I have a 2005 GMC Yukon when I set the alarm and open the door just the lights Flash there's no horn

Johnnyfiver

2005 GMC Yukon

Johnnyfiver

I have a 2005 GMC Yukon when the alarm is activated and I open the door just the lights Flash no horn how do I get the horn to sound

PF_Flyer

According to the owners manual:

If a locked door is opened without the key or the remote
keyless entry transmitter, the alarm will go off. The
headlamps and parking lamps will flash for two minutes,
and the horn will sound for 30 seconds, then will turn
off to save the battery power

So the horn doesn't sound for two minutes. Might be what you're running into.