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Old 03-31-2019, 12:12 AM   #1
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Default Heated Seat Wiring

So I swapped out my 2013 non-heated seats for a pair of 2015 heated seats.

There is a blue wire and brown wire for both seat and back rest.

The person I got the seats from gave me a wiring harness from a pair of Scheel-Mann seats and the harness and switch/relay looks great and should do the trick.

I connected the seats as per my diagram and I had power on low and the light on the switch turned on. When I switched to high, I heard the click and blew both the 15 amp fuse from the harness as well as the 10 amp fuse from the ‘ignition on’ post under the seat. I replaced both and went to try the passenger side harness as I haven’t connected it to a seat yet and nothing lights up or turns on. I’ll assume I fried both relays in the switch harness.

I know there are two wires entering from the harness to seat and from harness to backrest. Perhaps i'm using the ground/brown wire incorrectly. Perhaps the brown is part of the circuit and not to be grounded? Maybe I should just take the black from the switch and ground to chassis again. Then connect the 4 wires from the seat to the remaining 4 wires from the switch and relay.

Any suggestions from wiring gurus out there? I spoke to two red seal electricians here and neither had any clue. Mind you they deal with more commercial endeavours.

Cheers!
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Last edited by smurph; 03-31-2019 at 12:28 AM.
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Old 03-31-2019, 12:51 AM   #2
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Default Re: Heated Seat Wiring

The way the high/low heat system usually works is to hook up the seats in parallel for "high", and series for "low".

I'll have to dig up which relay terminal does what, but the way you have your "as i wired it" drawn, you can't get there from here.
(that sideways black U-shaped wire between the two red wire prevents it)

Gimme a bit...

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 03-31-2019, 12:56 AM   #3
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Default Re: Heated Seat Wiring

Quote:
Originally Posted by autostaretx View Post
The way the high/low heat system usually works is to hook up the seats in parallel for "high", and series for "low".

I'll have to dig up which relay terminal does what, but the way you have your "as i wired it" drawn, you can't get there from here.
(that sideways black U-shaped wire between the two red wire prevents it)

Gimme a bit...

--dick

Thank you Dick! I am in your debt. That loop wire is one of the reasons i've held off so long doing this install. It was there from Scheel-Mann but it seems like a reason for it to trip - hot/hot.

Next time i'm in Seattle - we're going for dinner!
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Old 03-31-2019, 01:10 AM   #4
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Default Re: Heated Seat Wiring

The REAL problem appears to be that you have the relay short-circuiting + to - .
When 86/85 is powered up, 30 connects to 87 ... Zap!

Gimme a bit longer (since i haven't followed the rest of the "logic"...)
(added a few seconds later ... no, that ain't it... )((maybe))

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 03-31-2019, 01:12 AM   #5
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Default Re: Heated Seat Wiring

Sounds good. I have no idea why they wired it that way. Thatís how they were in the package.

Thanks again.
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Old 03-31-2019, 01:55 AM   #6
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Default Re: Heated Seat Wiring

As far as i can tell (since i have no solid idea what the switch contacts are), this appears to be what you have:

HotSeatCirc1.png

What you want will take longer to draw, and may not be achievable with what you've got
(maybe).

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 03-31-2019, 02:22 AM   #7
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Default Re: Heated Seat Wiring

Here's how MB does it ... they use a double pole, double throw (center off) switch:

HotSeatMB.png

No relay is involved (there's one supplying the power feed, but it's independent of seat switching)

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))

Last edited by autostaretx; 03-31-2019 at 02:25 AM.
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Old 03-31-2019, 02:40 AM   #8
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Default Re: Heated Seat Wiring

Thanks for taking the time to write that out. Much appreciated.

I removed the seat. I cut that loop wire. The switch works - supplying power when on low and on high to the two different wires. I'll play with the seat wiring tomorrow and see what happens (without the loop). I have lots of spare fuses :).
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Old 03-31-2019, 02:51 AM   #9
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Default Re: Heated Seat Wiring

Here's how it should be built:

HotSeatCirc2.png

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 03-31-2019, 02:54 AM   #10
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Default Re: Heated Seat Wiring

Quote:
Originally Posted by autostaretx View Post
Here's how it should be built:

Attachment 110235

--dick
Excellent! Thank you! I'll give it a whirl. I love these forums.

If you ever need an answer regarding anything house or motorcycle related, don't hesitate to call!
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