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If it is flashing when the truck is locked from the outside with the remote then it is because the alarm is activated (which happens when you press the lock button twice in most vehicles). Othewise there may be some other issue that you should have checked out by a Chevy dealer.
no alarm installed
the flashing security light in the dash is not flashing and vehicle will not start
break the lightbulb.
To disable the seat belt alarm on a Chevy Colorado, locate the alarm fuse. Pull out the fuse to disable the alarm.
it is a component of the alarm system
The flashing lights are probably the factory alarm.
There is no reset. If the alarm goes off while driving and you are buckled in, you need to check the wires going to the seat belt buckle.
You probably need to change the filter.
The easiest way to disable the 1998 Chevy Lumina factory alarm is to remove the factory alarm fuse. The factory alarm fuse can be found in the fuse box.
Alarm system is armed.
Go to seat belt alarm stop.com