The seat adjustment switch,automatic tailgate and the steering wheel adjustment all stopped working at same time what to do?2006 QX56

Make sure that all fuses are ok, most modern fuse boxes on cars have little diagrams / pictures of what they are for.

If adjustment is electric check fuses in fuse box, if it is mechanic you need to take apart steering and seat, in this case is better to go to a garage.

See pg. 3-31 in owners manual. Start car in park. Adjust seat, telescoping wheel, and side view mirrors. Pust Mem button and then within 5 sec. push either 1 or 2. That button should light to show memory stored.
From the 2012 Guide (See link)
l"AUTOMATIC DRIVE POSITIONER (if so equipped) Two positions for the driver's seat, steering column and outside mirrors can be stored in the automatic drive positioner memory. Follow these procedures to set the memory positions: • Confirm the shift lever is in the P (PARK) position. • Push the ignition switch to the ON position. • Adjust the driver's seat, steering column and outside mirrors to the desired positions using the adjusting switches for each feature. • Push the SET switch and within 5 seconds, push the memory switch (1 or 2) for at least 1 second. • The indicator light on the memory switch you select will illuminate for approximately 5 seconds. • The driver's seat, steering column and outside mirror positions are now set to your preference. These memorized positions can also be linked to your NISSAN Intelligent Key®. For more information, refer to the "Pre-driving checks and adjustments (section 3)" of your Owner's Manual." https://owners.nissanusa.com/content/techpub/ManualsAndGuides/Murano/2012/2012-Murano-quick-reference-guide.pdf
For added info see whole owners manual.

You have a power seat circuit breaker in rear fuse box, that circuit is hot all the time. The orange wire carries voltage to seat adjuster switch. You need to check ground for adjuster switch, also.

If circuit breaker is overheating it will cause an open circuit.

check wheel bearings for condition and adjustment.

sounds like a wiring problem unless you are a mechanic take it to a dealer

If you are looking to open the hood of an Infiniti QX56, look for a lever somewhere on the side of the steering wheel or by the driver's side door. --------------------------------------------------------------------------------
Digiprog3

Since both problems surfaced at the same time...this indicates they are on the same circuit. Since both features would not quit working at once, I'd bet the farm that neither is getting power. I'd start at the fuse box, If all good there, maybe a relay. Also check all other power functions if these solutions don't work to see if anything else is effected.

interesting!... there is NO automatic adjusting control on the 2006 Sonata.

here's what you have to do:
#1. make sure the fuse to the seat adjustment is not blown, its usually a 10 or 15amp fuse.
#2. unscrew the cover to the controls on the driver's seat and make sure the harness is not loose or
broken, if the harness fails to attach to the control board correctly the steering wheel and the
seat adjustment will not work, this harness tends to come loose and even brake over time due to
the constant movement when you get in and out of your car.
I hope this solves your problem.

Rafael Reyes.