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So according to Grok, rear defroster relay fuse should be pulled after louvered hatch swap.
“Yes — you should pull the rear defroster fuse (and properly terminate the wiring).
On the 2024 Lotus Emira, the rear defroster is protected by a 25A fuse (position #41, labeled “Rear defroster relay”) in the rear fusebox. That fusebox sits behind the left-hand rear quarter trim panel (pull the trim off for access).
Why pull the fuse
With the glass (and its heating grid) gone, the circuit becomes an open load. Modern body/climate modules often monitor current draw or continuity on the rear defroster circuit. An open circuit can set a fault code, trigger a warning, or cause other electrical quirks if the system tries to activate it. Pulling the fuse disables the circuit entirely and avoids that. This is the same precaution others have mentioned in Emira forum discussions about the 420 louvered hatch swap.
What else to do
• Disconnect the defroster power and ground connectors from the glass tabs before removing the glass.
• Properly terminate and insulate those wires (heat-shrink, electrical tape, or a proper connector cap) so they can’t short or get damaged.
• The fuse may also feed the heated door mirrors (the manual groups “Heated Rear Screen/Door Mirrors” together). Pulling it will likely disable the mirrors as well — acceptable for most people doing this mod, but test afterward if you still want mirror heat.”
Fuse #41 is easy to get to so if glass installer doesnt pull it, I can.
I’m sure the professional glass shop will know what to do. Ironically, I’m more skeptical about Lotus Service knowing to terminate the wires and pulling the fuse when swapping…..lol.
“Yes — you should pull the rear defroster fuse (and properly terminate the wiring).
On the 2024 Lotus Emira, the rear defroster is protected by a 25A fuse (position #41, labeled “Rear defroster relay”) in the rear fusebox. That fusebox sits behind the left-hand rear quarter trim panel (pull the trim off for access).
Why pull the fuse
With the glass (and its heating grid) gone, the circuit becomes an open load. Modern body/climate modules often monitor current draw or continuity on the rear defroster circuit. An open circuit can set a fault code, trigger a warning, or cause other electrical quirks if the system tries to activate it. Pulling the fuse disables the circuit entirely and avoids that. This is the same precaution others have mentioned in Emira forum discussions about the 420 louvered hatch swap.
What else to do
• Disconnect the defroster power and ground connectors from the glass tabs before removing the glass.
• Properly terminate and insulate those wires (heat-shrink, electrical tape, or a proper connector cap) so they can’t short or get damaged.
• The fuse may also feed the heated door mirrors (the manual groups “Heated Rear Screen/Door Mirrors” together). Pulling it will likely disable the mirrors as well — acceptable for most people doing this mod, but test afterward if you still want mirror heat.”
Fuse #41 is easy to get to so if glass installer doesnt pull it, I can.
I’m sure the professional glass shop will know what to do. Ironically, I’m more skeptical about Lotus Service knowing to terminate the wires and pulling the fuse when swapping…..lol.
My tailgate is still at the body shop as the owner has gone on holiday for a few days. That's fine by me as I'm in no rush and it will give me time to figure out who's going to sort the install and wires out for me!!
