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E28 (1982 - 1988)

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Old 09-08-2011, 05:20 PM
Tecmec Tecmec is offline
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Location: Connecticut
 
Join Date: Mar 2010
Posts: 21
Mein Auto: 1987 531is
B/C Horn Diode and Board Computer Horn

On the 1987 535i (pre March 1987 manufacture date) there are items called B/C Horn Diode and Board Computer Horn. Both are located beneath a plate just to the rear of the battery on the left side front of the vehicle. I need a primer on these items. I see both identified in pictures in the Factory electrical and trouble shooting manual but not a word in the Bentley manual or else where in the references I have. The way they came to light to me is I have a kill switch on my negative battery post. On occassions when I close the switch the horn will beep once or twice or for a second or so but not continue after the switch is closed. Can anyone educate me on these item and what they are supposed to do for the vehicle. Thanks
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