02 Yukon Interior Light Flickers

[ladybridge]

On my 2002 GMC Yukon when entering the vehicle, the "SECURITY" message flashes. The "SECURITY" goes away when the ignition is at the on position. When the Ignition switch is iswitched to the off position, the "SECURITY" messages flashes again.

 

The switch for the interior light is pushed in so interior lights are off when door is opened. Ever so often the interior lights flickers and the CTSY LP relay clicks on and off intermittently. The INADV PWR relay is constantly hot to the touch. When the ignition is turned off, the CTSY LP relay clicks on for barely a second so the interior lights flicker. After a minute, this occurs again. When driving the light flicker also sometimes occurs.

 

What is causing the interior lights CTSY LP relay to click on and off intermittently?

 

I disconnected the cable from the negative battery post for 5 minutes, then reconnected cable. The problem still occurred. I pulled out the PRK LP, RRFOG LP, INADV PWR,and CTSY LP relay, then inserted them back into the wire harness. The problem still occurs. When removing the plastic cover for the wire harness, the CTSY LP relay clicked more frequently.

[02suburbanZ71]

Sounds like a bad bcm. The dealer should scan for bcm codes.