The sending unit located in the gas tank must be replaced on most of these cars you can gain access to it by removing the back seat revealing an access cover allowing you to get to the sending unit remove retaining screws or locking ring and replace. You probably should be grounded and have a Haynse repair manual handy to walk you through this job it's not the easiest job but not to hard either unless the gas tank must be dropped down to access the sending unit if that's the case have a shop do the job that job is pretty tough.
I dont know if the above recommendation worked for you, but for me the instrument cluster lights weren't working and the fuel gauge needle didnt move. I removed the instrument cluster and following a website, i had a tv repair guy replace the 3 capacitors which the website advised of and now the gas needle moves and light is back on, i spent about $50 bucks for the sodering work.
Which capacitors were replaced and what website recommended it?
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The LS400 tank is located between the trunk and back seat so you don't have to "drop" the tank to access the pump or the fuel sending unit.
The sending unit is on the back side of the tank and can be accessed through the trunk. There are 4 Phillips screws holding a cover over the tank in the trunk. These screws are near the rear speakers.
The pump is on the front of the tank and can be accessed by removing the rear seat. The bottom cushion is not bolted and can be removed by pulling up on the front edge and sliding forward. The back cushion is held down with 4 bolts near the bottom. Once removed you can slide the rear cushion up to remove it.
When removing the pump, DO NOT CUT the wires going through the front plate. There is a connector on the rear of the tank near the sending unit and the pump (inside) has connectors on it.
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
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•
Oldsmobile Temperature Gauge Lamp Switch?
-----------------
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
------------
http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
------------
http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
-----------
http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
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If
all voltages checked ok, then most probably its faulty instrument cluster board
on which gauges are connected. Yes if cluster circuit board looks ok, then also
it can be faulty. Somewhere there is minute short or burn on board then such
problem arises.
Also
check the fuse box. One under hood and other under dash.
Inspect
each and every fuse and see if all are fine or not.
---------------
For
more troubleshooting on these cluster gauges I suggest you to refer the list of
help links mentioned below. Its step by step instructions will help you to
confirm the exact cause of problem in these conditions: ---------
Click
the link below: ------
2004 Toyota Tundra:
Oil Gauge and Temp Gauge Not Working?
http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html
--------------
2005 Lexus SC430: Fuel Door, Dome light and Fuel Gauge Fuse
Location?
http://howtobyme.blogspot.in/2012/05/2005-lexus-sc430-fuel-door-will-not.html
----------
Toyota 4Runner:
Temperature Gauge Sensor
http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html
------------
Temperature gauge sits over half way mark?
http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
---------------
Heater blows intermittently and temp gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html
----------
Temperature gauge does not move and no heat when heater is
ON?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html
-----------
2003 Pontiac
Grand Prix: Erratic Fuel Gauge?
http://technoanswers.blogspot.in/2012/06/2003-pontiac-grand-prix-erratic-fuel.html
-----------
Temperature gauge keeps fluctuating up and down close to
red?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html
-------------
Temperature gauge on the dash quit working on Pontiac Grand
Prix?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html
---------------
Fuel gauge jumps from empty to full?
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
--------------
Gas gauge stuck on empty on 2002 Mercedes Benz 240c?
http://repairhelpcenter.blogspot.in/2012/02/gas-gauge-stuck-on-empty-on-2002.html
---------------
• Oldsmobile
Temperature Gauge Lamp Switch?
-----------------
Fuel gauge drops to Empty?
http://technoanswers.blogspot.com/2012/01/fuel-gauge-drops-to-empty.html
----------------
Dodge neon gauges not working?
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
------------
Temperature gauge went up?
http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
------------
Temperature gauge stays At cold on jaguar?
http://technoanswers.blogspot.in/2012/02/temperature-gauge-stays-at-cold-on.html
-----------
How to replace Instrument panel and dashboard on Toyota
car?
http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
-----------
How to remove instrument panel on Chevrolet car?
http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
-----------
How to remove control panel on Buick regal?
http://howtobyme.blogspot.in/2012/02/how-to-remove-control-panel-on-buick.html
---------------
These
details will help.
Thanks.
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