Retrofitted navigation ext 50 51

b357159a said:

Im using the original loom so it should have power to the nav module, today im going to check the pins there. But if im using the original loom do i have to make the connection from pin 4 and 14 to the front of the car, or do you mean that i have to run it to a different loom and if so to which one exactly?

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I had assumed you were making your own but using the original loom is definitely the best way - I am going to complete the retro-fit of an X Type loom into my S Type over the next few days.

What exactly in terms of the loom parts have got though ? the std X Type loom is in two parts with the front part being part of the dashboard loom, if you use the complete dashboard loom as well as a std rear loom then you should have most of the connections that are needed, if you stripped the dashboard loom for the satnav parts then additional connections will be needed, I will put a link to my additional connection diagram later.

The NA7 4 & 14 connections for the std loom end up at the blue connector (CA414) under the rear seat and then continue to this connector

CA240 12-WAY / GREY / CABIN HARNESS TO INSTRUMENT PANEL HARNESS LH LOWER 'A' POST / 'A' POST TRIM

You can also connect to the blue/yellow pair in the loom about level with the front door hinge in the sill loom, using the connector above is the best way if you have the correct pins (hens teeth) to add the wires to the loom as they would have been for a Jaguar std fit sat nav. The probable reason they were omitted is that with nothing connected to CA414 the SCP network blue/yellow wires are unterminated (open circuit) and will cause network failure through RF noise & electrical reflections etc.

However the above is secondary to the first problem you need to resolve as the above is not the cause of your 50/51 errors, sort the 50/51 problem and then look for the second set of SCP pairs as above. Once the screen comes alive press audio and you should have a 'Communications Failure' message - this is the classic symptom for NA7 4 & 14.

Anyway I was being a bit dim yesterday, the lack of screen & 50/51 is (almost) definitely down to a comms failure between the nav unit and the touch screen. The following is from the Jaguar fault finding doc - I will put a link to this later.

--------
$A208 Communication failure between navigation module and navigation switch
and display module
1. Disconnect the navigation switch and display module electrical connector IP070
and check resistance through switch and display module between pins 4 and 15. Is
it 68 ± 7 ohms?
If NO - Replace the navigation switch and display module
If YES - ↓
2. Disconnect the navigation module electrical connector NA001 and check for
continuity through the module at pin 7 to ground and pin 20 to ground. Is there
continuity?
If YES - Replace the navigation module
If NO - ↓
3. Check wiring harness for integrity between electrical connectors IP070 pins 4 and
15 and NA001 pins 7 and 20. Is a fault present?
If YES - Replace or repair the affected wiring harness
If NO - ↓
4. Does the fault code 50 or 51 appear on the small LCD display?
If YES - Replace the navigation module
If NO - Replace the navigation switch and display module

LCD DISPLAY FAULT CODES

CODE DESCRIPTION
50 Communication failure between control module and display unit at startup.
51 Communication failure between control module and display unit during operation.
52 Communication failure between control module and display unit during operation.

Best of luck with all that. :0)

That is the diagram I used. I have one connection from the blue/yellow on the nav screen to the blue/yellow of the audio system and from there to the blue/yellow on the loom of the navigation module.