Electrical For discussions regarding wiring up electrical modifications such as radar detectors, brake light mods, power sockets, and driving lights in Clubman (R55), Cooper and Cooper S (R56), and Cabrio (R57) MINIs.

R56 - A/C Compressor Relay

  #26  
Old 08-13-2015, 01:00 AM
avarath
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Lex2008, the pictures you posted... Is that easily accessible? And if so? where might I look? I don't want to endure another hot Texas summer. I was told I needed my junction box replaced but I only started having issues after I took it to that same shop that later diagnosed the issue for me.
 
  #27  
Old 08-13-2015, 08:39 AM
Lex2008
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Originally Posted by avarath View Post
Lex2008, the pictures you posted... Is that easily accessible? And if so? where might I look? I don't want to endure another hot Texas summer. I was told I needed my junction box replaced but I only started having issues after I took it to that same shop that later diagnosed the issue for me.
You got it my bro. Its RIGHT THERE. Just get under the front passenger side of the engine. You will want to remove the triangular splash shield that has 3 screws holding it in place just to have more space to get your hands on the connector but you can see it with the shield in place no problem.

The yellow and black connector sits on a metal bracket attached to the AC compressor. Take it off and then move it around and see if the compressor clutch engages and disengages. (make sure the AC button is ON in the car).

Check that yellow connection before you spend money on the junction box.
 

Last edited by Lex2008; 08-13-2015 at 08:53 AM.
  #28  
Old 08-29-2017, 09:42 AM
ssashton
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I'm having some issues with my AC. I just had it re-gassed at the shop and it is holding tight, but the compressor will not engage. I checked the AC computer and there are no reported errors.

I can read the AC compressor status with the diagnostic tool. It always shows 'AC Compressor not operating'. When I press the AC button the status on shown on the diagnostic tool changes to 'ac-compressor operating' but only while I hold the button. As soon as I release the AC button it returns back to 'not operating'. At no point does the compressor engage.

I've checked the connector at the compressor and there is no voltage on the plug. If I use a battery I can force the AC compressor clutch to kick on, so I know the clutch is okay, if it receives a signal.

Can anybody point me to a wiring diagram for the AC system? I want to know where the wire feeding the AC compressor clutch goes. At this point I've no idea if the wire is broken or the relay is broken or anything else. Does the wire trace directly back to the relay box in the kick panel? If so, which plug and pins?

Thanks so much for any tips!
 
  #29  
Old 08-29-2017, 09:54 AM
Lex2008
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what year is your R56? S or not?

So far your diagnosis is great. Youve narrowed it down to the simply and cheap issues it seems.

Did you pull the relay and check it? That's super easy to do. Just google a video. You should be able to hear it click when you press the AC button.
 
  #30  
Old 08-29-2017, 10:02 AM
Lex2008
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I found this (mine is a 2008 cooper S R56): Check this connector.


 
  #31  
Old 08-29-2017, 10:05 AM
Lex2008
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Here is the relay location for the clutch. Not sure why it lists so many clutch relays on that panel.


 
  #32  
Old 08-29-2017, 10:14 AM
Lex2008
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Here is a diagram...for the gas engine, in two halves:




 
  #33  
Old 08-29-2017, 10:17 AM
Lex2008
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The AC pressure switch should be checked as well.

Im sorry but I cannot find the resistance values for checking that switch's proper operation.


 

Last edited by Lex2008; 08-29-2017 at 10:48 AM.
  #34  
Old 08-29-2017, 10:27 AM
ssashton
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Originally Posted by Lex2008 View Post
Did you pull the relay and check it? That's super easy to do. Just google a video. You should be able to hear it click when you press the AC button.
Oh wow, thanks for so much help!!
It is a 2007 Cooper S.

I will read all your info tonight. Just want to say thanks now.
 
  #35  
Old 08-29-2017, 10:33 AM
Lex2008
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Youre welcome.

Here is the evaporator temp sensor location for whatever its worth. And the values if you wanna check it.






 
  #36  
Old 08-29-2017, 10:50 AM
Lex2008
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  #37  
Old 08-31-2017, 04:18 PM
ssashton
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For others interested, the wire going to the compressor clutch comes from here - the white wire on the blue plug.

