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BMW E32 7 Series 1988-1994 (735i/iL, 740i/iL, 750i/iL) Dash board lights and gauges


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Last Post: Jul 2, 2011 4:54 AM Last Post By: jeffert
dallasnstop21

Posts: 6
Registered: 05/22/07
Dash board lights and gauges
Posted: Sep 7, 2007 3:04 PM
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Do anyone know what can cause the dash board gauge and lights to go back and forth.This also makes the fasten selt belt bell goes off and what can be done to correct the problem.Is it a fuse or something internal.
Charlie

Posts: 4,776
Registered: 12/09/03
Re: Dash board lights and gauges
Posted: Sep 7, 2007 4:54 PM   in response to: dallasnstop21 in response to: dallasnstop21
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The capacitor on the main board is toast. The fix is a new mother board, but that's $1,000 last time I checked. You can put a new capcitor in if you're handy for next to no money. Try searching the web for the procedure or get a local shop to do it for you. good luck.
dallasnstop21

Posts: 6
Registered: 05/22/07
Re: Dash board lights and gauges
Posted: Sep 12, 2007 6:26 AM   in response to: dallasnstop21 in response to: dallasnstop21
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I appreciated the input Charlie.But Do you where the capacitor is located.I am pretty handy so I just wanted to know.
GeeJay

Posts: 2
Registered: 04/20/08
Re: Dash board lights and gauges
Posted: Apr 20, 2008 11:39 AM   in response to: Charlie in response to: Charlie
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Dr. Burke,
This winter, the same problem manifested on my 91 735i sled. I plan to fix this soon and will rip apart the entire instrument housing. I have done repairs on my previously owned 318i and 535i models with great success. I suspect that the capacitor that you are referring to probably has cold solder joints at the insertion holes. If I bang on the top of the dash, gages will start to work normally for a few minutes.
I would like to know the location of this capacitor on the instrument board as I plan to replace - - rather than re-solder. I appreciate any guidance you can offer with respect to the approximate location of this capacitor. My Bentley Manual does not breakout the boards separately - pg ELE-201. Now that the weather is good, my ambition is temporarily high.
Regards, Gary S.
budpalumbo

Posts: 1,454
Registered: 12/09/03
Re: Dash board lights and gauges
Posted: Apr 20, 2008 1:59 PM   in response to: GeeJay in response to: GeeJay
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I have a disc with wiring diagrams on it, and it doesn't break the cluster down, BMW treats it as one unit. (other than the SI board) Since you can bang on it to make it work, make sure the connectors are clean and tight, and the solder joint on those pins are good first. Much easier and cheaper to do that replace a cluster.
GeeJay

Posts: 2
Registered: 04/20/08
Re: Dash board lights and gauges
Posted: Apr 30, 2008 7:12 PM   in response to: GeeJay in response to: GeeJay
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I broke into the instrument cluster and found a leaky capacitor on the main circuit board. This is the tallest capacitor on the board and is leaking from the base of capacitor. The marking on top of this cap is
1000. I have to assume that it is a 1000uF cap that is at least 16 volts.
Does anyone know what the value is of this "tall" capacitor ?
Thanks.
johnpijnnaken

Posts: 1
Registered: 04/12/08
Re: Dash board lights and gauges
Posted: Feb 19, 2009 11:59 AM   in response to: dallasnstop21 in response to: dallasnstop21
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Hi I hope you can still use this. I had similar problems with my 735i. I found Johan and Sean's E32 page online. They have lots of fixes including this particular one. It is a fairly simple fix.

You can also purchase "remanufactured" pc boards on ebay for under a 100 dollars.

John
jeffert

Posts: 1
Registered: 07/02/11
Re: Dash board lights and gauges
Posted: Jul 2, 2011 4:49 AM   in response to: dallasnstop21 in response to: dallasnstop21
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i just picked up a 1990 bmw 735i, tan looks nice, i love the body stye needs font windshield, front tires, and maybe a cluster. is there a way to test if it's toast????? THANKS

Edited by: jefferyt on Jul 2, 2011 4:53 AM

Edited by: jeffert on Jul 2, 2011 4:54 AM

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