E39 - Need help troubleshooting - bad/no sound on right side of car

[Dustin1]

Hello, I picked up a new to me '99 E39 540iA last fall. I have been trying to track down an issue going on with my right (passenger side) speakers. This car has the hifi sound, non-DSP. Here are the issues I am having:

- Front tweeter - has sound (I can't say it is as loud as the front left tweeter)
- Front mid (on the door panel next to the vent) - very faint.
- Front woofer - no sound
- Rear door tweeter - faint static only
- Rear woofer - no sound

Here is what I have tried in my troubleshooting, all of them with no success:

- installed a different Business Cassette deck
- installed a different amp
- moved the right side front door woofer to the left side (it worked on the left side)
- installed a different MID

Yesterday, I thought it may be related to the 12 pin connector to the amp, but that connector only has wiring for the woofers (the mid and tweeters are connected to the 26 pin connector), so no way that both connectors are damaged with only damage to the right side wiring. That leaves me with 2 possibilities either 1) the wiring is damaged somewhere when it breaks off for the right side speakers, or 2) the wiring from the MID to the amp for the right side is damaged. Can anyone confirm I am on the right track, or am I missing something?

[Mark185]

If you have not fixed this yet, I may have your solution. I had a similar problem on my E39 after taking the door panel off to seal the vapor barrier because water was leaking in. I damaged the pins on the white connector in the picture attached. That circuit board is on top of the speaker enclosure. The signals from the amp for woofer, midrange and tweeter in the door come in on the white connector and go out on the blue and black connectors. I replaced that little circuit board with those 3 connectors and problem solved. I got the part from a door on another E39 I was sending to the junkyard due to accident damage. I think I kept the one from the other door but have to go looking for it. You can have it for the cost of shipping it if you need the part.