childb1

I have a 99 with memory sport seats. The lumbar motor decided to start by itself the other day. I pulled the fuse for the lumbar motor, but the relay was still on in the seat control module (SCM) and drained the battery in a couple of days. So I pulled the SCM module fuse and now the current drain is back to normal but the drivers seat no longer works. I've looked through the threads and I've taken both the SCM and switch module out of the seat and looked for broken solder joints, burned up diodes and bad electrical connectors/broken wires. I didn't find anything that would point to something I could repair on my own. Looks like the SCM 09360841 is hard to find and the switch module is about $150 if you can find one. I was wondering if anyone in the Phoenix/Glibert Arizona area had one or both of these that I could swap out to find which one or both are the culprit. I don't mind paying for the parts, but I don't want to buy a new one if I don't need it. Also wonder if the non-memory module would work in place of the memory module, that would at least allow the seats to work again - I leave the memory turned off so I don't wear out the seat tracks.

Thanks,

78GEN3

Kind of a hack, but maybe a bypass switch to restore the power to the seat when you want to move it.

Smoken1

Did you check to see if you have any codes?

childb1

With the SCM fuses out it indicates loss of communication - thus no codes. I could put the fuses back in and see what codes it throws. Looking at the 1999 DTC codes I couldn't find anything related to the lumbar pump. It lists seat switch DTC codes, but the seat movement works fine.

Not sure I want to hack another switch into the circuit. I want to fix it right, just need to find someone who has a spare SCM I can substitute to see if that's what I need.

Brian

TastyBacon

I think this can happen if the air bladder in the seat is leaking. I had the pump motor in my passenger's seat start spontaneously kicking on and off last fall and I believe this was the cause. I used the control on the seat to deflate the air bladder and it stopped.

Smoken1

You could try this-
http://forums.corvetteforum.com/c5-t...nger-seat.html

ralphthedog

My drivers side memory seat also went bad. It would pin me against the dash or move all the way backwards. I was able to get the seat into a comfortable driving position and I removed fuse #35. I think it's the seat motor fuse. I am also looking for a replacement seat module 09360841 but can't find any. (For more than a year now) GM stopped making them and I guess no other manufacture makes them. With all the C5 Corvettes out there with this potential problem we may need a large supply of these modules. If you ever find some these modules let me know, I'll keep looking for you too.

dutch911

I am also having trouble with the drivers seat motor where I've disconnected it. Are Driver & Passenger seat motors same? Can I just swap them?

dadaroo

OK, first of all, the SCM has nothing to do with the Lumbar control. Here is the schematic for the Lumbar control. The SCM fuse feeds the SCM and the Lumbar switch which then provides power to the Pump internal controls. The Lumbar fuse provides the actual power for the motor.

https://www.dropbox.com/s/g5ekfnerqt...umbar.pdf?dl=0

Sounds like you have 2 separate issues going on with the seat.


After you absorb this let me know if you need more schematics for the seat. If so I need to know if you have a telescoping steering wheel or not.

If you pull the Lumbar fuse and disconnect the Lumbar switch connector and you have a drain that will prove you have two separate issues.


Mr. Sam