Hi My rear suspension failed last week and I diagnosed the problem to the a 'sticky' main solenoid ( not the two way block) 

I replaced the solenoid and checked it and the compressor  before re- fitting to the car. 

Guess what/ The compressor doesn't work as there is s no 12v to the compressor 

The fuses (152 and 182) are fine and the relay works when tested 'on the bench'?

Any ideas guys? 

Morning Todd

Welcome to the Forum

First simple thing is actually change the fuses on my 4.6is the 30a compressor fuse was blown changed it for a (Halfords) 30a no go ? checked everything several times could find no fault swapped it with another 30a fuse everything worked still haven't figured out why?

If the simple doesn't work then it is continuity testing on the 12v feed to find out why a look at a wiring diagram would help if you have access to one

Good Luck

Dave

6 hours ago, Greydog said:

Morning Todd

Welcome to the Forum

First simple thing is actually change the fuses on my 4.6is the 30a compressor fuse was blown changed it for a (Halfords) 30a no go ? checked everything several times could find no fault swapped it with another 30a fuse everything worked still haven't figured out why?

If the simple doesn't work then it is continuity testing on the 12v feed to find out why a look at a wiring diagram would help if you have access to one

Good Luck

Dave

 

Thanks for your input. I checked the the DC Voltage with a meter on either side of the fuses (152 and 182) on top ,so I know the fuses are good

I also checked the relay 'on the bench' and it's functioning too.

Maybe the car needs a reset with a BMW Diagnostics kit as there is still an icon on the dashboard which will not clear?  

new  to  this  so  not  sure  if  this  is  correct  'place '     i  have  a  2013  520  estate  ,rear  suspension not  right  !!  seems  airbags  were  replaced  by  previous  owner   ...mechanic  says   module  has    been  disconnected at  some  stage  previous ... he  hasnt  repaired  one  before  but  is  willing  to  remove  it/try  fix  it  but  of  course  cannot  be  sure  ..am  told  they  are  quite  expensive  though  if  need  be  bought  ...also  see  some  people  replace  air  one  with  conventional  shocks/springs  ...really  lost  on  all  of  this  as  to  best/easiest,,,,  least  expensive  solution  ...         thanking  ye  in  advance  !!

Morning Frank

Welcome to the Forum

Rear Suspension not right ! Isn't much to help diagnose your problem so (1) is the system loosing pressure overnight ? (2) Is the compressor running (you should hear it under the back of the car) ? What dash warnings are you seeing ?

Genuine air bags are around £80 each A replacement compressor £130 A Control unit (second user) £50 then there are 2 ride height sensors £25 a pair 2 fuses and a relay. So the system isn't complicated and can replaced completely for around £350 to £400, most common issues I have seen are leaks. If the system is loosing air the compressor ends up over running and either timing out (dash warning) or wearing out and while it will run it just can't produce enough pressure.  

My guess is, that if the previous owner changed the air bags the compressor is possibly on it's way out, easy to change a real plug and play job. 

Hope this helps

Dave