Hi, I have a 2000 Express 3500 and recently the abs light came on. I hooked my scanner up to it and it through these codes at me; C0222, C0225, C0226, C0235, C0237, C0267, C0268, C0286. I realize that there is a common theme of shorts, or open circuts. I have checked the wiring to the plug but i'm stuck on one wire, the light green wire. It says in the wiring diagram that it is ind. ground. Should this be grounded all the time? there is no ground with the key on and even when i put a jumper wire on it, there is no difference. i have attempted to clear the codes a number of times with no luck.

Thank you in advance for any help.