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Old 05-23-2009, 09:56 AM
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Retrofit an Autodim, compass & Homelink mirror for $100 onto my 2006 X3

This would work for the X5 as well, so I'll post it here to help anyone that wants to do this...

I just retrofit an Autodim, compass & Homelink UGDO mirror for $100 onto my 2006 X3.

First, I won this mirror for $100 on ebay:
BMW MIRROR GARAGE OPENER HOMELINK 3 5 7 X5 SERIES OEM:eBay Motors (item 170330099917 end time May-18-09 14:43:47 PDT)

It came froma 2007 750, and the seller said it had a Homelink garage door opener feature. Turns out it also had a compass. Sweet.

Anyhow, I retrofit a compass mirror onto my e46 a few years ago and that was much more challenging. My e46 did not have a rain sensor or autodim, so I needed to tap into a power source to run the mirror. This turned out to be a 15 minute project and totally plug and play.

These are the instructions I wrote a few years back, showing how to remove the mirror and also to calibrate the compass mirror / set the compass zone:
BigPatsFans.com


Here is a comparison of my 06 X3 mirror vs. my '07 750 ebay mirror:



The harnesses on both mirrors turned out to be identical:


...and a comparison of the pinnouts from the BMW WDS (WDS BMW Wiring Diagram System - Model Selection) showed the power / grounds to be on the same pins:

7 series mirror pinnout:


X3 pinnout:


That was pretty much it... Totally plug and play... A dealer charges 2 hours to install this, plus about $500 for the mirror... I say I did OK here...
Some installed pics:



After calibrating the compass. Notice it works... Showing the same direction as my Garmin:
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