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Old 02-19-2013, 06:59 AM
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Join Date: Feb 2013
Posts: 2
PLEASE HELP - 1999 C230 - Climate Control Issue - Bad Switch?

The climate control on my 1999 C230 has stopped working. Manual dial system not the digital display.

It happened after I replaced the windshield wiper motor (due to ice holding wiper and plastic gear inside motor was stripped). Not sure if this is related or just a coincidence.

The blower runs when power is connected to it directly OR when the REST button is depressed (red light on). This is the way I am getting heat right now, until I figure this out.

When the REST button is engaged the switches illuminate, when the REST button is off the switch lights are off.

I have constant power to the Blower Regulator and power at the blue wire and red wire connected to the regulator.

When I connect a test light to a ground and touch the body of the Regulator the test light goes on? Is this normal?

I have tried another regulator and get the same thing.

Is there a way to figure out if the climate control switch module is bad?

The EC button does not illuminate when pressed, but the heat was working fine anyway until 2 days ago.

I have taken it out and inspected it but everything (circuit boards) look ok, no smell, clean, etc...

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Old 02-20-2013, 08:35 PM
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Join Date: Feb 2013
Posts: 2
Bad Resistor - Anybody here?

anyone home?
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Old 02-21-2013, 04:25 PM
whunter's Avatar
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,380

This is a ground control circuit = all control is on the ground side.

Best guess:

You lost the ground connection or the blower regulator failed.


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