Originally Posted by
J57ltr
Chances are that whoever installed the alarm just did a halfass job. Most of the time when these cars have an alarm installed with remote start the installer will just wrap a few turns of wire around the ignition switch and a few turns around the key and hides it in some electrical tape in the dash. This gives the vats system fits because it "sees" 2 keys at the same time. The pass key 3 system uses transponders that are built into the key itself and work exactly like the antitheft tags at stores where if an active tag gets near the transceiver near the door it will cause the alarm to sound. Basically when the key is turned the BCM sends out a signal from the ring around the switch that says "who's there" the key uses the energy to say "it's me, open up!". When there are 2 keys present the BCM asks "who's there?" The key responds "I am, open up!" And the one on the dash says "me too!". This causes issues and needs to be addressed by adding a relay to cut the loop when the remote start is not enabled or using a databus module to bypass the system.
06-17-2016
