So got tired of working on the seat so fig id post a howto fix your 140 Rheostat (dimmer switch)
This will be the 4th one Ive fixed now. First time for my car. Every one else has just been jumping the leads on their dimmer. This does not fly for my application because i hate bright green lighting at night and I'm putting red leds in there and don't know the brightness and want to be able to dim them.
First remove the knob. You have to be careful they break.
I put a rag around the knob and wiggle and pull up with pliers.
Remove the two Phillips screws on the back and pry up right were my screw driver is.
You should see this.
This is where you will be puttin your digital multimeter to test your dimmer to see if its the dimmer, the board, or where they connect. as you can see there is lots of corrosion on it but ya never know.
So you have connected your digital multi meter to the plugs and set it to resistance in ohms. Move the dimmer left to right stopping periodically. If the resistance moves up or down when when moved in one direction finishing at no resistance 0.00 and the other way no reading at all your Rheostat is good. Move onto checking the board or where it connects to the board. Also in the full on position it should read 0.001 or less resistance. As you can see in the photo mine reads no sig so its the Rheostat.
Pull the locking tabs up on the back of the Rheostat. It will come apart. Be careful !! there are 2 springs under the copper plate! As you can see in the photo mine needs allot of cleaning.
Here is the back side. Ive already clean the center part a bit by scraping with a small eyeglass flat blade. Note: this copper is soft stuff. Take your time cleaning with any sharp items or it will gouge it.
After scraping i used a brush to clean it up a bit more.
Then some steel wool.
Here the plate the sits ontop of the 2 springs cleaned up.
Put it back together the same way it came apart. May take some time aligning them springs on the plate. Use some dielectric grease to keep corrosion from coming back quickly.
Now its 0.00 in the full on position and it gos up as i turn it. yaaaa fixed.
yes my multimeter led screen has lost 2 bars
guess i have to work on the seats again.