lumbar problem..pump works, is it the switch?
Thread Starter
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
lumbar problem..pump works, is it the switch?
93 corvette:
Could the switch be the only other culprit?
I took the pumps arpart and both diaphragms were broken. Pulled them out of the motors and plugged the pumps back to the car. Turned the key, hit the lumbar button, no luck.
Took them to work and hooked them up to 5v, they both worked. Is there a fuse for the system? Or is the switch the only possible cause?
I also want to add that the power seats work on both sides, however the side bolster switch in the front of the seat does not work. It seems that the pump and the side lumbar switch power work together so i think they are related. A bad switch may cause both to not work?
Anyone with experience?
Could the switch be the only other culprit?
I took the pumps arpart and both diaphragms were broken. Pulled them out of the motors and plugged the pumps back to the car. Turned the key, hit the lumbar button, no luck.
Took them to work and hooked them up to 5v, they both worked. Is there a fuse for the system? Or is the switch the only possible cause?
I also want to add that the power seats work on both sides, however the side bolster switch in the front of the seat does not work. It seems that the pump and the side lumbar switch power work together so i think they are related. A bad switch may cause both to not work?
Anyone with experience?
Last edited by 9T3VETTE; Aug 31, 2010 at 10:09 PM.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
The 92 FSM shows all seat electrics routed through the power accessory circuit breaker. It does not show a fuse. You could use a test light to see if there is power to the switch, and if so, power to the pump motor. That should tell you where the problem is. If no power to these units, maybe the underseat wiring has a break. The front of the seat cushion has a wire bail that will unclip by hand or with a screwdriver to get at the wiring.
Thread Starter
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
The 92 FSM shows all seat electrics routed through the power accessory circuit breaker. It does not show a fuse. You could use a test light to see if there is power to the switch, and if so, power to the pump motor. That should tell you where the problem is. If no power to these units, maybe the underseat wiring has a break. The front of the seat cushion has a wire bail that will unclip by hand or with a screwdriver to get at the wiring.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
A circuit breaker is similar to a fuse, but doesn't need to be replaced. The ones in your car reset themselves when they trip. There are several of them, including the one for power acc. in the fuse panel at the right end of the dash inside the pass. side door.
Burning Brakes
Joined: Jun 2000
Posts: 913
Likes: 17
From: Chatsworth, Ga.
switch
93 corvette:
Could the switch be the only other culprit?
I took the pumps arpart and both diaphragms were broken. Pulled them out of the motors and plugged the pumps back to the car. Turned the key, hit the lumbar button, no luck.
Took them to work and hooked them up to 5v, they both worked. Is there a fuse for the system? Or is the switch the only possible cause?
I also want to add that the power seats work on both sides, however the side bolster switch in the front of the seat does not work. It seems that the pump and the side lumbar switch power work together so i think they are related. A bad switch may cause both to not work?
Anyone with experience?
Could the switch be the only other culprit?
I took the pumps arpart and both diaphragms were broken. Pulled them out of the motors and plugged the pumps back to the car. Turned the key, hit the lumbar button, no luck.
Took them to work and hooked them up to 5v, they both worked. Is there a fuse for the system? Or is the switch the only possible cause?
I also want to add that the power seats work on both sides, however the side bolster switch in the front of the seat does not work. It seems that the pump and the side lumbar switch power work together so i think they are related. A bad switch may cause both to not work?
Anyone with experience?
Burning Brakes
Joined: Aug 2010
Posts: 951
Likes: 3
From: Placerville CA
I took the pumps arpart and both diaphragms were broken. Pulled them out of the motors and plugged the pumps back to the car. Turned the key, hit the lumbar button, no luck.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
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Thread Starter
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
Commonly, repalcing the diaphragms will fix the issues. However, with mine they still did not work in the car with the diaphragms removed. When hooked to a power supply they do work. So it's some sort of wiring or switch issue, not the pump itself.
Burning Brakes
Joined: Aug 2010
Posts: 951
Likes: 3
From: Placerville CA
Yes I expected them to work. Normally the diaphragms break and bind the electric motor from spinning. When the diaphragms are removed it frees the motor and in most cases they pumps work.
Melting Slicks
Joined: Dec 2002
Posts: 2,390
Likes: 315
From: Belmont Michigan
Instead of buying high cost replacement parts, I bought a pair of rubber gloves for $1.79 and made my own. Found a great "how to" thread with a forum search.
Thread Starter
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
No. I took a test light to the power side and got nothing. Im kind of at a loss on this one.
I looked at my 93 fsm and didnt see anything for a power acc circuit breaker. Took a look at them in the fuse panel and there was no mention.
I just want my lumbar!
I looked at my 93 fsm and didnt see anything for a power acc circuit breaker. Took a look at them in the fuse panel and there was no mention.
I just want my lumbar!
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
On my car, a '92, the power acc. breaker is second from the bottom in the fuse panel. You likely do not have a bad breaker because some other seat functions as well as still other circuits go thru the breaker, and only some of those are not working. In my fsm, the section for the left lumbar circuits is 8A-145.I would start at the switch and test the wire back thru the harness especially when you find a connector in the circuit. You'll see the color code in the diagram. When you get to where you have power, you've found your problem.
Last edited by sailorsteve; Sep 6, 2010 at 03:04 PM.
Thread Starter
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
On my car, a '92, the power acc. breaker is second from the bottom in the fuse panel. You likely do not have a bad breaker because some other seat functions as well as still other circuits go thru the breaker, and only some of those are not working. In my fsm, the section for the left lumbar circuits is 8A-145.I would start at the switch and test the wire back thru the harness especially when you find a connector in the circuit. You'll see the color code in the diagram. When you get to where you have power, you've found your problem.
My electrical diagnosis skills are not the best but i probed everything under the seat that i could and found no power. Got to the point where the wires run under the carpet and couldn't get any further unless i pull apart the interior.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
Yeah makes sense. there must have been a change to the circuit breaker design since my 93 does not have a power acc. I dont have the manual handy but i believe it ran through the power seat circuit breaker. So i know it's no the CB because the power seats work.
My electrical diagnosis skills are not the best but i probed everything under the seat that i could and found no power. Got to the point where the wires run under the carpet and couldn't get any further unless i pull apart the interior.
My electrical diagnosis skills are not the best but i probed everything under the seat that i could and found no power. Got to the point where the wires run under the carpet and couldn't get any further unless i pull apart the interior.
Thread Starter
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
Suggest you put this project on hold until you can look at the wiring diagram, which will show you the location of connectors, etc. Also the manual has drawings in the electrical diagnosis section showing the routing of harnesses, etc. If you come up empty, and feel creative, you could fish a new wire to power the circuit. My '92 has a couple of fused leads in the console under the window switches, originally put there for aftermarket accessories. Maybe the '93 has them, too.
