Hi guys,

wondering if anyone can help me with this head busting issue. I got a LR3 which at the moment seems to throw issue after issue at me. So the Nav screen is completely black and the radio does not play ball either, no time on the radio nothing, just dead.
I read through a few forums and saw that fibre optic runs into both. I pulled the nav screen out and looked at the fibre optic cable to see if I could see a red light coming from the cable, to which I couldn’t. Anyone know if that’s the answer? And if so how do I resolve it.
please help.

 

I have read of this before and the amp can be the problem so check the most cable at the amp.

 

Did it work before? Check fuses and the infomat relay. The Nav unit, if getting power, will at minimum display the Land Rover logo even is MOST network is down. Since its not coming on at all, that typically indicates the infomat relay is not sending power to the Nav and Amp on. They have constant 12v supplies and the infomat relay provides a second source to trigger them on. Much like aftermarket head units and amps use too.

 

Thank you for your response, I have not heard that so definitely going to give that a try. Does the Amp sit in the boot of the car?

 

thank you for reaching out with your help. Since I’ve had it unfortunately no it hasn’t worked. Yes, I was expecting Atleast the Land Rover logo when switching it on but nope it gives me nothing. I have checked the fuses but they seem to be fine. I will look at the infomat relay, where do these sit?

 

I think you need to do a systematic check on all the electrical connections. There are several grounds and 12v sources that receive their power/ground source through splices and these can go bad. Additionally, connectors can corrode.

I would start with the verifiable connections outside the radio -- the center console isn't too bad to remove but it's more involved than what I will describe below:
1. pull the seat bolts over the DVD player (US driver side) they are large torx bolts so you'll need a range of torx bits. You do not have to remove the seat, you can just tilt it back for access, and underneath the seat you will see the DVD/nav player. Remove the connections and examine them. You're looking for blue/greenish corrosion on the connector plugs. These will probably be OK -- there's not a ready source of water here, but it's easy to check and it's possible there is a pinched wire.
2. the main connection between the radio and the body harness is US front passenger side on the side of the footwell. There's like a 16 (ish) connector black plug with a red plastic lock (I'll try to post a picture, I had to remove mine for corrosion). You need to remove one of the lower right trim pieces to access this, and you might need to pull some of the floor/door trim and door seal (just pull them off, they are friction fit). Inspect the connector, you are looking for that same blue-green corrosion. Unlike the DVD player, this location does unfortunately have a source for the corrosion -- water from issues with the sunroof drains can drip here. This caused a problem for me, and if a ground or 12v drop out here you will have the symptoms you describe.

Edit: here's a pic of my connector, you can see the corrosion on the pins on the right side.

 

Thank you for your in depth explanation and assistance with this. All makes perfect sense to me and something I will task myself with tomorrow if I get the time outside of work and it’s still daylight.

I will update you with my findings and come back and thank you again if it was the root cause to my issue.

Quick question, is that red and black cable (from the screenshot sent) a replaceable part and easy enough to find?

 

While it might be purchasable somewhere, to my knowledge is not a discrete part. It's part of probably 2 separate harnesses. For my application there were 12 wired connectors out of 16 -- I ended up buying a 12 connector pigtail of Amazon and I wired that in (using heat-to-melt connectors so no soldering required) as a replacement removing both male and female parts of the connection. That solved my problems.

If you see corrosion, you could try cleaning the ends with electrical cleaner and tooth brush first. Also, if you start moving the connector around and you hear 'beeps' or partial signs of life from the NAV / audio, that's a clue you're on the right track.