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2004 E Class estate 2.2 CDI
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5 Posts
Discussion Starter #1
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!!:eek: 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 :confused: 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?:confused:

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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Registered
2004 E Class estate 2.2 CDI
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5 Posts
Discussion Starter #3
That sounds serious :crybaby2:

I've just had a search and it appears the AAM is expensive?
 

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Registered
1990 190E 2.6,.... 1998 ML320, 2005 ML500SE
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3,103 Posts
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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2004 E Class estate 2.2 CDI
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5 Posts
Discussion Starter #5
Thanks for the information,:thumbsup: 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?:confused:.
Thanks for any help
 

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Registered
1990 190E 2.6,.... 1998 ML320, 2005 ML500SE
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3,103 Posts
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
 

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Registered
1990 190E 2.6,.... 1998 ML320, 2005 ML500SE
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3,103 Posts
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.
 

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2001 ML55
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64 Posts
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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98 C230 Elegance
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6 Posts
Same problem!

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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Dallas, Texas
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7,716 Posts
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-m-class/1553241-heated-seat-problem.html?highlight=seat+heater
 

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Had similar problem. Switch for heated seats would illuminate then flash but seats not working. Found the fuse on the battery pillar to be failed. Replaced and all worked. The fuse is square between two cables on positive term of battery, doesn't look like a fuse at 1st glance. Worth checking.
 

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2001 ML430
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29 Posts
Had similar problem. Switch for heated seats would illuminate then flash but seats not working. Found the fuse on the battery pillar to be failed. Replaced and all worked. The fuse is square between two cables on positive term of battery, doesn't look like a fuse at 1st glance. Worth checking.
Were you hearing the clicks under the seats or nothing? I think if you hear the clink under the seat everything is OK, just the pads are band and you need to replace them...
 

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1999 ML320
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352 Posts
I am now having issues with my drivers side heated seats. The bottom of the driver's seat does not warm. I looked at the connections at the bottom of the seat and I didn't see any loose wires. The lights go on for the heated seats and I hear the click of the relay when I turn on the seats but only the back gets warm. What is a cold bottomed man to do?
 

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Purple Moderator
99 ML430, 00 ML320, 05 E500 4matic Wagon
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22,126 Posts
Had the same problem in mid winter 2008. We both have the same year and just the
heating pad can be purchased from the dealer or an OEM online parts dealer.
I had a local trim shop replace mine. I took the seat out and brought it to them. I did
not want to screw up the leather. The heating element wires failed on the left side of
pad due to wear. New one works like a charm.
 

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2004 E Class estate 2.2 CDI
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5 Posts
Discussion Starter #15
I haven't logged on for a while:eek: and I didn't know anyone had replied after the first few posts so I'd like to thank everone who has responded:D.

Since my original post the symtoms are different and I'll try to explain what I've learned:confused::confused:

When I purchased my ML early in October this year, the heated seats worked a treat and were fine until (I now think?) the weather changed and cooled to freezing degress???

What I now know for sure is if the outside temp is zero and I start my ml and leave it running with the seats on full for 10 or 15 mins, when I get in the seats arent cold? but neither is the car:confused:

After mentioning the seat issue to my girlfriend and on the next rare occassion she was in my car she told me that she could vaguely feel a very slight amount of heat (and the seat was on full for 20 mins). She also said that if she had been wearing jeans, she wouldn't have felt any heat?? However if they didn't work I'm sure she'd have felt the cold!!:eek:

So there you have it? In my 2006 Saab, my heated seats are hot but in my ML you don't notice they are on however you would notice if they were off?:confused:

I'm wondering if I've lost Heat setting 2 but I'm only guessing :confused:

Thank you to everyone :bowdown:
 
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