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      07-17-2019, 07:04 PM   #1
Serf27
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Heated power seat not working when swapped.

Hey everyone, title is a bit weird but wasn’t sure how to title it.

I just did a saddle brown color interior swap on my e90.
The seats I swapped in are heated and the donor car was set up for that so the seats work in that car.
My car did not come with heated seats and now the heated seats I swapped into it are not working.
Well the driver side is working, but the passenger side is not working.
The seat belt dash light also turned on.

Does anyone have an idea what might be happening?
Maybe seat connector harness has to be re-pinned?

The saddle brown wasn’t all that great as I anticipated, so I will switch back over to gray if I can’t get this figured out.
Thanks in advance.
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      07-18-2019, 09:50 AM   #2
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On 4 door E9x, drivers side heat is turned on by the bus by a seat module under the drivers seat. Passenger side heat is turned on by a junction box via a relay under the pass seat. You may need to run 2 new wires. Check the yellow pass side connector under the seat. Pin 1 and 5 are needed to turn on the heat. Also check that all the thick wires line up between your car harness and the new seats.

Your airbag light is on because the car got turned on with the yellow connector disconnected. The buckles are hooked into the airbag system. It can be reset with anything that can reset codes.
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      07-18-2019, 12:06 PM   #3
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Thank you for the reply.

I originally had no power at all to the passenger r seat, no functions.
I repinnss a power wire on my harness clip and now both seats move forwards and backwards and recline
But they have no other functions such as lumbar or bolster action.
I do have the harness connector that came with the heated seats and there are about twice as many wires on it as my current harness.

I was looking at that diagram yesterday and since I am missing half of those wires, I have no idea what to do.
I know I’ll have to add 2 wires for the heated seats somehow, but what about the rest?
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      07-18-2019, 12:44 PM   #4
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You probably are missing 2 thick wires on the drivers side and 2 thick and 2 thin on the passenger side. You have 2 options for the thick wires. Run additional wires to the fuse box or run everything from the current thick power/ground wire. I did this and have not blown a fuse yet. On the seat side of the wiring, connect the thick red wires together. Then connect the thick brown wires together. That will get everything power. Lumbar and side bolsters are on a different fuse.

I used posi taps to connect the thick wires together. https://www.ebay.com/itm/25228518543...m=252285185430
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      07-18-2019, 04:24 PM   #5
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Thanks again for the reply.
Now that you say that, I think I saw you post this on another thread right?!

I will check the cables today.
So if my harness is missing a brown or red wire, just splice into the existing brown/red wire on my harness and pin it to the connector right?

The seatbelt light was on for some odd reason, it went away already.

Did you also install heated seats?
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      07-19-2019, 01:21 AM   #6
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Yes I installed heated/lumbar/power seats into a car that just had power. My car only had one red and brown wire. The seats had 2. I connected the wires together on the back side of the connector so that both got power from the single wire my car came with. I did not re-pin anything other than adding 2 smaller pins for the pass side heat.
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      07-20-2019, 06:06 PM   #7
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Ok I tried adding the second brown and red wire to the harness plug on my car and it still didn’t do anything.
I only tried it on the passenger side, do both seats need it done in order for both to work? Or should it still work even if one isn’t connected yet?

Did you add any extra fuses?
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      07-20-2019, 09:44 PM   #8
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Quote:
Originally Posted by Serf27 View Post
Ok I tried adding the second brown and red wire to the harness plug on my car and it still didn’t do anything.
I only tried it on the passenger side, do both seats need it done in order for both to work? Or should it still work even if one isn’t connected yet?

Did you add any extra fuses?
I am not sure what you did but if the 2nd thick wires are connected correctly, the lumbar will now work. If you ran new wires to the fuse block, new fuses need to be added. I did add a fuse for switched power needed for passenger side heat but that was all.
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      07-20-2019, 11:37 PM   #9
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I will post some pictures to show what wires I have and have added.
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      07-18-2020, 05:11 AM   #10
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Hi I am also having the same problem swapped cloth with power and memory to leather with power memory heat and lumber
Drivers side all works except lumber
Pass side all works except heat
Not sure which small wires go to what or where
Any help please
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      07-18-2020, 01:58 PM   #11
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That’s the exact issue I still have.
I don’t normally carry a passenger so I never looked into the heated wiring on the pass side.
The driver side has heat but no lumbar either.
I still need to look into it.
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      07-18-2020, 03:03 PM   #12
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Quote:
Originally Posted by Serf27 View Post
That’s the exact issue I still have.
I don’t normally carry a passenger so I never looked into the heated wiring on the pass side.
The driver side has heat but no lumbar either.
I still need to look into it.
Have you coded the car with S494 for heated seats? If the cars control units don't know it has heated seats it won't turn them on. You will need to add S494 to the VO then write VO to the CAS and FRM, then code the IHKA and JBE to tell them it has heated seats

You also, depending on what specific model you have, need to install a fuse or fuses to power the passenger seat module. What is the build date of your car?

Last edited by F31B48; 07-18-2020 at 03:15 PM..
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      07-18-2020, 09:25 PM   #13
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Yes I did code the car with the heated seats option.
On the driver side, I moved 1 of the thicker power wires over to an empty pin and the heat worked.
I haven’t messed with the passenger side.
Smass mentioned you can use an electrical plug that will T off power to the additional pins so you don’t have to add a wire from the JBBF and run it to the seat.
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      07-18-2020, 09:53 PM   #14
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Quote:
Originally Posted by Serf27 View Post
Yes I did code the car with the heated seats option.
On the driver side, I moved 1 of the thicker power wires over to an empty pin and the heat worked.
I haven’t messed with the passenger side.
Smass mentioned you can use an electrical plug that will T off power to the additional pins so you don’t have to add a wire from the JBBF and run it to the seat.
The T just allows one thick power wire in your car to feed 2 thick wires that your seat may have. For E90 and E91, the wire from the JBBF and fuse box are still needed for the passenger seat heat to be turned on. Drivers seat heat is turned on by the can bus which any seat with memory has. The passenger seat is turned on with the wire from the JBBF.
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      08-31-2020, 09:14 AM   #15
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Passenger seat heat

Hi I'm having trouble understanding the wire I know how to tap it for power but not sure where to take the 2 small wires to for heat and the purple one it's a 2006 e90
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      08-31-2020, 09:38 PM   #16
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Quote:
Originally Posted by smass View Post
The T just allows one thick power wire in your car to feed 2 thick wires that your seat may have. For E90 and E91, the wire from the JBBF and fuse box are still needed for the passenger seat heat to be turned on. Drivers seat heat is turned on by the can bus which any seat with memory has. The passenger seat is turned on with the wire from the JBBF.
Still haven’t done this.
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      09-01-2020, 05:32 AM   #17
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Jbbf

Hi the small wires for passenger seat heat can they go anywhere else part for the jbbf I don't fancy messing about with that
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      08-05-2022, 03:36 PM   #18
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Where do the wires for the passenger seat go do the heat can work?

Splicing an additional power and negative wire to the car harness connector doesn’t do anything for lumbar support or bolsters.

For the heat, it’s just 2 wires needed to run to the jbbe or fuse box?

Here’s a photo of my car harness and the harness from the diner car.
Left is mine.
Right is donor car and it has extra wires on top.
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Last edited by Serf27; 08-05-2022 at 04:37 PM..
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