03 gmc envoy C0265 code

figured since this applies to most gm and chevy light trucks and suv's I would post it up.
had an 03 envoy in the shop for a service brake system message in the display, brake light on, abs light on and traction control fault light on.
everything was intermittent. had recently replaced abs module for another fault code.
hooked up auto engenuity and set to 4wal, put left front wheel speed, right front wheel speed and rear wheel speed in the displays and went driving. after about a block all went blank, right hand turn all came back on, about a block all went blank again, right turn all came back on.
after about 2 hours of troubleshooting found wiggling the harness going to the abs module while running made lights go on and off.
tightened the center of the spade clips on the power in harness and all problems gone!

Where is the ABS module if this ever happens to me I need to know where to look!

inside frame rail about under the drivers feet.
also the ground wire for the abs is a known problem. it is on the body mount frame on the outside of the frame rail opposite of the abs module.

I am keeping my fingers crossed I have a 2003!