I'm really surprised how these seats are horrible for some, and fine for others. I keep thinking it has to be adjustment.
How are you adjusting the seat? It's too bad there isn't a default setting that positions everything in a certain way, then you can go from there.
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Looking at the diagram above, the order in which you should make adjustments starts with the bottom icon (seat forward or backward), then go counter-clockwise around that set of icons, with the lumbar support being the last one you adjust.
1. Set the seat forward or backward until your legs can comfortably reach and use the pedals (especially important if you have a manual with a clutch).
2. Next adjust the seat height up or down to where you like.
3. Then adjust the seat back angle. This one can be a source of back trouble if you're trying to make reaching the steering wheel only by adjusting the seat back angle. It can also affect your vision height which is a combination of seat back angle and seat height. If you've set the seat all the way down which seems to be common, adjusting the seat back will raise or lower your head. If you're trying to adjust your vision over/through the steering wheel by adjusting the seat, don't. Get the seat right first, then adjust the height/depth of the steering wheel separately afterwards. Seat back angle is also going to be determined to some degree by your arm length. If you have long arms, don't adjust for arm length by moving the seat back; adjust the steering wheel towards the front of the car. If you have shorter arms, don't move the seat forward; pull the steering wheel towards you. You can fine tune the arm length slightly with seat back angle, but arm length should be mostly adjusted for by moving the steering wheel.
4. Angle of the seat cushion. This is going to either tilt you backward, tilt you forward, or do neither if it's set flat. This setting shifts where the downward pressure of your upper body is focused, and is going to also have an effect on your lower back. If this isn't set correctly, trying to compensate with the lumbar support isn't going to fix it. This adjustment will affect the pressure points of your upper torso on your lower spine, tail bone, hips and underside of your legs towards your knees. Because everyone's body is different, there's no right way to set it, other than using where you feel pressure to adjust it so the pressure is as evenly distributed as possible. I have mine tilted towards the back somewhat, to minimize the pressure on my tail bone, and provide some support underneath my legs. This is going to vary if you have spine curvature issues, as to which part of your lower body you need to transfer the weight center to.
5. Lastly the lumbar support. Your spine length, shape/curvature and condition will determine what's comfortable for you. I have mine set so the lumbar support is low and pushing slightly forward. For me, this supports my lower back which is where I need the support. That's something you'll have to play with to find what's comfortable for you, but AFTER you've made the other adjustments.
Once you've got what you think is a good setting, then set your mirrors. Once you have those adjusted, save this to Seat Position 1. Over the next week or so, you'll probably tweak some of the settings, and you can use Seat Position 2 for your tweaked version until you have it all dialed in. Then save that to Seat Position 1. Unless 2 people drive the car, slide the seat all the way back, and set that to Seat Position 2. From this point on, when you are going to get out of the car, open the door and press position 2. The seat will slide all the way back without you having to hold the button. If you don't open the door, you have to hold the button in. When you get in the car, once seated and before closing the door, press position 1 then close the door. The seat will slide forward to your driving position.
Hopefully this will help at least some of you who are having seat comfort issues.