Check the wiring loom that goes into the center console. I believe there was a known problem in there with shorting.

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Thanks for the tip.

Whatever it is…. It’s not a small drain when it happens. The reason the GROM turned off again is because the battery was completely dead again. In 2 days. With a 4amp trickle charger connected to it!!!

Trying to recover the battery again and hoping i won’t have buy another new one.. and then will hook up my new Bluetooth data logging multimeter to see what the current drain spikes up to.

The short was bad enough to torch a few cars, but shorting in there can easily hit the phone wiring etc..

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:wow::wow:

Better get onto that sooner rather than later then!

So I've been digging into this over the last week or so and I think I'm getting close.

Problem 1 was definitely the DVD nav unit never sleeping. I replaced that and the load dropped from 0.6 to 0.2A.

Problem 2 is something on Fuse 73. According to the fuse panel this shows up under Telephone, Navigation, Display Unit... so one of those. I know its not the bluetooth unit as disconnecting that had no significant effect. I'm assuming its what's referred to as the TCU which is known to be problematic.

What I can't figure out though is where on earth the TCU is/ what it looks like or a part number or something. I've tried searching on here and Google but so far no luck.

Anyone know what exactly runs off fuse 73?

Looks like Fuse 73 feeds power to the K3 unloader relay. This relay provides power to the Nav monitor, the GPS Rx, the telephone interface and possibly the antenna diversity module.

So... a lot of stuff.... :rolleyes:

Thanks. Appreciate that. Don’t suppose you have any idea where the telephone interface is? Lots of chatter on the internet about this being responsible for the battery drain but i really can’t find anything about where it is or what it looks like.

The basic telephone module may not be fitted but if it is, it's in the rear left cubby...

https://i.ibb.co/c27yxqS/CTlJroVH.png

Thanks, that looks like the Bluetooth module. Already tried unplugging that and it didn’t make much of a difference :( guess it’s one of the other things on that circuit then. Sigh.

Thanks for your help wpoll

Check for final stage resistor drain. It is a common problem