1989 E30 325i rev counter and second computer stopped working?

Notices
 

Thread: 1989 E30 325i rev counter and second computer stopped working?

Reply to Thread
Results 1 to 9 of 9
  1. 1989 E30 325i rev counter and second computer stopped working? 
    #1
    Bimmer Fan
    Car Details
    augha's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1989
    Transmission Type:
    manual
    Car Body Type:
    coupe

    Join Date
    Jul 2009
    Location
    N.Ireland
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts
    I have an e30 325i which i have been restoring over the winter. I recently got it finished but had to disconnect most of the wiring in and around the passenger footwell to get at a bit of rust. I connected up the wiring again and now the rev counter and on board computer won't work. The display on the computer unit lights up but no digits are displayed. I have noticed a small yellow wire with a connecter on the end of it hanging lose out the back of the unit. Does this connect to anything?? I have disconected and reconnected all the wiring to check i haven't missed something with avail. Anyone who can shead some light on this will be a star. Thanks
     
     

  2. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  3.  
    #2
    BMW Guru
    Car Details
    billywhizz1984's Car Details
    Model of Car:
    E36 323i x 3, 325TDS x 1, 320i x 2, 318is x 1
    Year of Manufacture:
    1999 x 2, 1998, 1997 x 2, 1996, 1995
    Transmission Type:
    Manual, Auto, Auto, Manual, Auto, Auto, Manual
    Car Body Type:
    Touring x 4, Convertible x 2, Coupe x 1
    billywhizz1984's Avatar
    Join Date
    Sep 2009
    Location
    North East
    Posts
    2,493
    Images
    4
    Thanks
    165
    Thanked 933 Times in 703 Posts
    The LCD crystal on the OBC is weak in tthe E30 and is prone to cold/frost. The Instrument / dash panel has two rechargeable batteries soldered to the circuit board. With no battery connected they run out . Try leaving the battery connected for a day or two to see if they charge up. If not you can replace them...

    http://www.e30zone.eu/e30zonewiki/im...sh_battery.PDF
     
     

  4.  
    #3
    Bimmer Fan
    Car Details
    augha's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1989
    Transmission Type:
    manual
    Car Body Type:
    coupe

    Join Date
    Jul 2009
    Location
    N.Ireland
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts
    I have had the battery connected for the past few weeks. still no different. Would it be possible that the rev counter is faulty?? Cause the mpg gauge on the intstrument cluster isn't working either. It all seemed to stop working at the same time. Is it all inter-linked and if the OBC unit isn't getting a signal from the rev/mpg counter will it not work?? Possible??
     
     

  5. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  6.  
    #4
    BMW Guru
    Car Details
    billywhizz1984's Car Details
    Model of Car:
    E36 323i x 3, 325TDS x 1, 320i x 2, 318is x 1
    Year of Manufacture:
    1999 x 2, 1998, 1997 x 2, 1996, 1995
    Transmission Type:
    Manual, Auto, Auto, Manual, Auto, Auto, Manual
    Car Body Type:
    Touring x 4, Convertible x 2, Coupe x 1
    billywhizz1984's Avatar
    Join Date
    Sep 2009
    Location
    North East
    Posts
    2,493
    Images
    4
    Thanks
    165
    Thanked 933 Times in 703 Posts
    Possible, but the back-up batteries are usually the cause of any E30 instrument gremlins. If they are the originals they don't take well to being discharged.
     
     

  7.  
    #5
    Bimmer Fan
    Car Details
    augha's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1989
    Transmission Type:
    manual
    Car Body Type:
    coupe

    Join Date
    Jul 2009
    Location
    N.Ireland
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Ill give that a go first to see what happens. When i was restoring the car it was sitting about with the battery disconnected and it was only connected for a minute or two to move it about and stuff like that. Lifting the battery terminals off and on probably didn't do much good either.
     
     

  8.  
    #6
    Dr of BMW gildersol's Avatar
    Join Date
    May 2008
    Location
    scotland
    Posts
    1,423
    Thanks
    171
    Thanked 428 Times in 356 Posts
    Haven't blown a fuse have you?
     
     

  9.  
    #7
    Bimmer Fan
    Car Details
    JasonR-325i's Car Details
    Model of Car:
    325i
    Year of Manufacture:
    1988
    Transmission Type:
    Manual
    Car Body Type:
    saloon

    Join Date
    Mar 2011
    Location
    Burgess hill
    Posts
    18
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Sorry to drag up an old thread but thought i'd add to an existing one instead.

    Anyways im new to the forum and after a bit of advice... I recently had the dash out to do some fixing. Its all back together now but the rev counter, MPG gauge and OBC has stopped working.

    People have said the SI board can cause this? Is this true? I would of thought they were completely seperate.

    Thanks, J
     
     

  10.  
    #8
    BMW Fanatic
    Car Details
    bl4ckman's Car Details
    Model of Car:
    E30 325i SE
    Year of Manufacture:
    1990
    Transmission Type:
    Manual
    Car Body Type:
    Saloon
    bl4ckman's Avatar
    Join Date
    Apr 2011
    Location
    London
    Posts
    71
    Thanks
    18
    Thanked 26 Times in 22 Posts
    I was going to create a new thread, but found this one when searching, so I'll post here...

    I've got exactly the same issue on my E30 325i (1990), everything was working fine until today, when I was connecting the radio wires to euro plugs and after I've done everything, I realized the OBC was gone and then when started the car, I noticed the rev counter not working either. So I must have shorted something or not connected properly?

    The terminal block is 30A.

    Here's how it all looks like:



    Brown = Black
    Purple = Red
    Red/Green = Yellow
    Red/Grey = Blue

    The Orange wire from the euro plug is taped.

    And then you have the wires for the speakers, the grey-grey/black and green-green/black wires are just matched up exactly as they are and white/purple ones are taped, because there's nothing to connect them to.

    By the way, when you switch the ignition ON (without starting the car), you can see that the OBC lights up, but there's nothing on the screen...And yeah, the rev counter (tachometer) stopped working.

    Would appreciate your help guys.
     
     

  11.  
    #9
    BMW Fanatic
    Car Details
    bl4ckman's Car Details
    Model of Car:
    E30 325i SE
    Year of Manufacture:
    1990
    Transmission Type:
    Manual
    Car Body Type:
    Saloon
    bl4ckman's Avatar
    Join Date
    Apr 2011
    Location
    London
    Posts
    71
    Thanks
    18
    Thanked 26 Times in 22 Posts
    Ignore the above, it's all sorted.

    I was stupid enough not to check the fuses - the fuse no 21 (7.5A) was blown, so just replaced that and it's all good

    When your tachometer+fuel economy gauge and OBC goes, you need to check the following fuse numbers: 10, 12, 21 and 27.

    The tachometer+fuel economy is 10 and 21, where both should be 7.5A, and OBC actually uses all 4 of the above fuses.

    So replace 10 and 21 as above, then fuse no 12 is also 7.5A and no 27 is 30A.

    That's it.

    Hope someone will make use of this
     
     

Tags for this Thread

View Tag Cloud

Posting Permissions
  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts