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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 05-30-2011, 06:47 PM
adrce55 adrce55 is offline
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Location: SF Bay Area
 
Join Date: Dec 2010
Posts: 3
Mein Auto: 528i
Homelink/Garage Opener fuse keeps blowing #21

i tried to retrofit a homelink unit on my 99 528it, but for some reason the circuit for the garage opener keeps blowing out. its fuse #21, 5amp.

its not the homelink unit, bc a new fuse will blow when the ignition is switched on even without the Homelink connected (which is also the reason why i dont think its the ground wiring).

im guessing the hot wire (green/white) is shorting somewhere...

1. anyone experience this before?

2. is there some specific place where wiring is known to get worn out/exposed, over time due to wear and tear?

3. could be something else? maybe something related to the ignition, since that power is switched 12v?

i know i could just run a new switched power wire up to the unit, but ill let that be the last resort. id rather fix it properly...
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Old 05-30-2011, 08:02 PM
JimLev JimLev is offline
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Location: MA
 
Join Date: Dec 2003
Posts: 3,757
Mein Auto: 540/6, S60 Volvo, Tribeca
Fuse 21 also powers the current cutoff relay, garage door opener, rear view mirror, park distance control module, and the cig lighter relay. FYI, some years don't have a cig lighter relay.
You need to start disconnecting these items until you find out which one is responsible for blowing the fuse.
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Old 06-01-2011, 01:49 PM
adrce55 adrce55 is offline
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Location: SF Bay Area
 
Join Date: Dec 2010
Posts: 3
Mein Auto: 528i
perfect, just the insight i needed....

thanks!
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1999 E39 528iT
1991 E30 White 325i Coupe
1990 E30 Black 325is Coupe
2004 E60 Silver 545i Sedan
--> Previous money pits 05 E55, 05 C55, 04 Cobra (ported blower), 01 E46 330i, 00 GS-R, 95 Prelude Si (NOS), 92 Civic, 90 Civic Hatch (LS/Vtec motor)
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