Both Heated Seats not working ?? - Mercedes-Benz Forum

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Old 11-26-2010, 06:16 AM   #1 (permalink)
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Date registered: Oct 2010
Vehicle: ML270 Late 2001 FaceLift
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Exclamation Both Heated Seats not working ??

I have spent quite a lot of time looking within this forum but I've found no solution?

So, at the beginning of the week whilst driving I thought I smelled burning!! It was brief and I thought it was an outside smell and I didn't think of again.

A few days later I began to suspect my heated seats because the weather has just cooled quite considerably and, well, I've just sort of noticed I'm now quite sure they are defunct?

I've checked the fuse F6 and the switch lights work but no heat on both seats?

I'm not so sure my seat has burnt out because the passenger seat is inop as well?

Would appreciate any help with this as the bloody winter has arrived and this is my first diesel ML and it takes forever to warm up

Many thanks
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Old 11-26-2010, 06:38 AM   #2 (permalink)
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Im pretty sure ive seen AAM defect...
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Old 11-26-2010, 07:02 AM   #3 (permalink)
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That sounds serious

I've just had a search and it appears the AAM is expensive?
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Old 11-26-2010, 07:31 AM   #4 (permalink)
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I wouldn't panic and jump on the AAM too soon. If you hear relay's clicking underneath your seats when you activate the up and down seat heater switches than most likely the AAM is good. If you don't hear the relays clicking that still doesn't necessarily mean the AAM is bad. Look underneath both seats and make sure all the various plugs are plugged in all the way.
Mike
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Old 11-29-2010, 05:41 AM   #5 (permalink)
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Thanks for the information, I can confirm that I can in fact hear the rely noise when switching the seats on and off and high and low setting on both front seats
Any other things I can check or possible things it could be?.
Thanks for any help
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Old 11-29-2010, 05:57 AM   #6 (permalink)
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That means that your AAM is good. I'll bet you like that news. Either all 4 seat elements are bad, which I doubt. They are unplugged. The fuse is bad. Somewhere the main power from the fuse panel to the seats is either unplugged or broken. All 4 relays are operating but all the contacts on the relays are bad, again which I doubt. There is not much else.
Mike

Last edited by Mike's ML; 11-29-2010 at 06:02 AM.
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Old 11-29-2010, 03:13 PM   #7 (permalink)
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I have checked the seat heating wiring further and found that the +12v for the relays is the same 12v supply for the seat heaters therefore your fuse and power going to the seats must be good if the relays are clicking on and off. The problem must be from the relays under the seats to the seat heaters themselves.
Please let us know what you ultimately find.
Mike

[EDIT] and don't forget to check the grounds (earth) for the seat heaters, usually a brown wire. The ground for the heaters is different than the ground to operate the relays. The relay ground is switched by the AAM.

Last edited by Mike's ML; 11-30-2010 at 05:58 AM. Reason: Added "check for ground" comment
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Old 11-30-2010, 02:31 AM   #8 (permalink)
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you could check the resistance of your heater element. Pray its not OL because they comes with leather covering and its about 1500$ for both...AAM aint that expensive :P
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Old 12-28-2010, 09:52 AM   #9 (permalink)
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Same problem!

Quote:
Originally Posted by Mike's ML View Post
I have checked the seat heating wiring further and found that the +12v for the relays is the same 12v supply for the seat heaters therefore your fuse and power going to the seats must be good if the relays are clicking on and off. The problem must be from the relays under the seats to the seat heaters themselves.
Please let us know what you ultimately find.
Mike

[EDIT] and don't forget to check the grounds (earth) for the seat heaters, usually a brown wire. The ground for the heaters is different than the ground to operate the relays. The relay ground is switched by the AAM.
Hey guys, I am having the same problem with my seats... I hear the clicking... I have power to the plug where it enters the heat pad as well

How would I test the ground (brown wire) on the heat pad itself?
BTW I took the passenger seat apart and removed the pad with the Airbag sensor on the bottom of the seat hoping to see a problem along the way, but with no luck!

Well TIA
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Old 12-28-2010, 10:03 AM   #10 (permalink)
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Quote:
Originally Posted by fantasticus View Post
Hey guys, I am having the same problem with my seats... I hear the clicking... I have power to the plug where it enters the heat pad as well

How would I test the ground (brown wire) on the heat pad itself?
BTW I took the passenger seat apart and removed the pad with the Airbag sensor on the bottom of the seat hoping to see a problem along the way, but with no luck!

Well TIA
You can check heating element resistance. 5-10 ohms.

http://www.benzworld.org/forums/w163...ht=seat+heater
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