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Ask Marty Your Own Question
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53154
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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I need help

Customer Question

I need help
Submitted: 1 year ago.
Category: Mercedes
Expert:  Kevin replied 1 year ago.

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

Customer: replied 1 year ago.
2001 mercedez s500. No power to ac compressor. What feeds power to ac compressor
Customer: replied 1 year ago.
Any answer
Expert:  Kevin replied 1 year 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 ?

Customer: replied 1 year ago.
Ok that will be great. And no codes. Just replaced sc compressor. It went out. Where is this module
Customer: replied 1 year ago.
Ac
Expert:  Kevin replied 1 year ago.

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

Customer: replied 1 year ago.
Ok thanks
Expert:  Marty replied 1 year ago.

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

Customer: replied 1 year ago.
2001 mercedez s500. No power to ac compressor. What feeds power to ac compressor
Customer: replied 1 year ago.
It doesnt have a ac light
Expert:  Marty replied 1 year ago.

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

Customer: replied 1 year ago.
it haves a ec light
Expert:  Marty replied 1 year ago.

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

Customer: replied 1 year ago.
is always on. Even when ac is off
Customer: replied 1 year ago.
It only turns off when i close ignition key
Expert:  Marty replied 1 year ago.

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

Customer: replied 1 year ago.
Inhave a regular obd code reader. Can it be done with this? I tryed disconnecting battery but it doesnt work
Expert:  Marty replied 1 year 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

Customer: replied 1 year ago.
Ok hold ob
Customer: replied 1 year ago.
On
Expert:  Marty replied 1 year ago.

Ok

Customer: replied 1 year ago.
Gave me error 1271
Expert:  Marty replied 1 year ago.

Did you try erasing the code?

Customer: replied 1 year ago.
but is not erasing. Code still there
Expert:  Marty replied 1 year ago.

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

Customer: replied 1 year ago.
It says kla o top of code 1271 den changes to kla v
Customer: replied 1 year ago.
Sorry KLA A TO KLA V but code is the same
Expert:  Marty replied 1 year ago.

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

Customer: replied 1 year ago.
it only does what i told u. Klav a to b
Customer: replied 1 year ago.
I mean v
Expert:  Marty replied 1 year 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?

Customer: replied 1 year 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: replied 1 year ago.
im half way done i guess
Customer: replied 1 year ago.
What is stepper motor control
Customer: replied 1 year ago.
Expert:  Marty replied 1 year 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?

Customer: replied 1 year 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?
Expert:  Marty replied 1 year ago.

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