Please Help Chrysler Grand Voyager

PLEASE ANYONE WHO HAS ANY IDEAS TO ANY OF THE BELOW, PLEASE PLEASE HELP
IM BANGING MY HEAD AGAINST A WALL I HAVE A 2001 GRAND VOYAGER 2.5 CRD
LIMITED DIESEL WITH MANY PROBLEMS

ANYONE WITH ANY IDEAS ON HOW TO FIX A HEATED PASSENGER SEAT THAT WILL
NOT HEAT, THE SWITCH ILLUMINATES THE CONNECTORS UNDER THE SEAT PAD ARE
ALL CONNECTED, BUT NO HEAT??

THE POWER TAILGATE FAILS TO LIFT UNTIL IVE PUSHED THE KEYLESS REMOTE AT
LEAST A DOZEN TIMES, IVE TRIED WD40 IN THE LOCK MOTOR MECH CHANGED THE
BATTERIES IN THE REMOTE BUT TO NO AVAIL THE SAME THING STILL OCCURS
EVERY DAY PROOVING TO BE VERY ANNOYING WHEN THE RAINS FALLING.

THE OIL LIGHT STAYS ILLUMINATED IN THE DASH WHEN THE CARS KEYS ARE
TURNED TO THE CLICK BEFORE START UP, THE OIL LEVELS FINE THOUGH AND THE
LIGHT WILL GO OUT ONCE THE ENGINES STARTED SO IS THIS NORMAL??

AFTER STARTING THE ENGINE I WILL HEAR 2 CHIMES WHATS THAT ALL ABOUT??

ANY IDEAS ON HOW TO ACCESS THE COMPUTER ENGINE CODES ON A 2001 2.5 CRD
DIESEL, I WOULD IMAGINE THERE ARE PLENTY OF FAULT CODES IT WILL GIVE
ME.

LASTLY THE O/S POWER DOOR WILL DO NO MORE THAN OPEN FROM THE KEYLESS
REMOTE, IT WILL NOT POWER OPEN, HOWEVER WILL OCCASIONALLY POWER SHUT
VERY ODD.

ANYONE WITH ANY IDEAS TO ANY OF THE ABOVE THEN PLEASE GET IN TOUCH I
SOLD MY 99 ESPACE AS I WAS FED UP WITH ALL THE AGRO, NOW IVE GOT THIS
INSTEAD :banghead: