2003 Suburban. Fan would only work on 1-4 would shut off at 5. The next week the fan would not work. I replaced resistor and checked the fan (it works). Of course checked all fuses. Now the abs and brake lights are pin as well as the service 4wd warning. Checked the ground wires on there frame. All good there. Don't know where to go from here. PLEASE HELP!!

 

Did you do a full code scan, not just P codes as there are 4 code families. P, B, C and U. That's step one in any shop to help point way doing diagnostics, especially with ABS and all the sensors.