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See more details about replacing your E320/W210 head unit on this forum thread: http://www.benzworld.org/forums/w210-e-class/2480193-head-unit-replacement-tips.html

Documented a few things that I went through while trying to replace the stock Becker head unit / receiver with an after-market unit. I put in the Pioneer DEH-X6700BS (http://www.crutchfield.com/p_130X6700BS/Pioneer-DEH-X6700BS.html) but very little of this video applies to that actual unit. Most of the video is dealing with the E320 / W210 quirks.

I ordered from Crutchfield because they have everything I need (assuming I ordered correctly, which I didn't) and also great customer service to help me through the install (called three times and got a live helpful person within a minute each time).

Things you will see in this video:
- How to determine if you have a Bose system (somewhere in one of the following: head unit display, speaker badge, VIN decode, original window sticker, badge on rear panel, amp, sub)
- Metra 70-1786 harness
- Scosche SLC-4 line output converter
- How to use the Crutchfield supplied keys to pull the Becker unit
- Description of each of the cables/connecters into the head unit
- How to remove the sunglass compartment
- How to remove the ashtray / cigarette lighter
- How to use the cigarette lighter lines for ACC 12v and dimmer connection
- Bad practices of doing electrical work with the battery still attached and tapping into plugs. This is an information video only meant to show you how to access / remove certain items. Please use discretion in working with your own electronics.

Hope it helps save someone else a few hours of their own research.