Hello,

I have a 2000 ML 320. The heater and vents lights to show the fan speed ect is not comming on when the head lights come on. All the other dash lights seem to come on the radio, speedo, control switch for the windods ect seem to be working except for the heater and vents lights.

I have one of the older ML that have the older style fan speed and temp control. Is the lights a simple system (old fashing mini light buld connect to the dash light electrocal system) or is it connected to some computer that can be set or reset?

What could be wrong? Where should I start to look for the problem?

I have disconnected the battery recently. Because the ets and esp light is comming but I replaced the famous break switch seem to fixed it. Could I have disconnected some when I am changing the switch.

Will disconnecting the battery again reset it. I don't want to disconnect the battery again if I have no chance in fixing the heater light problem.

thanks

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Silver Honda Accord, 2006
Silver G500, 2003
Silver SLK-320, 2002
Black ML-320, 2000
Bule Porsche 993 Targa , 1997
Silver Merkur XR4Ti, 1987

The a/c controller has bulbs behind the control knobs. Just pull them off & there are the bulbs

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Do you mean just pull the knobs out and the bulbs will be behind them.

Also I have no light on all of the 3 of the knobs. I there are multiple light bulbs it would be strange to have all of the go out. If it is not the bulb is there another area I can look?

thanks

__________________
Silver Honda Accord, 2006
Silver G500, 2003
Silver SLK-320, 2002
Black ML-320, 2000
Bule Porsche 993 Targa , 1997
Silver Merkur XR4Ti, 1987

Just pull off the knobs & you will see.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

I believe only the center knob needs to be pulled. One bulb illuminates all three knobs.

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98 ML320 (gone but not forgotten)