No, I'm not talking about a Gen 3 with memory seat. I couldn't find anywhere about this, so I'd figure I'd ask. I got a driver's side CT200h power seat with heat AND memory. I hooked up power and ground as well as a big pink wire (I believe is 2nd positive) and the lumbar works, but nothing else. I can't move the seat forward, up, down, or back. I can only inflate or deflate the lumbar support. I have heard that if you have a memory seat, that the memory seat function and wiring will have to be bypassed in order for the seat to function. Is that true? If so, what needs to be bypassed? I like the seat, but not sure how to get the rest of the seat to function. Thanks in advance.
Pictures of the plug. Do you know the pinouts ? Like from the service manual. Are they're extra plugs on the Prius underseat area??what are you working with . Factory schematic? Did you get both sides of plug from Lexus?
I don't have the diagrams of it, but I figured out from one of the threads that ground is the big green wire and the power is the white/black striped wire. That is what powers the lumbar. It also seems to be getting power to the motors from what I could check. I do have both ends of the plug. No extra plugs from Prius unless they are buried somewhere under the carpet. Kinda fiddled around and could find them. The airbag and the seat sensor/seat belt clip wiring those both are plug and play. I'm having to wire up the power and ground for the power functions of the seat from scratch. I'm running power from the battery with a 30 amp inline fuse. Here's the plug on the Lexus seat.
I have traced it back to determine that the three wires at the top are for the heater switch. The green wire is ground, and the white w/ black stripe is power. I believe the pink wire is the second positive, but not exactly sure.
I'd really like to install this, but now I'm wondering if it's possible due to the memory feature. If the memory seat wiring isn't an issue, I'm wondering if the seat motors are bad, since the only thing that works when power and ground are hooked up is the lunbar support. I'm also wondering if it would be easier to have installed a power seat out of a Prius instead of a CT200h? Any advice would be greatly appreciated.
This is my point I don't know this later model Gen 3 that well If the Gen 3 was available with power seats usually underneath your non-powered seats the plug or plugs looks like just one should be there usually they don't change a whole harness to add a seat It goes down the assembly line in the harness is preloaded into the car ready for every available option generally speaking and then is it continues on down the assembly line whether or not it's getting power seats and rear window defroster and what ever the heck it gets or it doesn't. This is why I asked if you can find the mate to that plug somewhere well obviously under the seat area of the car you're working with If you have the diagram which I think could be downloaded from somewhere on the web pretty easily you could see the pinouts to the plug and see if you're dealing with any relays and things like that which would the heater I would think is quite possible Do you have the passenger seat to match? If so put power to it while it's sitting out on the floor and see what can happen You can also use something where you can strip the positive and negative off the motor wire or make a spot like you pinch the wires for some testing just to see if you can put some juice to the motor and make one of the motors go forward and backwards or up and down or what have you without the plug involved at all just to see if the motors work I highly doubt the seat motors would just be bad I mean it is possible but there could be relays and weirdness that might need to be dealt with from the car end again that's why I was wondering if the plug was buried under the seat like the O2 sensor passes through the floor the what would be a transmission tunnel to get to the O2 sensor The plug would probably be buried under the carpet that's a good assumption probably have a black rubber cap over it to keep water and whatnot getting in the plug too. Even if I don't own the car then I'm working with wiring diagrams for the system that I'm working with usually help me greatly to determine pin outs without just banging power on wires Toyotas pretty normal on power and ground wires and all that but still.
Okay. Well, that makes since, as I do have the power seat and heated seat fuses in the fuse block in the driver's kick panel. I will have to look to see if I can find the plug. I do remember, doing some work on on other Toyota's and maybe even my own Prius, but it has the wiring and relays for the fog light, so that makes since to have the relays and plugs for the power seat. Thanks.
Generally today that's how most cars are built in production The wiring harnesses and the hard parts inside the car that would be to replace if you wanted to add another option electrically they're there just a few little quirks relays whatever needs to go and you have the setup for that option so I would look hard at the car and see what you got If it's just a matter of adding a relay in the box and pulling a plug out from under the carpet you're golden you would see that possibly on a full schematic of the car that you own and are trying to modify forget about the Lexus diagram for a minute we know how it works there but look at the Prius diagram for a car that would have power seats and look at the power seat section which is probably the body section and then it will show you what relays in the factory manual and the plug looks like generally speaking and it'll show you the relay and its position in whatever fuse box it's in and then you can lift that fuse box cover see the relay not being there look down in the little slots that the relay plugs into and see the brass connectors for the relay to drop into then you know the wiring is pretty much in place find the plug.
Well, @Tombukt2 , before I went to finding the plug in the car, I wanted to make sure the seat motors actually worked. I have traced the wiring and have discovered that the switches apply ground when they need to have the seat motors or lumbar pump work. It reverses the polarity on the motors if you want to go the opposite direction. The power lumbar switch gets power through the power seat switch. So, the wiring is correct. I even found out that seat works without the memory seat wiring plugged in. So the memory seat function has nothing to do with how the seat functions. I hotwired all three electric motors and they all work. Both forward and reverse. And from the testing I did with the actual seat switch, I believe it's bad. It's not providing a ground to the seat motors when needed. So, that's what I'm working now, getting a switch.
