I have a 2016 Grand Tour. On our current trip an erractic and unpredictable alarm from the the Light Control Bar Unit (LCBU)kept coming on related to the Parking Brake warning. What was also weird was that the backlight for the display would flash on/off every time the Parking Brake icon would flash and the beeper "beeped". I checked the Parking Brake switch and it seems to be fine. I then called FCCC tech help and he thought it was a grounding issue. I checked all grounds that I could find and tighten everything.
I still had the random problem while driving or sometimes just sitting still while in gear. I thought the LCBU might have a short so I checked the connections and pressed on the face of the LCBU. Then I noticed that if I put my hand near the LCBU the problem stopped. I called the FCCC tech again to see if there might be a photo sensor or something on that display. The tech mentioned that there might be a "Coach" installed starter lockout connection causing the issue. Then I thought about what I was doing different to stop the issue...and realized they every time I leaned forward off the lumbar part of the seat the issue stopped (I was leaning forward when I would put my hand near the LCBU on the dash.
This evening I was at a campground and looked under the seat and saw a very loose connection on my lumbar switch for the seat. For some reason that "lumbar" switch has 4 wires connected to it. I pressed the blue wire (loose connection) into the switch so I'll see if that fixed it when we travel again on Friday.
Any ideas as to why a Lumbar connection would trigger a Parking Brake warning??
By leaning forward and backward on the lumbar section of the drivers seat it really seemed to be creating and solving the problem.
Any help or thoughts would be appreciated. I do plan to call Winnebago tech support tomorrow.
