took donor car nav harness and ran it, reterminated the 4 cut wires at touch screen( gnd, bat and acc power and illumination) plugged in touch screen and connector under rear seat, and mounted and hooked up nav mod in trunk. powered it up and nav works perfect, but it wont communicate with radio or ac (ac remote installed too) not sure where to start to troubleshoot. radio is on and canchange statios but no touch screen control, just no coms message. same as ac.

 

did you do the blue and yellow wire like i mentioned before

 

the twisted pair between module and display is part of the harness and working properly.

 

Im looking at the schematics again, there are 2 blue yellow twisted pair. one between the touchscreen and module and the other from module to connector under rear seat that supposedly ties it to the rest of the system. cant seem to get rear clip of seat to unclip so Ill pull the plugs out and test them for continuity, but any ideas if there might be another point of failure? Just frustrating since I spent so much time separating out nav harness and only cutting what was necessary to make it plug and play. Im guessing that after the rear seat connector there is a splice to the main serial data network.

 

Removing the rear seat is not fun. The clips in the front 2 corners, I used one of the plastic molding removal tools in my set to pop them up. Then centered in the seat cushion right where your butt sits is a ~ 3/4" wide tubular fixture that is open on the side toward front of the seat that grasps a clip inset into the seat cushion. It needs to be pushed toward the rear of the car before lifting the cushion out. It's not a push with your hands and arms release. I had to move the front seats forward, move the seat backs of front seats forward to get enough room for me to sit with my back towards the front seats and press my knees into the front of the rear seat to slightly move it rearwards enough to get the tubular clips to release. Re-installation was the reverse. Pressure with knees to get seat slightly back enough to get the clips to clip into the seat then pop the 2 front clips back into the slot holders.

 

1st post in this thread has a picture of the connectors under left side rear seat =

https://www.jaguarforums.com/forum/x...s-side-206104/

 

did you say you had the harness made or was it taken from another car
because if it was taken from another x-type it has to be adapted the scp wires has to be linked

 

I stripped it carefully from another car. as for the seat. leaving it in and just working from the side since I can reach the plugs.I just unclipped them and pulled them out to the front of the seat to test and inspect. Ill put them back in proper position when I figure it out. But that seems to be the point of failure, between the plug and wherever it is spliced with rest of serial com system. as long as I have it out, trace it up the door sills to where it connects. The diagrams don't follow the wires past the connectors. just a general line diagram saying at some point they are spliced.

 

FYI. Im an industrial electrician with plenty of control experience, but with new systems there is always a learning curve. next project I got from salvage yard is voice control ended up with a module when I snagged an extra cd changer. just need a 3 way optic cable now... Savages at junkyards chop the cables instead of just unplugging.

 

read this it may help ,if not ill do i video of my spare sat nav on my bench and the wiring

https://www.jaguarforum.com/showthre...t=7735&page=85

 

well, read the post you linked. I can solve the mystery why you don't use the nav screen twisted pair and hook it to the radio pair. That is for com for touchscreen controls and data only to nav mod. too much data to send through main data link. it will crash the coms.at least it gave me a point to do a data link bypass in the left hand kickwell. Ill do a temp line just to see if it boots everything up. but still have to fix actual problem if I plan to hook anything else up in rear that needs a data link. has to be a bad joint or connector.

 

Solved the problem,did a jumper from back of rear seat connector to data wires on bottom plug attached to fusebox (no nav harness plug) and everything came to life and reconfigured all on its own! Now to trace the wire between plg and front plug to see where it is broken. I do not like dead wires and who knows what wires next to it are damaged. Next project, bumper sensors (easy) and voice control!

 

thats it, now the voice module can be found on ebay

https://www.ebay.com/itm/02-03-04-05...I9s6:rk:2:pf:0

 

already have one! it was attached to a cd changer I pulled out last week. Also got the headliner with wiring harness and mic. just need to modify the optic cable to add in the module.( need to check link sequence) I tend to collect spare parts when I can. Ill have a complete spare nav system If I find a car with nav wiring I can strip, easier the second time around. swapping around cd changers today to see which one I like better.