Absolutely but if I know my car has the wiring I could just set the seat on the floor and plug it in without putting the 14 mm bolts in to take the seat out as a 5 minute operation generally speaking with the seat belt clip on the side of the seat and all I take mine out to clean under them sometimes. And they're just sitting there on deck right next to the car if I had a power seat and pad the plug I just sit it on the floor and plug it in and turn it on see if it works then I don't have to splice and do anything but either way works but say if it didn't work that way and you put power to the wrong wire just because and then you well something didn't work after that you might never know if it was supposed to work but either way the gremlin seem to be worked out now we need a plug in the car and a seat sitting on the floor and a few bolts it looks like so you're well on your way. Switches should be a few junk yards away might even work from other models with seats that are movable electrically
I agree. That's what I'm going to do now, in between getting the switch. And yes, I'd rather not have to splice the wires. I keep you posted.
@Tombukt2 So I figured out that I and the positive and negative reversed, so I fixed that and everything worked except the up and down movement. I put the new seat switch on and it still doesn't move up or down. I tested the wiring and it seems that the up and down motor isn't getting power. The switch is getting power, but not that one motor. Any suggestions on what to look for since both switches have the same issue?
I looked for the factory plug, but couldn't find it. I took out the floating bridge and still couldn't find it.
So with the CT 2008 seat do you have the seat side and the car side of the plug when the seat was removed or did they unplug it and you just have the female part of the plug? Sometimes the other end of the plug has funny things on it like wires jumping out the end and going to another pin not saying the seat does but sometimes you need to see that other plug or have it get it out of the car whatever I'm going to guess that the top line Prius with the electric seats has a different wiring harness yeah okay sounds great I guess I wouldn't think but today I don't do a lot of thinking they're doing that for me. Do you think when you have the power wires reversed you could have damaged I guess it's the up and down motor we're trying to get to work If you direct wire the up and down motor will it work you'd have to have some sort of a schematic or be able to look at the connections on the motor and get an idea of what is who so we need to determine whether the motor is actually burn up but you're saying I guess you're able to somehow connect your test meter and verify that when you push the up or down button you're getting no power to that seat motor but you are to the back and forth motor and maybe the seat heater works? So it's just that one up and down business that's not working? And you are verified this by testing power output to the motor from the switch with power supplied to the switch hopefully properly and so if you don't have the car side of the plug from the Lexus I'm not sure what you're doing you found the plug that's similar and plugged it in and are using the wires off of it looking at the wires on the seat side?
So yes, I do have both ends of the connector. I have it wired up, and yes everything now works except the up and down. I have it in the car and I'm able to drive it, but the seat just doesn't go up and down. And yes I tested the switch and it's not supplying power to that one motor. The others are fine. I hooked up 12 volts to the motor and it moves both up and down. The motor is still good. I got my "new to me" seat switch and it does the same thing. No up and down, but everything else works. So I know the original switch still works. From what I figured out, and traced the wiring, there are two positives. One for the heater, and one for the seat. There is only one ground. I even tested it and hooked both positives up and it doesn't make any difference.
These are the wires. The green is power. The white with black stripe is ground. The small wires are the memory functions (not being used)/heater switch wires. The bigger pink wire is I believe the power for the heated seats. It doesn't do anything for the power seat functions when you hook up power to it.
Well lucky when I get to trying this I guess I'll get to see what's going on in my case personally I'd be able to set the up and down and probably never touch it again just because it's like that and I said almost straight up and down in the seat like a race car driver literally my back is almost 90° to the seat bottom 84 or something degrees so there you go But I honestly have no idea buddy that sounds absolutely ludicrous I mean I don't think there's anything else in the car that would have anything to do with your seat going up and down from some other point like none of these seat buttons are on the steering wheel of any of these cars as far as I know. So everything you have there should work as connected I mean I can't see how it could be messed up personally but I am not an electrical engineer like several here are personally at this point I would move on to things that keep my interest better set my seat at least I can move it for and a half and I have a heater if that's a big thing but I honestly don't know I am more surprised that the plug is not in the car that's what interests me even more but at this stage of the game that's just the way United States Toyota is requiring Toyota to build the cars for our market or something like that It's got to do with money that's for sure.
And what are the other plugs pictured sticking out of that black Romex looking material this harness has three or four plugs this seat has three or four plugs on it seriously wow when I'm over at the spot where the CT is I'll have to tear some mess out and just have a look just because that's quite interesting.
The big white plug is a common ground "dummy" plug. The other little plugs are either for the seat motors or the seat heaters. It's an interesting wiring harness.
Yeah and Toyota's wiring can get pretty interesting when you have multiple plugs on a harness for one device like that so that harness there's no place for that to plug in to the Prius underneath the seat area along the side rails the tunnel under the carpet whatever there's no place for that to plug in at all If not then it looks like I haven't looked at the dealers pictures for parts but there will be a completely different floor harness I guess that is possible in these American cars now and no Toyota did not use to do this but in the interest of selling more parts and all that it's a perfect move that the capitalist society would make in this country. It perfectly makes sense because then you have to change everything to make something happen and that means people will be buying things that is interesting for sure I haven't had to tackle this problem or anything yet so I really have no idea in the cars that I worked on and back in the day on Toyota mods list or quite different vehicles they don't even make the cars anymore Celica and others. Supra those cars. I had one of the first turbocharged 85 supers in this part of the world back in those days long time ago.
