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      11-08-2009, 05:08 PM   #1

Drives: 09 TiAg E92 335i M-Sport
Join Date: Sep 2006
Location: NJ

iTrader: (8)

Lightbulb Relocating the OEM radio to the trunk to retain CHIMES w/ an aftermarket headunit

This is for people with aftermarket headunits only.

Here's what you need:

Metra 70-9003
(Plugs into your Dash Harness)

Metra 71-9003
(Plugs into your OEM Radio)


You need to run five wires from the dash to the trunk. Three of the wires are to connect pins 9, 11 and 15 on 71-9003 to pins 9, 11 and 15 on 70-9003. The two remaining wires are for a small speaker (8 Ohm) so you can hear the chimes. This speaker gets mounted in the OEM location under the driver's side dash. Pin 12 on 71-9003 gets grounded in the trunk.


This is very important. DO NOT assume that all the pinouts are correct on the Metra 70-9003 and Metra 71-9003 wiring harnesses. You MUST verify that all the pins are in the correct places. Depending on where you got the harness, you have have to move some around.
Use this diagram:

2009 E92 335i M-Sport TiAg|Black|Aluminum -ZMP|ZPP|NAV|CA|Heated Seats|6MT
BMW Performance Exhaust|Rear Fogs|OEM Black Grills|Cobb AP|ETS 5" FMIC|DCI
Installer for BimmerTech

Pioneer AVIC-Z110BT:

Last edited by srcstc; 11-10-2009 at 12:54 AM.