blank CD's, they are a bit thicker, that may have done it, I don't know.
Both cars (My 2003 deville and the 07 STS are used, the STS considerably newer and purchased from the dealership that sold it new and with a carfax.) Is it possible that the 03 deville had a replacement radio that required the radio reset when the battery was disconnected because it did not originally come from that car? It was obvious that there was some aftermarket radio work done on the car that was restored when sold to me. There were very thick speaker cables running under sill covers to the dash that were cut off, like someone had aftermarket and restored to factory. the speakers in the doors are replacement(Kicker) and there are also cut-off wires going to the trunk.
That might explain how people are disconnecting batteries, radios, without the same $125 dealership experience.
Absolutely agree with the above. The VIN is stored in an EEPROM which will retain the VIN despite the battery being disconnected. GM has been using the VIN comparison method for a number of years now but implementation was staggered in different vehicles. My friend has a 2000 Chev pick-up and you must set and record your unlock code through the faceplate in case you ever lose power. The drawback to this system of course is a battery discharging if you don't know your code. The Pontiac Bonneville however started used the VIN comparison method from 2000 forward. Other vehicles, if I'm not mistaken, were a little before 2000 and some after. The key to this type of theft deterrent is the presence of a Class 2 Serial Data Bus or GMLAN Bus (dependent on vintage). One or the other is necessary for the VIN comparison method to work so the implementation generally occurred once the new architecture was built into the vehicle. A defective radio may produce a different result.