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Cadillac Repair/Doors unlock on their own
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Question
Hi Rob,
I recently spoke to Matt and he helped me with my trunk door. It would unlock on its own and he suggested disconnecting the cable from the actuator under the trunk door. Lately, though, my doors have been unlocking on their own. I don't want to disconnect anything from the door. How do I get it to stop. And how do I get my key remote to electronically lock and unlock my car doors and my trunk door again and work how it should work. Can I do it myself? Or can I take it to an alarm shop? Hopefully not, but is this something only a dealer can do?
Please help.
Thank you very much,
Ana Jauregui
Hello,
I am not familiar with Matt.
There are far too many things you have not told me. I need the year, make, model. Are these remotes factory or for an after market alarm.
As for the doors unlocking, the year is important because it wasn't till the 2000s that factory locking was not affected from RF (radio frequency). There was only one code and there were many things that could cause the doors to unlock by themselves. Other people getting into their car using a remote. Garage door openers etc. In fact, there were black boxes that were sold to copy the code in order for unauthorized break in.
Before 1995, one could drive through an alley with their garage door opener and open other garage doors. That is when they went to code hopping where the code changed. In 1994, after market alarms went to rolling code.
The car manufacturers went to rolling code much later.
As I said, I need more information.
http://www.autotheftexpert.com
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Rob Painter
Expertise
Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?
Experience
Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.
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