Hi,
I put a previous post up about my dab signal cutting out when turning on the ignition (FM, TV fine), but I have just realised it's actually when the daytime running lamps come on. Lights off, signal fine, lights on -- 'no reception' message. I've heard about this happening before with other owners but just wondering if anybody electrically-minded might have an idea where to start with this? The only thing I do know is that one of the tail lights was replaced by land rover a few years ago. I assume it was a genuine part being land rover but that's the only light related item that I know has been swapped out and I'm not sure if something might have happened on the install. Any ideas? I'm not sure if there are even fuses for the tail lights that I could pull to try?

I did a thread on here a while back about the DAB aerials ... long story short, I would say that their placement in the upper rear tailgate spoiler area exposes them to moisture where they corrode within and corrode where they ground to the chassis, and basically just fail.

On the net, there is a lot of chat that things like the power supplies for rear dash cams causing RF interference which can affect the DAB signals ... the same could potentially be said for lights if they had switching power supplies within ... but I dont really buy that one personally. I have aftermarket rear lights in mine, and no issues were caused by the lights. It was the corrosion as mentioned above.

Found it ... I didn't start the thread afterall ...

https://www.fullfatrr.com/forum/topic69526.html V8 or else ...

Thanks for the reply. I suppose the confusion for me is that the signal is fine, perfect even, when the lights are off. I have no issues and great reception, but the minute those lights are switched on it instantly cuts out. So yeah, I would have thought if it was corrosion it would affect the dab signal no matter what the lights are doing? I don't know, electrics aren't my bag but it would be great to sort this because the FM signal here isn't great.

Thanks

Could well be a ground issue as its the current return for the circuit. I had an issue a while ago where the Adaptive cruise control would cut out randomly, but only when the lights were on, turned out to be the usual earth stud under the drivers side wheelarch, fixed that and ACC problem solved.

I'd whip the boot spoiler off and check the earth strap and grounds to the upper tailgate hinges. L405 SV Autobiography LWB SDV8, finished in Aston Martin China Grey by ETO division.

Thanks, I'll do that. Is there anywhere else I should check or is everything relating to the entertainment system located up there? How would I identify the earth strap or would it be pretty obvious?

The aerial earth's are under the spoiler, it's obvious once you remove it as they are bolted under the hinge nuts, just have a helper as you need to lift the spoiler and unplug a few connectors to the mat aerial, high level brake light and rear washer pipe.

When you undo the spoiler 10mm nuts hold the threaded stud with a torx socket as these are used to level the spoiler and if you screw them out you'll have to realign it.

Should be in the L494 workshop manual, but 2 plastic trims to remove over the hinges to access the nuts either side and then the others are visible. L405 SV Autobiography LWB SDV8, finished in Aston Martin China Grey by ETO division.