I have been working on a no sound/no volume display on my LR3 for a few nights now. I am getting a Red light from the MOST cable but not from the AMP itself. When I test the red cable on the left of the unit, which is power from what I can tell from the wiring diagrams, I am not reading anything. I traced that wire to the large flip connector on the bottom of the CJB. When I took the connector off I tested the male part of the connector that leads to that wire and am not getting power. The blades around it that are power connectors are reading good power. Is it possible to have just that one blade go bad? Or is there a problem elsewhere and the car is telling the CJB not to send power to that connector?
As a background there was water coming in through a bad sunroof drain on that side, everything has been dried out and all other systems are working perfectly. Battery has been tested and is perfect. Radio has come on a few times including after fuse removal and hard reset, but also has not come back on after trying those again.
I've done my best to go through the RAVE, TSBs, and other threads before starting one, but if someone has any advice I'd appreciate it.

 

But you did not check the fuse?

 

Hey thanks for checking, yeah I did check all the fuses. I did try replacing them on the off chance it was a weak fuse.
Working on a replacement Amp to see if thats it, also have a stereo ECU flash coming from GAP. I dont have high hopes for the amp unless the system wont send power unless it is "requested" and the amp isnt requesting

 

Based on wiring diagrams, the amp gets power from the 30 amp fuse which is to battery. No relays, etc. So I don't think the power supply is smart in any way. Usually if there are audio issues, its the amp itself. You can get a MOST loop and remove the amp from the network. If the MOST errors go away and the network functions then you know its the amp for sure. Some devices will not show a red MOST output in the port if the network is offline, it will power down the network transceiver.

 

Ill add that to the list and grab a MOST loop.
Thanks!

 

Sometimes you can take the fiber ends out of the connector and joint them together by hand or with strong tape, etc. The key is a tight/stable junction.

 

I have a MOST loop showing up today so hopefully that will help with the diagnosis. I appreciate all the help!

 

Tried the most loop and the ECU flash with no luck, new amp should be here by wednesday or thursday, well see how that goes!

 

Turned out to be the amp. Plugged it in and sound right away. At least I learned about some of the wiring during the process.
No exterior signs of water damage to that area, i'm going to try and take the amp apart to see what went wrong