The key position chart is on to of page 98

This is where things get mixed up as some key positions make more than one pin position

See top chart page 98

X300 00/E COVER (jagrepair.com)

 

On key insertion before rotating is position 0

So 1 brings your radio on

2 powers up the Engine ECU

3 is the starter

After 3 it springs back to 2

 

1. BT4-18 > frame ground - 1.7 Ohms with brake depressed, no circuit when not depressed
2. BT4-18 > BT2-1 > pin inside SLCM (see pic) to frame ground - 1.7 Ohms

Looks like the SLCM is getting a solid ground trigger? Maybe re-seating BT4 has helped? I did go a step further to see if issue was resolved but unfortunately not (no V on BT1-9 U or BT1-3 OG)

 

Looks like the SLCM is getting a solid ground trigger? Maybe re-seating BT4 has helped? I did go a step further to see if issue was resolved but unfortunately not (no V on BT1-9 U or BT1-3 OG)

Yes , looks to be a issue inside the SLCM , trying to cover bases before that

SLCM properly grounded on pin BT1 - 13 and 14 ?

So this would be the other SLCM connector from the BT2

Both ground wires Black / Pink color , this is a odd ground stud location that can get disturbed on rear seat removal so you can provide a ground path on a different existing ground stud location like on the side of the battery tray

 

Yes, 0.2 Ohms from solder inside SLCM to ground stud.

 

Time to source a SLCM

https://parts.jaguarlandroverclassic.../brand/jaguar/

 

Had a feeling. I've sourced some solid state relays as these seem to be a common failure on the SLMC. Should be here in a couple of days.

Thanks so much for sticking with me on this. I really appreciate it. I've learnt a ton. Will update once I've installed the replacements.

 

Take good pics of your repair that others behind you can follow

Would you with your knowledge be able to hard rest the SLCM outside of a hard reset of the whole car

The hardware in the SLCM may be OK and locked in a frozen state

A whole car hard reset in the UK locks out your original Jaguar stereo head as a security design

 

Will certainly take pics and post. I have the radio removed at the moment, so safe to hard reset or no?

 

US models were safe from this up to year X ( X300 models )

All X308s were not safe from this from my understanding

In a hard reset the positive battery terminal cable is connected to ground draining the capacitors and latching gates in the devices

This brings the logic steps ( or commands to items like solid state relays ) in the device to zero state or to be able to trigger or change a item to a desired state

 

SUCCESS!!!

@Parker 7 - Sir, thank you so very much. I'm so happy we got a result. Thank you for sticking with me on this.
.

Here is the replacement part on the right (please don't hate on my soldering skills!!)

 

So it was a hardware component / relay

Part # and source for others?

I see it now BTS409L1 SMD

https://www.infineon.com/dgdl/Infine...5aa9b0a1b7361a

Liquid solder ? I get mine in a small syringe tube from a local electronics store in town

 

Yep, mentioned replacement part # in my last post and the eBay vendor I bought them from. Sorry, not familiar with liquid solder.

 

Trying to find picture and it wicks up easily into your work with little carry over across pins

Low melting point to protect the device

 

Interesting. I shall grab some for the inevitable next project.