Lumbar does'nt Work

[MKIIISupraGuy]

I need help figuring this out. The switch and buttons look fine for the power lumbar control, and I have checked to make sure the wire harness under the seat is pluggen in. I can't find a related fuse to these controls in the fuse block. None of them are labeled "seat" or anything. The weird thing is the power seat part works great...it's just the lumbar controls....

--confused

 

[Jeff Lange]

So just lumbar isn't working? What about the side bolsters? Just checking.

Power is supplied to the seat slider, back controls and power windows from the "POWER CB" circuit breaker. There is a separate relay and fuse for the back controls though (to only supply power to them when the ignition is on), that fuse is the "GAUGE" fuse, which also powers the gauges on the dash.

If these other systems are working, and both the side and lumbar isn't working, I'd suggest it is either the switch or bad wiring.

http://cygnusx1.net/Supra/Library/TEWD/MK3/Main/Main_098.gif
http://cygnusx1.net/Supra/Library/TEWD/MK3/Main/Main_099.gif

Check for power and ground at the switch harness connector, then check if the switch is working correctly with an ohmmeter. Next check if the motors move when directly applying power.

Jeff

 

[MKIIISupraGuy]

ok thanks, I'll check the switch. It's the lumbar and side bolsters, regular power seat controls work fine.