XJ XJ8 / XJR ( X308 ) 1997 - 2003

X308 Key Fob only works near the trunk

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Old Jan 28, 2025 | 10:27 AM
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Default X308 Key Fob only works near the trunk

So, once again the topic of the key Fobs not porperly working, i know.
I did browse the Forums but couldnt find a solution or new answer to my problem, which is that everything works as intended, key, programming the Fobs and unlocking the car, but only when I basically hold my Fob next to the battery. I cleaned the Coaxial Cable of the receiver and tightened it properly, which maybe increased the range by 10cm (may also be placebo) and also soldered on microbuttons in the Fob itself so the actuation should not be the problem (since it reliable unlocks near the battery).
Does anyone have another solution or method i could try? Loving the car but its a bummer that I cannot unlock it from far away.
 
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Old Jan 28, 2025 | 11:37 AM
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Weak battery in the FOB or water in the trunk near the BP module . . . guessing
 
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Old Jan 28, 2025 | 11:39 AM
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Yeah already tried new batteries multiple times and confirmed that i dont have any water leaks or water in the trunk.
 
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Old Jan 28, 2025 | 11:43 AM
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How does the other FOB work? Only have one; go on eBay and buy another (make sure series match); program and move on.
 
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Old Jan 28, 2025 | 11:47 AM
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I have 3 FOBs in total and all of them work excactly the same, 2 soldered ones and one "unmodified" Fob. Doubt all 3 are damaged.
 
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Old Jan 28, 2025 | 12:19 PM
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Trunk lock actuator getting weak?
High resistance wires due to RH trunk hinge almost broken wires. Just trying to think outside the box a little.
 
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Old Jan 28, 2025 | 01:10 PM
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Hm, trunk lock actuator is not really getting weak. The antenna is also not running through the trunk hinge i think? It connects to the window doesnt it? Will check for any brittle wires anyways in the hinge, thanks!
 
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Old Jan 28, 2025 | 07:57 PM
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The coax has TWO ENDS!
You checked the receiver end but did you check the aerial end?

The 'button' on the back glass windscreen needs to have contact.
 
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Old Jan 29, 2025 | 01:53 PM
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Middle bottom of rear Window, something missing
Middle bottom of rear Window, something missing
So I just went down to check the aerial end. Is it at the top? If so it is making proper contact. If it is at the bottom, it seems I am missing something? I attached a picture, maybe someone can also help me identify what goes on there?
 
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Old Jan 29, 2025 | 02:14 PM
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The connection is at the TOP of the glass.
 
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Old Jan 29, 2025 | 02:28 PM
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Hm well then it is connected. Unlucky, any other possible solutions? Thanks anyways!
 
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