Hi guys,

Recently purchased an r230 that Im delighted with, but it is only kicking out cold air. Also regardless of position of the climate control switches, the air wont come out of the vent under the windscreen. I have run it through a diagnostic machine and tried to clear the faults as well but failed. The following faults remain:

B1451
B1453
B1455
B1456
B1457
B1458
B1560
B1561
B1465
B1466
B1562
B1563
B1057
B1075

All of them show a communication fault.

I thought this could be the climate control unit itself but Im not sure. Anybody have any ideas?

If it helps Im based in West London.

Thanks in advance

 

There is no communication between the control unit and the actuator motors for the various air flaps. My guess is the 5-amp fuse which supplies the motors with power is blown. The fuse is located in the box by the Starter Battery (right-rear engine compartment).

EDIT: power comes from the climate control ECU -- not an external fuse.

 

I found 2, 5 amp fuses in that fuse box next to the battery. Neither was blown.

Do you know which number fuse it should be? I think the top starts at 49 (fan motor) and then drops down to 28 (horn)

 

I misread the electrical schematic. I believe power for those motors comes from the climate control ECU. I would assume that ECU is faulty, but before buying a replacement you might want to check the unit and make sure an electrical connector has not somehow come loose.

 

That is literally the climate control unit itself part number: 2308300785 ??

If so it looks simple enough to change but removing the trim from the middle console. The part looks ridiculously expensive though. I wouldnt have to rip apart the dash though which is something.

Would it need to be coded?

 

Yes, that is correct.

If you install a replacement controller I believe you will need a Star Diagnosis computer to adapt it to the system (the controller learns the positions of the various flap actuator motors.)

 

Thank you.

I have found 2308300185 available at a some what more reasonable price. Would this fit as well? I cant quite figure out the difference between that and the 2308300785 (other than other obvious 7 )

 

Welcome to the forum. If you are unable to clear the fault codes then the diagnostic machine you are using is not a STAR/DAS system. Until you can clear the codes, putting a new control unit in will not change anything. Instruction #5 in the control unit removal says to connect STAR and delete fault memory, (see attachment). I have my car put up for the winter so I can't check but as I recall, I never get heat from the center vents under the windshield, (windscreen) regardless how the dials are set. I may be wrong though. (Of course, the defrosters do put out warm air.)

As to your part number query, part #2308300785 is the latest iteration or progression of the beginning part #2308300185. I can't verify this but see the attached thumbnails from the EPC which I am basing my conclusion on. I have an '03 and used my vin for the search.

Part 2308300185 search in EPC and models affected:



EPC Part number progression:



My advice would be to get the faults cleared correctly and the ones that come back, deal with the troubleshooting and solve the fault code issues before changing out the control unit. I'm guessing the control unit is not at fault.

I am attaching the R&I instructions just in case you do have to do the controller. It's not a big job to remove the console cover. I've done mine twice to re-route communication wires for my phone through the ash tray.

Good luck,

Bob

 

Thanks for your very detailed reply.

a) Correct the machine wasnt STAR. I was able to clear most faults through it but not all of them. Are all STAR/DAS systems hideously expensive to purchase? Or do you guys know of a particular model/variant which will do what I need?

b) Thank you for clearing up the part issue. At least I can find that for a much more reasonable price then the £900 that Mercedes want.

c) Thanks for the instruction manual. Ive seen a couple of youtube videos as well. Seems simple enough.

If there isnt a machine I can use instead of STAR I guess i'll have to find a garage that has one and pay them to use it.

 

You can put a system together for about $300.

What's wrong with the device you are using now?

I have Star Diagnosis. I also have an iCarsoft 980 hand-held device. For reading/erasing codes and viewing live data the iCarsoft is fine and costs $115.

 

To be clear (sorry, just double checking), I could purchase this... and that would be able to read and erase my codes? If it removes the codes it may solve the issue. If not, I should deal with what error codes remain which potentially could be replacing the climate control unit?

The device I was using now is a friends who is a mechanic but its quite universal and couldnt remove these codes but could remove others.

Thanks in advance

 

That is what I have, and it will read and erase codes. But it won't perform the adaptation that I believe a replacement ECU will require, and it does seem you need an ECU. You could confirm that the ECU is the problem by verifying the 3 electrical connectors attached to it are secure, and check its wiring to any one of the flap actuators for which there is a fault.

I presume the inability to erase the various codes is not a failure of the code reader you used. Apparently there is currently no communication between the ECU and the flap actuators it controls, and nothing will erase those codes until communication is somehow restored.

 

OK thank you for your patience and clearing that up. Ill report back if/when it gets fixed or if nothing else works!

 

I am diagnosing AC communication faults on my 2008 SL65.
I have an active B1453-000 communication fault code for the fresh/recirc flap actuator motor and active communication faults between control module N22 and M16/13 for my left defroster flap actuator motor. I have active communication faults with the other flap actuators for all other flap control motors.
When I read the positions, the flap motor position is -10000 steps and the Current flap adjustment travel of the motor is 1515 Steps. The diagnostic tool shows no electrical or mechanical faults.
I recently removed the COMMAND module and had to disconnect the HVAC wire harness when I removed the center console.
Just confirming that based on this thread, I need to find someone with a STAR unit to reset the HVAC system.

 

Come hai risolto?