LR3 Electrical Issues Caused by Sunroof Drain Leak (Key Fob & CJB)

This video documents a standalone LR3 electrical issue caused by sunroof drain failure and water intrusion near the interior fuse panel (CJB). In my case, it affected the key fob and interior electronics. This is not part of a series — it’s a real-world diagnostic and fix. Reinstalling the CJB (interior fuse panel) was absolutely terrible. It took several attempts and a lot of patience to get the rear connectors seated correctly. Related LR3 repair videos: • DIY 2005 LR3 fuse panel (CJB) removal & sunroof drain: https://youtu.be/J2YF777sTRI • LR3 bonnet open alert DIY fix: https://youtu.be/qNI5wibrgQ0 I didn’t get video of my PEX connector workaround. Honestly, if you’re doing this job, just order the correct replacement drain fitting. The PEX I used had to be slightly widened with a screwdriver to accept the stock LR3 drain tube, which made the job more frustrating than it needed to be. I reused parts from my garage, including push-to-connect fittings, but fitting the PEX into them was a pain. I was able to roll the original drain boot off the tube, which suggests replacing it entirely would be the cleanest approach. A silicone replacement might be worth looking into to prevent future breakdown. Everything is confirmed working now. I’ll deal with trim reinstallation later. 2005 LR3 4.4 V8 — likely the same drain setup on LR4 5.0. One important tip: If you want to confirm the drain fix before reassembling everything, make sure to crack the sunroof FIRST. Once the CJB is out, the sunroof won’t open. I missed that step and couldn’t verify my repair until everything was back together. Good luck with yours.