Any GM tech's or folks with AllData able to pull relay wiring diagram for 2008 vette?

[dville_gt]

15 and 5 on BCM will need to be grounded together. After that your travel looks right but i would definitely look for ground coming in and out of the multifunction switch before getting too carried away with the rest.

ya, i'll just tag that white wire (pin 15) with my multi and see if it is getting ground first. the signal stalk would be the easiest but doesn't seem likely since the parking lights are coming on and i'd assume the switch hits them both at the same time when you manually turn on the lights.

[Big Pencil]

Just replaced the BCM in my 2000 SS. Seems that tiny stress cracks develop in certain solder points and cause intermittent loss of contact/power to various components - in my case, the radio, windows and top. I'd be surprised if that's your car's issue as it's much newer than mine, but thought I'd toss it out there just in case. Good luck running down the problem.

Steve in FW.

[dville_gt]

ended up being the wiring between the bcm and the underhood fuse/relay box. fixed now.