Question about 2000 Mercedes-Benz S-Class

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2000 s500 air con does not have power not the sam unit all fuses and relays are ok is there any hidden fuses when power is given from an outside source it works

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  • malimo Jun 21, 2011

    there is no wiring problem we have four of these vehicles and have tried new sam unit and climate control unit but still no power to the wire that supplies the compressor on the right hand side fuse box is there anything else it could be

  • malimo Jun 21, 2011

    w220 s500 no power to aircon compressor not sam unit or climate control unit it works when you put power from outside source

  • malimo Jun 21, 2011

    no good as stated all fuses are ok changed sam unit from working car and climate control unit and still no power to air con

  • malimo Jun 21, 2011

    malimo@bigpond.com

  • malimo Jun 22, 2011
  • malimo Jun 22, 2011

    the only code comming from the climate control is 1269

  • malimo Jun 22, 2011

    and as I stated the power for the compressor should be live whether it is on or not when engine is turned running it is not any of the sensors causing it for some reason the power to that particular wire is not live when engine is on.

  • malimo Jun 22, 2011

    which relay is it

  • malimo Jun 22, 2011

    it is not a fuse problem all fuses are ok fault code 1269 can that cause the power not to be present and where can it be located.

  • malimo Jun 23, 2011

    it cannot be that because when power is given from an outside source to the wire in fuse box 1 for the compressor it works

  • malimo Jun 23, 2011

    2000 S500 the power wire from sam unit for air con compressor should be live when engine on tested new sam unit still no good when powered from outside source the compressor works all fuses are ok and the only code I can see is 1269 which was there when it was operating perfectly

  • malimo Jun 23, 2011

    I am sorry the compressor works perfectly the problem is not the compressor it is the power coming to it the wire which supplies the compressor it is the green blue wire which plugs into the sam unit whic is next to the smallest relay the power should be on when car is running but is not. when I supply power to that wire from an outside source the compressor works perfectly.

  • malimo Jun 23, 2011

    yes there is no power from the sam unit where that wire plugs into we have tried a working sam unit but still the same

  • Cheryl Woods
    Cheryl Woods Mar 01, 2016

    I'm having the same problem did you find the issue

  • Cheryl Woods
    Cheryl Woods Mar 01, 2016

    I'm having the same problem did you find the issue

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7 Answers

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  • Master
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1. In the fuse box no.# 1 placed in the engine compartment:
Check fuse no.# 23 - F23 (10A) = Air Conditioning Control Unit.

2000 s500 air con does not have power not the sam - tdisline_667.jpg

Posted on Jun 22, 2011

  • TDISLine
    TDISLine Jun 22, 2011

    Air Conditioning DTC fault code 1269:

    AIRCO B1269 CAN communication error with the KLA multifunction sensor.


    Check the evaporator temperature sensor. It's possible that the B1269 could mean that the A/C is not running with only the ignition on position and the engine not running.

    The multifunction sensor is there to get the ambient humidity, and pollution levels. It's mounted in the cabin air intake under the bonnet.

  • TDISLine
    TDISLine Jun 22, 2011

    B1269 Communication fault of A/C bus with control - unit B31/1 (AAC multi function sensor)

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I have a 2000s500 I was put in a aftermarket radio and I loss all power now my heart and air conditioning systems no power alarm not working and now my cooling fan tuning high please help me

Posted on Oct 29, 2015

  • willie Oct 29, 2015

    Can u email me back please

  • Cheryl Woods
    Cheryl Woods Mar 01, 2016

    I'm having the same issue.... Did you figure it out?

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  • Master
  • 1,386 Answers

Hello and welcome to FixYa!

Have you tried swapping the computer from a working car yet? You may want to try that. We may have a computer failure that's why it's not giving power. Please keep me posted on the progress.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Jun 23, 2011

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  • Master
  • 3,530 Answers

Welcome to Fixya

Test the aircon compressor first. Rotate the compressor pulley. Use your hand to turn the pulley one complete cycle. If the pulley will not turn, the bearings are bad and must be replaced.

