Brian_S550
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- Mar 1, 2018
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- Chicago suburbs, IL
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- Vehicle(s)
- 2015 Mustang 3.7L, 2016 Explorer 3.5L
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After a lot of research and testing, my friend and I have just finished installing dual power-adjustable leather seats from a GT Premium donor into my 2015 Mustang V6 Coupe- which started life as a package 050 without even a power driverβs seat. As we discovered, there is essentially a factory pre-wired solution for the problem of getting the necessary 12V power supplied to the seat switch and motors in a car that wasnβt originally equipped with them.
These are the plugs that youβll find underneath each front seat. The two outermost pins are 12V power and Ground for power seat control (Green/Red and Black on one side, Gray/Red and Black/White on the other). Base trim S550βs, and most likely any Premium cars that came with Recaro seats, do not have this corresponding wiring in the door sill junction plug (light gray wiring connectors hidden behind your kick panels on both sides) that would lead from the BJB/fusebox under the hood and back through the firewall.
Those two empty spots next to the pink 30 Amp fuse is where a Premium car has the fuse circuits for a power driver and passenger seat. As you can see, there arenβt the necessary two pins for each fuse location allowing us to simply install a fuse and let power seats be hooked up. Thanks, Ford...
However, the two blue 20A fuses in the next row are actually the key to making these retrofitted power seats functional. There are a pair of unused wires in the light gray connectors I mentioned earlier. One side of the car has a White/Red wire, while the other side is solid Red. They are both 2-3 pins away from where the 12V power would be supplied on a car with factory power seats.
So first we need to replace those two 20A fuses found in the BJB with 30A types, and then de-pin and move the previously mentioned White/Red and Red wires over so they will match up with the Green/Red and Gray/Red seat power wires coming out of the same joined plugs.
Hereβs why this is an easy retrofit- there are apparently two constant 12V power circuits on S550 models that correspond to left and right side motors that would operate a convertible top. These wires are present in Fastback coupes, too, and are left completely unused even though they have 20A fuses already installed in your BJB under the hood. My original theory was that weβd have to figure out a way to connect and run new wires from Fuses 12 and 13, when in reality the simplest solution was to repurpose Fuses 15 and 17... since there isnβt much need currently for powering a convertible top in my fastback.
If you guys have further questions about how I got the new seats operating in my base car, I will be happy to answer with as much additional detail as you want. But I wanted to share this easy fix for those of you who might be interested in adding power seats to an S550 which doesnβt currently have that feature. In all, it took less than 20 minutes to prepare my car for the new seat installation, and the only cost involved was approximately $5 for new 30A fuses (I found a multi-pack on Amazon) to successfully activate them.
These are the plugs that youβll find underneath each front seat. The two outermost pins are 12V power and Ground for power seat control (Green/Red and Black on one side, Gray/Red and Black/White on the other). Base trim S550βs, and most likely any Premium cars that came with Recaro seats, do not have this corresponding wiring in the door sill junction plug (light gray wiring connectors hidden behind your kick panels on both sides) that would lead from the BJB/fusebox under the hood and back through the firewall.
Those two empty spots next to the pink 30 Amp fuse is where a Premium car has the fuse circuits for a power driver and passenger seat. As you can see, there arenβt the necessary two pins for each fuse location allowing us to simply install a fuse and let power seats be hooked up. Thanks, Ford...
However, the two blue 20A fuses in the next row are actually the key to making these retrofitted power seats functional. There are a pair of unused wires in the light gray connectors I mentioned earlier. One side of the car has a White/Red wire, while the other side is solid Red. They are both 2-3 pins away from where the 12V power would be supplied on a car with factory power seats.
So first we need to replace those two 20A fuses found in the BJB with 30A types, and then de-pin and move the previously mentioned White/Red and Red wires over so they will match up with the Green/Red and Gray/Red seat power wires coming out of the same joined plugs.
Hereβs why this is an easy retrofit- there are apparently two constant 12V power circuits on S550 models that correspond to left and right side motors that would operate a convertible top. These wires are present in Fastback coupes, too, and are left completely unused even though they have 20A fuses already installed in your BJB under the hood. My original theory was that weβd have to figure out a way to connect and run new wires from Fuses 12 and 13, when in reality the simplest solution was to repurpose Fuses 15 and 17... since there isnβt much need currently for powering a convertible top in my fastback.
If you guys have further questions about how I got the new seats operating in my base car, I will be happy to answer with as much additional detail as you want. But I wanted to share this easy fix for those of you who might be interested in adding power seats to an S550 which doesnβt currently have that feature. In all, it took less than 20 minutes to prepare my car for the new seat installation, and the only cost involved was approximately $5 for new 30A fuses (I found a multi-pack on Amazon) to successfully activate them.
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