Author Topic: seat heater wiring diagram  (Read 141 times)

rumb

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seat heater wiring diagram
« on: 05 October 2019, 04:51 PM »
Does anyone have a wiring diagram for the seat heaters? I just pulled the entire wire harness out of the parts car with raueda1 and one green/red (power) wire ended up at at cut end that was laying somewhere in the vicinity of the center console. It had about 10" of tubing on it that was also cut.  Pulling the 2 green/red wires thru the firewall and cutting them out the the enormous harness probably took 2 hours! What a mess the us version with clima wire harness is compared to euro.  There are 2 green/red wires and the other goes to the ignition switch.

Anyone have 2 spare seat heater switches for sale?
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

UTn_boy

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Re: seat heater wiring diagram
« Reply #1 on: 06 October 2019, 02:23 PM »
I didn't look, but is this not in the technical literature section on our web page?  If not how can we add this?  Regardless, below are three pictures.  Descriptions are from TOP to BOTTOM and are as follows. 

The first picture shows the schematic with the switch in the off position.
The second picture shows the schematic with the switch in position •
The third picture shows the schematic with the switch in position ••

I hope this is helpful to you. 
1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex
1978 450sel 6.9 Euro, Anthr/velour

UTn_boy

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Re: seat heater wiring diagram
« Reply #2 on: 06 October 2019, 02:30 PM »
I didn't remember to include the legend. 

1) Fuse terminal 15/15R
2) Push button switch
3) Heating pad, seat bottom
4) Heating pad, backrest
a) Connection terminal 15 or 15R
1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex
1978 450sel 6.9 Euro, Anthr/velour

rumb

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Re: seat heater wiring diagram
« Reply #3 on: 07 October 2019, 03:11 PM »
As best as I can tell, the extra green/red wire is for the radio - at least for the particular car it came out of. It goes thru a line fuse in the fuse box so that makes sense to me.

Unfortunately we removed the wires from the aux fuse box that is mounted on the drivers inner fender just in front of the big fuse box before photographing it.  Despite many attempts I cannot figure out how the 5 wires connect to the little fuse box (2 fuses).  The 5th wire is used to carry the line voltage from one set of terminals to the other.

One of the wires I have just doesnt seem to line up.  Anyone that can take a picture of this little fuse box for me?

'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

UTn_boy

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Re: seat heater wiring diagram
« Reply #4 on: 07 October 2019, 09:49 PM »
Is this what you're asking about?  I've no idea what color the wires are under the sheathing.  I didn't want to damage it. 

1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex
1978 450sel 6.9 Euro, Anthr/velour

rumb

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Re: seat heater wiring diagram
« Reply #5 on: 08 October 2019, 03:00 PM »
Here's the best I could come up with.  The 5th wire loops from one side to power the other. Electrically that seems wrong because then both sets go thru the same fuse, but I cant see any other way to get the power to the other side. The terminal and wire on the lower right is the green/red power wire from the ignition.

« Last Edit: 08 October 2019, 03:08 PM by rumb »
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550