Use a multimeter to test the AC coil. Put the red node of the multimeter on the positive terminal of the coil and touch the black node anywhere on the car body. Check to see if electric current is present in the coil. Inspect the A/C clutch. It is a lever that is used to engage and disengage the air conditioning. Hold the clutch and see if it will move back and forth. If the clutch will not move, the compressor shaft has seized, and the whole compressor must be replaced.
Thank you for using Fixya!

If you need further help, reach me via phone at https://www.6ya.com/expert/elixirjose_00375ea24bd8141b

Posted on Jun 23, 2011

  • Jose Cada
    Jose Cada Jun 23, 2011

    Have you tried testing the wire using a tester to see if there is current flowing to the wire? If there is no current, then the problem is there might be a cut or short from that wire.

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  • Master
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Inline to the wiring to the compressor is a fusable link which is incorporated with the wiring near the compressors plug in connector. If shorted out the wire will pull in two or stretched if pulled very hard.

Posted on Jun 23, 2011

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  • Master
  • 1,702 Answers

There are 5 power sources for the front A/C unit each power source power up different aspects of the system and there are 2 power sources for the rear A/C unit.

front unit

fuse # 23 ( 10 amp ) left fuse box ( under hood )

fuse # 33 ( 60 amp ) right fuse box ( under hood )

fuse # 35 ( 40 amp ) right fuse box 9 under hood )

fuse # 48 ( 7.5 amp ) right fuse box ( under hood )

fuse # 47 ( 10 amp ) right fuse box ( under hood )



rear A/C unit

fuse # 68 ( 15 amp ) trunk fuse box

fuse # 69 ( 15 amp ) trunk fuse box

let me know if there is any thing else you need.

Posted on Jun 21, 2011

  • 2 more comments 
  • john nail
    john nail Jun 21, 2011

    send e-mail and i will send you the wiring diagram for the A/C system, then you can have something to work from wile you test the system

  • john nail
    john nail Jun 22, 2011

    stuff is on the way, please let me know when you get it.

  • john nail
    john nail Jun 22, 2011

    you have to understand that there are many sensors that have to be in range before the A/C module can turn on the compresser. when you turn on the A/C switch it sends a signal to the on-board computer system, the on-board computer then looks at all the sensors like engine temp, rpm, tps, evap. temp, A/c pressure..and many more if all the sensors are in range then the computer turns on the compresser, if any of these sensors are out of range the computer will not turn on the compresser, so with all that said you need to test the computer system for troble codes all codes PCM, BCM, HVAC all these systems need to be checked. and by the way you can not take a computer from one car and put it in another car each computer is programed with the cars vin if you swap the computers from car to car with out reprograming them they just will not comouencate with each other. you need to get a scanner and get the info from the computers, if the A?C is coming on the computer knows why you just need to ask it it has all the info from all the sensors and will tell you why it will not turn on the system......good luck

  • john nail
    john nail Jun 22, 2011

    the relay that powers the compresser is still controled by the on-board computer system.

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  • Mercedes-Benz Master
  • 11,800 Answers

No, no other hidden fuses. The air con is controlled directly by the BCM, which includes the entire climate controls. If you compressor and the fan works when powered directly then the defect is in the BCM or the wiring between it and the compressor - to determine which you will need to have the error codes read.
If no error codes are detected then it's a wiring failure - the entire harness, starting from the BCM inside the dash, will have to be inspected and repaired. This is going to be a very large and fiddly job, that will require extensive dismantling of the dash , it will take at least a day to do it.

Posted on Jun 21, 2011

  • Azrael SRL Jun 21, 2011

    No, there is nothing else, of course apart pairing the modules with the car that must be done after every part replacement - but i assumed you have done that

  • Azrael SRL Jun 23, 2011

    P1269 - Immobilizer Code Not Programmed - nothing to do with your problem. As i said it's either the wiring - you have a break in it - or the controller isn't functioning - either you have a defective one or it hasn't been paired to the car.

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