Alright, my seats were pretty well destroyed so I've been hunting down replacements since I got the car. Finally found some clean, matching seats from a 2007 g35s sedan for $45 a set. Figured worst case I have to do some wiring and adapting.

So I cut the BCM harness off the donor, and want to make a pig tail adapter from the old seat to the new one. I've spent a few days searching for diagrams, only to find they aren't labelled for functionality on the 2007 BCM plug. Cool, figured I'd sit down with my multimeter and some jumper wires and figure out what does what ... No luck. The new seat has memory, I don't need that to work, but it looks like it might be internal, so might as well.

Is there any chance someone can help me figure out what wires do what on this thing. The airbag and either seat belt or heater were plug and play.

 

So you're trying to get the seat motor functions to work right?

 

Yes, I was able to get my hands on a better diagram that shows wire colors and functions, just haven't had time to work on it yet .

I'm told this is for the 2007 seats. Working on finding the one for the 2004 too.

 

You should probably stick to the Factory Service Manual for wiring diagrams, that way you know you're getting the exact correct ones for the vehicle.

https://www.nicoclub.com/infiniti-service-manuals

It looks like you should be able to take the power wire from the body control module and take it directly to the seat harness and splice it, then take the seat ground wire and land it on the ground wire.. Ground wire on the seat harness (4 wire harness) should be black, power wire on the seat harness should be red.

The existing 4 wire harness on your car should be black wire ground, WHITE wire power.

So to verify, the seat has a 4 wire harness, your existing chassis wiring has a 4 wire harness.

Black goes to black on both, existing chassis WHITE goes to seat RED.

If it helps those power wires should be larger gauge of wire. If you can't find a seat RED then look for SKY BLUE, it does go through a sub harness on the diagram. It will also be a larger gauge of wire.

 

So I'm going from the 4 wire harness on the car, simple harness with power, ground, back heater, and seat heater. To the 12(?) Wire harness 9n the 2007 seat. The pictures I posted show the seat with the airbag and seat belt harnesses from the car connected. The 4 wire from the car is not connected. I also have the 12(?) Wire harness from the donor car and the seat. My plan is to wire the 4 wire harness to the 12(?) Wire since I have both ends of both harnesses, to make an adapter between the two.

The issue with the factory manual diagram is the 2007 one doesn't list functionality for any of the wires.

 

They're all listed under their respective sections in SE, it can be a bit confusing at first because they rarely use line diagrams like they used to for the V35 and older chassis cars.

There's no need to rewire the entire seat, the power motors are essentially a self-contained unit that just needs to be given power and ground using the source from your existing 4 wire BCM harness.

Same thing with the heated seats, just splice the wire from the seat heater relay on your existing harness, then take the other side of the circuit to ground on that same existing harness.

The lumbar support is it's own separate circuit that just needs battery power, you don't have an existing circuit for it so I would just tap the same power circuit as the motor power.

Memory for the seat is all stored in the seat computer, it doesn't need to interface with the BCM to function. The memory for seat settings will all reset anytime power is disconnected from the car. The only thing your BCM does is sends power to the seat motor controller, heated seats and lumbar control are separate circuits not handled by the BCM. Nor are they part of the seat memory.

 

Alright I've finally been able to sit down to work on this and I have a little more info, also feel like I took two steps back.

I've been extensively reading the factory manuals and now know I'm working with connector b11. I've figured out the heated seat wires and the lumbar wires, but that's the only places I have seen this connector listed.

I'm not sure where to find the rest of the wires or which one might be the main power. I'm told most of the other wires are various sensors or relays for key detection and memory seats, to tell when the door closes, whose driving, etc.




​​​​​

 

Power seats, harness B10, pin 1 needs power from the BCM. Pin 2 needs ground, this will make all the seat position motors work.

Heated seats, harness B10 ties to the circuit from your existing heater switch, pins 11 and 12, one is the high temp, one is the low temp. You'll just have to experiment which is which and swap the wires if they're wrong. Ground is the same pin 2 OR possibly harness B11 pin 48 depending on whether there was an automatic drive positioner on the car the seats came from. I'm pressure sure it was from a model with the automatic drive positioner since that appears to be the harness you're rewiring.

Lumbar support, harness B11, pin 33 needs power from the battery, pin 48 is ground.

I think where you're getting confused is the wire number, on the line diagram look for the number inside the SQUARE BOX. This is the harness pin number, now reference the harness schedule and look up that pin number and it will tell your the color of the wire and it's position on the harness.

You really shouldn't need to fully break into that harness you're working on. I think it would be much easier to just send power to the harnesses that need it

 

I have the harness from a 4 pin seat and the harness from a 16 pin( b11) car. I want to take power from the 4 pin and connect it to the 16 pin(b11) where it needs power and ground. I'm not looking at the line diagrams for anything. In the picture I drew it clearly shows the connector diagram with the pin numbers.

The issue I'm having is the connector diagrams in the factory service manual only shows the pins for heated seats and lumbar. No mention of main power or what the other large black wire is. I assume most of what I have left is just sensors that I don't need, but what I have shows no mention of power for any movement functions besides lumbar.

 

Ok I think what you're missing is the entire section ADP - Automatic Drive Positioner in the FSM.