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Submitted: 2 years ago.Category: Mercedes
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11/15/2015
Mercedes Mechanic: Kevin, Master tech replied 2 years ago
Kevin
Kevin, Master tech
Category: Mercedes
Satisfied Customers: 2,433
Experience: Diagnostic technician
Verified

Hi im kevin what car do you have and how can we help ?

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Customer reply replied 2 years ago
2001 mercedez s500. No power to ac compressor. What feeds power to ac compressor
Mercedes Mechanic: Kevin, Master tech replied 2 years ago

Ok i can give wiring diagram if that helps power comes from multifunction module have you any fault codes within system ? Has gas been low ?

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Customer reply replied 2 years ago
Ok that will be great. And no codes. Just replaced sc compressor. It went out. Where is this module
Customer reply replied 2 years ago
Ac
Mercedes Mechanic: Kevin, Master tech replied 2 years ago

My info is limitd il opt out i have no co ponent locations another tech will help shortly

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Customer reply replied 2 years ago
Ok thanks
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 54,524
Experience: Bosch Certified Master Tech. Over 35 years experience.
Verified

Hi, perhaps I can help. My name is***** the red light in the A/C off button on?

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Customer reply replied 2 years ago
2001 mercedez s500. No power to ac compressor. What feeds power to ac compressor
Customer reply replied 2 years ago
It doesnt have a ac light
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

The left front SAM powers the compressor. Does it have an EC light?

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Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

Ok, when the system is turned on does the red light in the EC button remain on?

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Customer reply replied 2 years ago
is always on. Even when ac is off
Customer reply replied 2 years ago
It only turns off when i close ignition key
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

Ok, then there is a fault code stored in the climate control panel. Have you tried erasing the codes in the climate control?

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Customer reply replied 2 years ago
Inhave a regular obd code reader. Can it be done with this? I tryed disconnecting battery but it doesnt work
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

No you have to erase the codes in the climate control unit itself. I made a video of the procedure. Click on the link below. Once you erase the codes the compressor should turn on. Let me know if it works.

https://www.youtube.com/watch?v=tPPenpU8zHU

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Customer reply replied 2 years ago
Ok hold ob
Customer reply replied 2 years ago
On
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

Ok

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Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

Did you try erasing the code?

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Customer reply replied 2 years ago
but is not erasing. Code still there
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

Is that the only fault code? Did you scroll through using the right side temperature button to check for other codes?

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Customer reply replied 2 years ago
It says kla o top of code 1271 den changes to kla v
Customer reply replied 2 years ago
Sorry KLA A TO KLA V but code is the same
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

Did you use the right side temperature button to check for other codes?

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Customer reply replied 2 years ago
it only does what i told u. Klav a to b
Customer reply replied 2 years ago
I mean v
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

The fault code indicates a problem with the communication to the stepper motor control module. What is the history of the a/c compressor problem?

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Customer reply replied 2 years ago
No power to ac so it wouldn't turn on. When i put power it would engage but wouldnt cool. I put in new ac compressor, still no power but when i put power it cools ice cold.
Customer reply replied 2 years ago
im half way done i guess
Customer reply replied 2 years ago
What is stepper motor control
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

The stepper motor control module is for the motors that control the vent flaps. I can't see it causing the problem with the compressor. After going through the procedure to erase the codes does the EC light still remain on? Are you unable to press the EC button to turn the light off?

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Customer reply replied 2 years ago
No, now i can turn it on and off. Light goes on and off. I had check all fuses before doing reset, should i check them again?
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

I'd definitely check all of the fuses but if the EC light turns off you should be getting power to the compressor.

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Marty
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 54,524
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Experience: Bosch Certified Master Tech. Over 35 years experience.

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