My wife has the car tomorrow so I didn't want to break anything by fiddling too much. I'll maybe get a chance to properly investigate this weekend.

 
  #38  
Old 08-31-2017, 04:23 PM
ssashton
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Can anybody tell me what connector is supposed to go here? I note on this thread it is occupied, but in my car is wasn't.

I'm pretty sure somebody has been in here messing about before me, as the radio antenna was disconnected.


 
  #39  
Old 09-01-2017, 08:47 AM
Lex2008
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Does the sticker on the inside of the access panel not tell you which one is the AC clutch relay?

I can check my Mini tonight and load a pic to see if youre missing a relay. Ill check the Bentley manual as well.

I dont now why AllData has so many relays listed for the AC clutch.

That white wire looks a little damaged where it enters the plug, am I wrong?
 
  #40  
Old 09-01-2017, 08:58 AM
ssashton
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Originally Posted by Lex2008 View Post
Does the sticker on the inside of the access panel not tell you which one is the AC clutch relay?

I can check my Mini tonight and load a pic to see if youre missing a relay. Ill check the Bentley manual as well.

I dont now why AllData has so many relays listed for the AC clutch.

That white wire looks a little damaged where it enters the plug, am I wrong?
The empty socket id's for a plug rather than a relay. It may have nothing to do with A/C but it would be nice to know the function as every image of the fuse box I've seen in Google had a white plug in there.

The white wire for the AC clutch is not damaged.
 
  #41  
Old 09-01-2017, 12:40 PM
ssashton
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Thought I thought that before I dig deeper in the electronics I would try forcing the compressor on and see if the air actually gets cold.

I used an 11v drill battery to make the compressor clutch engage. I can't actually see if the clutch engages, but I can clearly hear it click and the rotational sound also changes a little. Clutch coil resistance measures 5 ohms.

So I ran the blowers with the A.C. button on and then forced the compressor on. I didn't get cold air! Oh no!

Anything I'm missing? I now guess the pump is actually broken.
 
  #42  
Old 09-01-2017, 02:23 PM
Lex2008
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Here is my car's fuse panel.

 
  #43  
Old 09-01-2017, 02:26 PM
ssashton
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Oh my Gauuuwd I feel so cheated, where is my white plug?!

I'm going on a hunt for it this weekend :(

Also you have more fuses. Any way you can figure out the purpose of that plug??

Thanks for trying so hard to help me with this Lex.
 
  #44  
Old 09-05-2017, 08:24 AM
Lex2008
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Originally Posted by ssashton View Post
Oh my Gauuuwd I feel so cheated, where is my white plug?!

I'm going on a hunt for it this weekend :(

Also you have more fuses. Any way you can figure out the purpose of that plug??

Thanks for trying so hard to help me with this Lex.
Wait....I'm totally confused. Your car is randomly missing parts and you dont know who took them out?
 
  #45  
Old 09-05-2017, 08:30 AM
ssashton
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Originally Posted by Lex2008 View Post
Wait....I'm totally confused. Your car is randomly missing parts and you dont know who took them out?
I bought the car used.

There is no white plug like your one has and there are fewer fuses. However I can see there are not even connectors for the fuses behind the plastic so I don't think it was ever meant to have them. I wonder if the white connector is something to do with the auto gearbox. Mine is manual.
 
  #46  
Old 09-05-2017, 08:54 AM
Lex2008
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Here is my guide for the fuses.

 
  #47  
Old 09-05-2017, 03:36 PM
ssashton
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Here is mine, which seems to match my actual fuses, other than I have one fuse in F35 where it isn't shown on the door print.

What does the symbol for F3 and F7 on your door print mean?


 
  #48  
Old 09-06-2017, 08:01 AM
Lex2008
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I dont know what those fuses are for.
 
  #49  
Old 03-06-2019, 01:12 PM
jbpkruppa
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Hi,

do you have this diagram complete?

I am working on a 2010 mini cooper a/c issue and don´t have the correct information yet... Especially the wiring between a/c panel and bsi.

Thanks in advance!

Originally Posted by Lex2008 View Post
Here is a diagram...for the gas engine, in two halves:




 
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