Re: Rear air problem
It will be Ok to pull fuse and run just to backup te advice given. If air is lost then You will be riding on the stops on rear of course with quite rough ride.
I have not looked at 03 but You chould have air holding tank on p;atform that pump is mounted on. They are plastic lines and possibly have a hole or tank could have a hole (not likely) unless exhaust got against it. Could be a bad connection on lines to pump.
If You are concerned about pulling fuse just in case something else may be controlled by it You can crawl under the back and look up to see air pump/tank unit and will see a plug running to it from a wiring harness. You can disconnect there and only issolate that setup of pump and tank. The unit is qute heavy but You can unbolt I think the forward bolts and lossen the back bolts so it will hang down and You could turn pump on and possble hear leak or feel it with hands.
I agree the relay would be the simplest to try first.
If I left something unclear do not hesitate to ask me to clarify.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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