Chasing an intermittent C1114 which alludes to either the Integrated Trailer Brake Module is bad or has a wiring problem or the SSR is bad. I know where the ITBM is located but cannot find the little relay under the truck. It's supposed to be above the spare tire hoist but it's not. I've looked at both frame rails on the sides (outside mostly) and followed the 7-pin wiring harness all the way to the fuel tank but must have missed something. So, for those of you in the know, where is this thing on a GMT900 Suburban or Yukon XL???