1999 Chevy Silverado Power seat issues

Tiny
GOTECHSLACK
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 286,000 MILES
Hello. I am having an issue with my power driver's seat. I have the stated truck. The driver's side, bucket seat, powers back and forth, but not up and down (vertically). Does this mean that the seat motor needs replacing? If so, is it a difficult job to replace and where can I get the part? Thanks.
Monday, February 1st, 2010 AT 1:46 PM

7 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hi, Do the seat controls look like the picture? I'd have to check the wiring circuits before I could say about the motor. The switch is another possibility.


https://www.2carpros.com/forum/automotive_pictures/170934_silverado_power_seats_1.jpg

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Monday, February 1st, 2010 AT 3:16 PM
Tiny
GOTECHSLACK
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No. It only has the horizontal seat control. The horizontal seat control can be moved up and down on both the front and rear, of the control. Like I said, it works fine moving back and forth (horizontally), but when I move the control up or down, I can hear the motor, but it appears too "weak" to move the seat up/down. Hope this help. Thanks for your help.
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Monday, February 1st, 2010 AT 3:48 PM
Tiny
JDL
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I see, it sounds like the motor. I'd still want to check the circuits, though.
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Monday, February 1st, 2010 AT 4:14 PM
Tiny
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Ok. Thanks. Wiring circuits? Any instructions would be very helpful. Thanks again.

Michael
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Monday, February 1st, 2010 AT 4:19 PM
Tiny
JDL
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I'd remove the seat, go from there. If you can reach the motor connector without removing the seat, you can try that. For testing, you might be able to use jumper wires for voltage and ground, using inline fuse, to see if the seat will operate properly, if it does, the problem isn't the motor. If it does the same old thing, then I suspect the motor. Just to add, feel of the power seat circuit breaker, see if it feels hot, when trying to raise the seat. I believe the circuit breaker is 25 amp.
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Monday, February 1st, 2010 AT 4:29 PM
Tiny
GOTECHSLACK
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Great info, thanks so much. The motor is near the front of the seat, so I think I can get to the connectors. So, try to jump the motor to see if it operates properly and feel the circuit breaker to see if it is warm? Would the circuit breaker/fuse be near the motor? Thanks again.
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Monday, February 1st, 2010 AT 5:57 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I've been checking, probably not a good idea for you to diagnose. Under the driver seat there is an airbag module, that you don't want to fool with and three motors for the seat. You might be able to look at the power switch for the seat. You still need to disarm the airbags before you do anything. I don't advise using jumper wires on anything.
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Monday, February 1st, 2010 AT 6:47 PM

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