Homelink/Garage Opener fuse keeps blowing #21 - Bimmerfest - BMW Forums



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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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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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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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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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