where is the location of the power seat relay on a 1998 ...

its is located under the drivers seat

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i called myself looking everywhere under the seat, i also got the relay number from a local gm dealer..their computer does NOT show the location of the relay. it is a common relay number used on many applications, i have the side panel off the seat, I have NOT removed the seat, so if you could be more specific on the location, ie right side, left side, front, rear..i just do NOT see it so far. i am leaving now for awhile, but i hope you can be more specefic as to the location, someone had already told me it was uner the seat??

im sorry all i have is that it is under the seat,i have done this before but it was a few years ago,i seem to remember having to remove the seat to get to it but i can not swear to it

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I already knew the Relay was supposed to be under the seat...I guess I should have worded my question more plainly. But I had been to the GM Dealer and the Parts Department showed a Relay but did not show a location, so I asked one of their Technicians who told me it was under the seat, but could NOT give a specific location. He also pulled a 98 Grand Prix Service Manual which showed a Relay on a 98 Grand Prix with the Power Lumbar, but did not show a Relay on one like mine without Power Lumbar...but the Parts Department used my VIN and showed it had a Relay. If it has one, it is not readily viewable uner the seat, the wires go down into an open panel under the carpet....that is my next step, to get the carpet up. I feel it indeed has a Relay because it has 6 wires coming out of the hole in the carpet. I know the switch is good, I just can't see all 3 motors going out at one time!

ok i checked the position of the relay on two different data bases,the relay is onder the seat,as a matter of fact there are two relays under the seat.however here is the diagnositic flow for this circuit.First check for a blown fuse on circuit # 340,this is a orange wire that goes to the switch and is the seat fuse.circuit #2040 is for the lumbar and is also a orange wire,this circuit also supplys power to the heated seat.from what you are saying and from the wiring diagrams this has to be a fuse or a power failure on these two circuits or the ground has been lostfor power on the two orange wires if you dont have power on these two wires(use a grounded test light) then check the fuses or check for a broken power feed wire(orange wire).if you do have power on these two wire then check circuit #C311 ground wire.

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I do NOT have Power Lumbar or Heated seat, so my car would not have a Relay for Heated or Lumbar seat! The seat has one control which moves the position of the seat. I have already checked the circuit breaker and it is good, i am getting power through the orange wire to the seat. I still do NOT know WHERE under the seat the Relay is located.

Hi Customer (name blocked for privacy). If you have the seats without lumbar support there isn't a relay for foward and backward and the same for the up & down switchs. The wires from the switch go straight to the motors. I will send a wire diagram. If you need more help let me know.Images available only to Customers.



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hi; thanks for this info...it was confusing because gm parts dept was telling me it had a relay, but the gm service manual was telling me what you state,"that only the lumbar or heated seat has a relay" . all the wires match your diagram, the note at the bottom that says, "each Motor contains an individual "electronic circuit breaker". do you know if these circuit breakers are located on the motor itself and if so, how do i reset them? or are they located somewhere else? you have helped most so far...i've now tried a hot wire to each plug in posts on one of the motors and it didn't move either direction...i also tried an ohm meter from each post on the motor to ground with 0 reading. it may be possible that all three motors have gone bad, but i was betting on the relay, since it doesn't have a relay, now i need to find the individual circuit breakers for each motor. the seat is setting as far back as it will go, so i can't get to the rear screws to remove the seat now. any help will be appreciated!

Is the electronic circuit breaker "self re-setting"? I just thought of that, the other thing i see in common is that all are fed by the same black ground..i will check the ground wires tomorrow, maybe it has a loose connection, it's very hard to work on this with the seat rolled completely back, if i could get to the screws and raise the seat up, it would be much better.

circuit #301 is the ground,its along the door jam(drivers door) the mootors are self re-setting.Remove the door seal jam plate and pull the carpet back to expose the ground wire

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Maybe you will still see this, i checked from orange to tan with ignition OFF and i get 12 volts WITHOUT moving the switch knob. with ignition on, when i move the switch knob to forward (tan is forward), the voltage drops to 0. I haven't been able to figure this thing out, if the seat was in the forward position where i could get to the bolts to remove the seat, i would be able to se all connections, but as is, the seat is all the way back and there's no way to get to tork bolts to remove seat. now, with switch connected, i get no movement in seat in any direction, any suggestions on what to specifically look for? thanks

The readings you are getting are all right. What you did was a voltage drop test accross the siwtch. When you are testing for voltage on the tan or foward wire use D for ground. In other words black lead of the voltmeter on D. Then use the red lead to test the tan or whatever wire you are testing. First test is to check for 12 volts on the orange wire. Use D for ground. Power should be there because it was there when you did the voltage drop test. Next test is to check for 12 volts on the tan wire. Use D for ground. Don't forget to push the switch to the forward position. Then test the light green wire pushing the switch to the back position. Let me know what you get.

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hi; i'm getting frustrated with this, could you let me know if this is an indication of a bad switch. when i unplug the switch from the wiring harness which goes to the seat and test the wires on the seat harness, i get 12 volts ONLY across the orange (hot) and black (ground) wire. I plugged the harness back to the seat and took the little plastic cover off the back of the switch exposing all the wire connections (2 to each motor and the hot and the ground) from there I get 12 volts from EVERY terminal individually tested to the orange hot wire. Both of these tests work the same with ignition either on or off and since i get 12 volts to the orange wire and ground with ignition off, i assume the seat will work without the ignition being on. Like I said before, it's almost impossible to get under the seat to test a motor individually with a separate hot and ground wire bypassing all the original harness, but if this is what i need to do, i will try to get someone who can get their hands under there to unplug the motors. thanks for your help!

This is wear your making a mistake. When you test each terminal individually you should have the black or ground lead of the voltmeter or test light on D the ground circuit. The red lead goes to each terminal one at a time. When you activate the switch say to the foward position check the terminal H the tan wire. With switch activated there should be 12 volts on pin H with the connector connected. then activate the switch to seat back terminal G should have 12 volts. Black lead on D and red lead on G. Test Check the rest of the terminal the same way except for terminal A. We already know it has 12 volts.

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Hey, i checked that and didn't do anything else and suddenly every thing works! if it quits i may call again but thansk for all the help! bobby

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