2009 MDX Tech Package radio wiring diagram

Old 09-14-2014, 04:38 PM
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2009 MDX Tech Package radio wiring diagram

Hi everyone, I'm new here and I did a search and couldn't find anything. I'm looking for a radio wiring diagram for my 2009 MDX tech package. I want to install two amps and a sub. Thanks!
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Old 09-15-2014, 01:34 PM
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Get yourself a manual.

Stereo Wire Diag.pdf
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Old 05-03-2019, 03:06 PM
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2009 MDX Audio Circuit

Here's the wiring diagram for base and navi trims. You'll need this to bypass or turn on the factory amplifier or make a harness that connects to the oem A and B connectors at the head unit for aftermarket radios, as there isn't a plug and play wiring harness specific to 2nd gen mdxs. I'm waiting on an OEM wired sub harness with both connectors and pinned wires to integrate with a Merta 70 1772 adapter and Pioneer head unit to turn on the amp and utilize the factory speakers and subwoofer without splicing wires. I've got the connector views and numbered pin functions as well which is what I used to translate the wire colors to the aftermarket harness.

The initial install using just the Merta harness resulted in no sound as it only connected to the factory primary wires found in connector A (input). This prompted me to obtain the service manual on (month subscription is $16). I had some spare wired jumper pins and stuck them directly into the corresponding factory A and B connector terminals and Merta harnes just to try and turn on the amp and speakers. This resulted in sound only in the front and rear door speakers and subwoofer (wired for 4 channel) with humming and static most likely due to the temporary 4 channel connections at the factory aduio unit connectors.

We'll see what happens with the custom harness and steering wheel control interface are used. Otherwise, I'm going to bypass then system altogether.
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