...the schematic for 4x4? I could use the 4x4 for the winter, I check the fuse for the system,it was ok. Is there a control module for the 4x4, that is separate from the main computer? I can located the problem if I can find the wiring for the 4x4 system. the auto repair manual like Chilton, does not show nothing on how the system works, wiring or other wise. I can push the button on the dash, the indicators lights are not coming on. Please any help would be appreciated.