Hello!

I wanted to share my experience with this issue so that it will help someone in the future for the "Key Not Found" error that randomly appeared and kept my 2015 Jaguar XF 2.0T stranded in front of my house for a month+.

Symptoms:

• When attempting to start the car - it will show up with a "Key Not Found" error message or something similar
• Car will not go into accessory power
• Doors will not lock using the central locking button or the key fob
• Key fob does not lock or unlock the car
• Key fob does turn on headlights
• Car does not lock - trunk button works

Resolution Steps:
I want to start off by giving credit to the information shared on this form and others which I was able to use to get to a resolution (I will try to link to everything as I go!)

1. Make sure you have a **CORRECT** POWER SUPPLY not a battery charger! See clubairth1's recommendation on the comment below on what to use! (I got lucky, dont risk it!)
2. Have a JLR SDD Cable, I think I got mine from ebay (I can't find the exact one for some reason in my purchase history): OBD Ebay Link
3. Have a laptop with windows 7 or higher. I had a old laptop I installed a fresh copy of Windows 7 on to use.
4. Download the latest version of JLR SDD. You can find the download files from this post: JLR SDD Software Download Link
   1. I installed SDD 167 natively - Follow the steps in the "read me" files
   2. Make sure to get the Mongoose Drivers and install them too (I used a x64 OS so I got that one). Not sure if this is 100% required but I did it anyways
5. Once you have JLR SDD and the Mongoose Drivers installed, make sure the car is hooked up to the battery power supply and have your laptop on a charger or the charger nearby (just in case).
6. Connect the Mongoose cable to your OBD port and plug it into your laptop
7. Launch the SDD software. It should detect the cable and may or may not detect that your battery is connected to a power supply (recalling this from the top of my head sorry)
8. Click on "Auto Vin Read". If everything is set up correctly it should load into a menu with different rows and module names (CAN_HS, CAN_MS, SUB_MOST)
9. At the top click on "Recommendations" and you will see a long list of service functions that you can run. FOLLOW THE INSTRUCTIONS TO THE LETTER FROM SDD. It will ask you to turn the power on and off a lot, just keep following it. Here I ran the following:
   1. Battery Replacement
      • I had replaced the battery a year ago and I ran this just in case
   2. Configure New Module - Instrument Cluster Control Module (See this forum post for some screenshots and details)
      • This should get your car to start up!
   3. Immobilizer (See this forum post for the context regarding this issue)
      • This should get your key to work again to lock and unlock your car!

That should do it! At least that's what did it for me. If you are having issues getting the SDD software to connect, there's posts which go over ensuring that the USB ports being used should allow for certain settings to work correctly, or the mongoose driver needs to be installed, or try a different version of SDD. <-- try this troubleshooting first. I had initially given up after I could not get SDD to connect the first time and just sat on my hands for 2 weeks chasing other electric things or BMS connectors, etc.. then I figured I would give SDD another shot, I installed the mongoose driver this time and it connected, detected the vin, and went to the summary page!

I hope this helps and thank you to everyone who has shared their knowledge and resources! Feel free to reach out if you need some additional assistance.

 

Wrong to use a battery charger. We have gone over this many time. You need a DC power supply of at least 30 amps with LOW ripple. You got very lucky and many have caused problems using improper power supplies.

Attached is what JLR wants you to use for SDD.
Note what's printed in this document!



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Sorry clubairth1, I updated my post to reflect accordingly! Appreciate the input!