How to replace drivers seat motor in 1999 caddy de ville

I have a 2003 Deville...battery is under rear seat ...pull seat up and out to raise....battery itself is very easy to change out.
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The IAC or idle air control valve is mounted in the throttle body and uses an air passage that opens or closes to increase idle speed where as an idle motor usually pushes against the throttle plate to increase idle speed most idle motors (stepper motors) where phased out and was never used on port fuel injected engines chances are you have an IAC valve

Front Wheel Drive

The original tire size for your Caddy is:

205/75-14

The oil pressure sending unit is behind the front engine mount. You will need a deep special oil pressure socket to remove and install.It is NOT an easy task. There is no short cut but you might find it easier to remove the oil filter adapter, if you do that you should replace the "O" rings on the adapter. The oil pressure sender is mounted on the filter adapter

Here is the firing order for that vehicle and engine.

it's in the thermostat housing that is close to a belt driven water pump on the driver's side. Thermostat is hidden inside this housing.

The only way I know to do this is to pull the seat and see what's wrong (the gears may be jammed, the motor burned out, etc.). Wiring diagrams are available at Alldatadiy.com

unbolt it from the floor should be 4 bolts unhook wires

A quick trip to the dealer would confirm but it sounds like your I.A.C. (idle air control motor) may be broken. I don't remember it being too expensive when I replaced it on my 95 caddy de ville. Also check out these symptoms-
Is your car idling properly?
Does it get rough under load or other conditions?
Any idle or off idle irregularities at all?
If so these symptoms may be linked to the I.A.C.
-Dynami