phxls400

None of the functions on the driver side work at at all on my 1993 LS400.

I pulled the rear panel for the seat, and tried to hear for a click...or motor turning. I hear nothing in this case.

I'm not sure if there is just a fuse for the driver's side seat or not, and where to locate it.
The passanger side functions just fine.

Ideas?

Rugster

I think there are two fuse panel locations, one under bonnet and the other above the pedals.. I might be mistaken but your owners manual should have the location listed for the seat fuse.

trukn1

Seat fuse is in the fuse box under the dash. Sounds like you have one gone bad.

phxls400

I pulled ALL the fuses under dash -- (the blade ones under the dash) and they looked good.

When I pulled the 30AMP door fuse (next to the blade fuses), I checked to see the passanger side which was now dead...and put it back like it was --- the passanger worked (like it did before) , but the driver side remained dead.

Is there a specific fuse for JUST the drivers side seat? -- if so can you post up a pic of which one it is?

I unbolted the seat as well to see if the main harness plug was loose and it looked fine.

Any ideas?

phxls400

Any ideas from anyone?

avalon42

iTrader: (1)

Probe a wire lead from the bottom of the seat until you hit a positive. If you do find power and its not working, then your motor is kaput. If there is no power, then you need to trace where you have the break in the circuit.

CUMan

I had a problem with the driver's seat in my 93 LS several years ago. The seat would move forward and back but would not move up or down.

It turned out that one of the motors in the seat had gone bad. I located a seat for a 93 LS at a salvage yard and ordered it. Removed the up-down motor from that seat and installed it in mine. That solved the problem.

As I recall, there are at least three motors in this seat. It is hard for me to believe that all these motors have gone bad, as would be the case if the seat would not move at all. It sounds more like electric power is not reaching the seat switch. If the fuse is good, there is some kind of failure in the wiring between the fuse and the switch.

phxls400

In my case, NONE of the functions work on the switch. So I was thinking that no power was going to the seat at all.

Any ideas on which is main 12v wire that comes into the main harness in the front of the seat?

I can try and jump from the battery directly, and see if it mysteriously starts to function.

Just plain weird that ALL the motors on that driver side seat would be dead.

Any other ideas?

CUMan

Sounds like you need a wiring diagram to help you determine which wire is carrying power to the seat.

There are Lexus manuals available which would have this info; however, they are very expensive, even if you find used copies.

Another possibility would be the on-line subscription services. They have wiring diagrams available. The Toyota/Lexus service is www.techinfo.toyota.com. Another service which covers all makes of cars is www.alldatadiy.com.

I have not had to use these recently; however, when I did use them in the past, they had a daily subscription rate that was very reasonable. You can download as much info as you need during your subscription period.

phxls400

I'd like to properly close this thread by saying I fixed the problem.

1. Unbolted seat and took it out of car.
2. Look at the plugs in the front part of the seat, and sure enough the plug on the left hand side under the skirt was unplugged (main harness plug to the ecu).

3. Plugged it back, in, put it in car, and it works!

Resolved. Thanks for everyone's help.

Och

iTrader: (3)

There are only two wires that are carrying power to the seat. All the other wires are for memory, heat, seat belt buckle switch and light, dashboard seatbelt light, and seatbelt tensioner switch.

Remove the seat, and find the two thickest wires on the plug coming out of the floor - these are the power wires. Test them with voltage tester, if they are live, then the problem is with the seat itself. Otherwise, the problem is somewhere else.