Mercedes-Benz Forum banner

1 - 11 of 11 Posts

·
Registered
1999 ML320; 2003 S500 4Matic; 2004 ML500; 2008 ML350
Joined
·
168 Posts
Discussion Starter #1
Hey guys.

As some of you know I'm in college and don't have my dear ML with me since there is no need to have it in Philadelphia. Anyways, I get a phone call from my mother, telling me my car now has some problems:

1. The heated seats don't work. The lights on the dash will light up, but the seats don't heat up.

2. The lift gate won't lock by the key fob or the central locking system button on the console. It will only lock by hand. Also, the rear dome light doesn't respond to the lift gate being open. The rest of the car can be locked by the fob and button on the console, just not the tail gate.

I'm kind of stumped. I hope nothing it terribly wrong.
Thanks for the help,
SAM
 

·
Registered
99 White ML320, 13 Audi S5,84 300ZX Turbo, 03 Audi A4, 03 Audi TT, 65 Ford Galaxie Conv
Joined
·
474 Posts
Not sure about the heated seats, but it sounds like the plunger switch that tells the car the rear hatch is closed is broken since both your light and the lock don't work. I assume you have tried to manually turn the light on with the switch in the ceiling and that the siwtch is in the proper position to turn on when the door is open when you say the light will not light up.

Other than that, another common problem is in the attached link. Lot's of pictures.

http://www.benzworld.org/forums/w163-m-class/1125062-hatch-door-actuator-plastic-stuff-warning.html
 

·
Registered
1999 ML320; 2003 S500 4Matic; 2004 ML500; 2008 ML350
Joined
·
168 Posts
Discussion Starter #3
I should have mentioned that. Yes, the light is switched in it's proper place. But, I will double check that when I go home tonight for Thanksgiving Break.
Do you perchance know the part number for the actuator and possibly the "Christmas tree" clips (in case I break a few)?
 

·
Registered
ML320 2002
Joined
·
1,602 Posts
Sam, start troubleshooting by checking the fuse for the seat heater (F28) it's inside the black box within the engine compartment. What did you mean by "lights on the dash will light up"?
 

·
Registered
1999 ML320; 2003 S500 4Matic; 2004 ML500; 2008 ML350
Joined
·
168 Posts
Discussion Starter #5
I will definitely check the fuse when I get home tonight. The little lights on the seat heater button on the dash light up. One for the regular heat and two for the rapid heat. They both light up as they should, but the seats don't get warm.
 

·
Registered
1990 190E 2.6,.... 1998 ML320, 2005 ML500SE
Joined
·
3,103 Posts
It's unusual for both the seat bottom and back heaters to fail at the same time. If both are not working when set to High Heat position (2 lights on the switch) I would first suspect the fuse than I would check under the set to see if the heater plugs became un-plugged. It happens from time to time if someone placed something under the seat.
FYI, the way the heaters work is both the seat bottom and back are connected in parallel for high heat and the relays reconnect the heaters in series for low heat. In high heat if one of the heaters is defective the other will still continue to work. In low heat if any one of the heaters is defective (open circuit) neither seat heater will work.
Good luck in trouble shooting your ML.
Mike
 

·
Registered
1999 ML320; 2003 S500 4Matic; 2004 ML500; 2008 ML350
Joined
·
168 Posts
Discussion Starter #7
So from what I've heard from my mom, neither the high nor low heat work in both the driver and passenger seat. It might sound like a fuse to me.
On the other hand, what does the heat plug look like? Which one is it?
 

·
Registered
1990 190E 2.6,.... 1998 ML320, 2005 ML500SE
Joined
·
3,103 Posts
So from what I've heard from my mom, neither the high nor low heat work in both the driver and passenger seat. It might sound like a fuse to me.
On the other hand, what does the heat plug look like? Which one is it?
From what you just described it is most likely the fuse. There are two small plugs under each seat. They have two wires each. They are plugged up into the bottom of the seat and if they are the problem they will be the ones hanging down and not connected.
Mike
 

·
Registered
1999 ML320; 2003 S500 4Matic; 2004 ML500; 2008 ML350
Joined
·
168 Posts
Discussion Starter #9
If I remember correctly, the heated seat wires are the only ones that go into the bottom of the seat? Anyways, if they are disconnected it will be noticeable for sure.

I know where the fuse box is, but I'm not overall familiarly with it. I know I'm looking for Fuse F28, but what exactly am I looking for?
Thanks
SAM
 

·
Registered
1999 ML320; 2003 S500 4Matic; 2004 ML500; 2008 ML350
Joined
·
168 Posts
Discussion Starter #11
Alright, I will give it a check. Another rookie question, what's the light test regarding fuses that I've read about? I couldn't find a definition nor explanation for it.
 
1 - 11 of 11 Posts
Top