The solenoid is a can shaped looking thing and should be inside the black fuse "box" in the bay under the drivers seat. One side has a large red wire going to it the other side should be black. Once you see it, give a light tap with a hammer (no, I am not kidding) If the relay is stuck this may fix it.
It looks something like this.
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08 Holiday Rambler Vacationer XL 38PLT Workhorse R-26 UFO gas pusher,
2014 Cadillac SRX AWD, SMI Smart Box braking system.
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