I have had my 08 Yukon Denali for almost 2 years and I really like the truck. Over this time a few things have stopped working and they really didn't bother me too much until the latest one yesterday. I don't think my heated washer fluid nor my rear defroster have worked since I got the truck. Then the rear wiper stopped working, next was the button on the liftgate handle to open it. The liftgate still opens with the remote and the button on the inside. The button on the bottom edge of the liftgate still works as well. The one last night that has put upset me was my power running boards. My wife was using it last night to pick our kids up from the after school activities and there is a 30 minute window between when they get done. Somehow she managed to run my battery dead but she got it jumped and it has started fine since. Since letting the battery die the running boards have not moved and are stuck in the closed position. I was thinking fuses but I just looked and from a visual inspection the running board fuse looked fine. At 5' 4" I really those running boards to make it easier to get into the truck. Anyone have any ideas?
Replace the battery unless it is relatively new, 30 minutes using the stereo/dvd or whatever should not create a no start condition. As stated the ground circuit is critical and factory fubar on these vehicles. I have the same year/model. I replaced the alternator, positive cable from **** fuse to alternator, added a ground from alternator case directly to battery ground, replaced the battery temp/charge module on the ground cable and now have a reliable system. if your battery is in good condition than it isnt being charged effectively. if your not mechanically inclined than this procedure could go very wrong in regard to polarity so find a shop/mech you can trust which imo is the biggest challenge you currently have. there is also a positive cable **** fuse 125 amp on the firewall and it may be coroded/fractured. Alternator $175, Module $26, **** fuse $8, cables/connectors $25. cost to configure/install by a "competent mech that cares" unknown????
Also, i am new to the yukon denali xl and am confused as to why it is refered to as a truck? or is your vehicle a pu truck with the yukon denali badging? i know it's a dumb question!