Grom BT3 Not recognised as CD changer - 03 z4 with NAV

TankWalker58 · Post by **TankWalker58** » Fri Nov 30, 2018 4:50 pm

Hi,

I fitted a grom BT3 BMW with harness to the port where the CD changer should be. It is now not picking up the Grom when I turn on the radio, but I am able to connect to the Grom by Bluetooth. I've checked all the wiring and it seems fine. Anybody know why this wouldn't be connecting?

Thanks.

Phoenixboy · Post by **Phoenixboy** » Fri Nov 30, 2018 4:54 pm

you will probably get a better response if you intro yourself in the newbies section, and pop up some pictures of your z.
welcome anyway.

TankWalker58 · Post by **TankWalker58** » Fri Nov 30, 2018 10:19 pm

Thank you.

I've been trying desperately to find somebody with the same issue as me and haven't found it anywhere. On any BMW forum.

IAmOrion · Post by **IAmOrion** » Fri Nov 30, 2018 10:27 pm

TankWalker58 wrote: ↑Fri Nov 30, 2018 4:50 pm Hi,

I fitted a grom BT3 BMW with harness to the port where the CD changer should be. It is now not picking up the Grom when I turn on the radio, but I am able to connect to the Grom by Bluetooth. I've checked all the wiring and it seems fine. Anybody know why this wouldn't be connecting?

Thanks.

Aren't you supposed to access the GROM via the CD button still!? From memory the grom unit mimics the multi-changer

NickDE · Post by **NickDE** » Sat Dec 01, 2018 12:35 pm

Agree. You need to scroll through the Mode button - radio, CD, CD changer. The GROM won't automatically override radio mode. When you get to the right mode you should get a voice saying 'USB' or similar - that's the GROM telling you what it is using as an input.
Otherwise check both CD Changer connectors are firmly plugged into the GROM adaptor cable.

IAmOrion · Post by **IAmOrion** » Sat Dec 01, 2018 12:39 pm

NickDE wrote: ↑Sat Dec 01, 2018 12:35 pm Agree. You need to scroll through the Mode button - radio, CD, CD changer.

That was it!!! I knew it was something like that. I used to have a grom unit back when I had a 330Ci M Sport ... same unit just different connection cable, but I presume worked the same. Had to select CD Changer, and the Grom can mimic 6 different cds (I used them as diff playlists)... I Imagine their units have improved software/firmware wise over the years

TankWalker58 · Post by **TankWalker58** » Sat Dec 01, 2018 4:39 pm

Yes. And when I cycle through the Mode buttons it only gives me the option of the single CD port and Radio. No CDC mode.

NickDE · Post by **NickDE** » Sat Dec 01, 2018 4:58 pm

The radio unit is not seeing the GROM. Check the wiring carefully.

TankWalker58 · Post by **TankWalker58** » Sun Dec 02, 2018 9:29 am

Do you know which cable it would be? Is it on the 3 pin or the 6 pin do you think?

NickDE wrote: ↑Sat Dec 01, 2018 4:58 pm The radio unit is not seeing the GROM. Check the wiring carefully.

Post by **srhutch** » Sun Dec 02, 2018 10:11 am

Might be worth pulling the head unit just to make sure the changer plug it is still connected that end.

NickDE · Post by **NickDE** » Sun Dec 02, 2018 1:42 pm

The GROM is alive as your phone can see it. But the head unit can't. Seems like a connection somewhere. srhutch is right, could be connections at the head unit, or could the connections at the GROM end. I had problems with a secondhand GROM, turned out to be a dodgy adapter cable, once replaced with a new cable all was well.

TankWalker58 · Post by **TankWalker58** » Sun Dec 02, 2018 10:26 pm

It's definitely at the Grom end. If I plug the CD changer back in, it shows up again.

Jembo · Post by **Jembo** » Sun Dec 02, 2018 10:34 pm

When I fitted mine, thought I had the choice between the boot CD changer or the head unit.

So, maybe try rewiring from the head unit?

Post by **srhutch** » Sun Dec 02, 2018 10:36 pm

TankWalker58 wrote: ↑Sun Dec 02, 2018 10:26 pm It's definitely at the Grom end. If I plug the CD changer back in, it shows up again.

Issue with the grom by the sounds of it then.

TankWalker58 · Post by **TankWalker58** » Sun Dec 02, 2018 10:56 pm

Thanks mate, I'll send it back and get it changed. your Z looks sick by the way.

srhutch wrote: ↑Sun Dec 02, 2018 10:36 pm
TankWalker58 wrote: ↑Sun Dec 02, 2018 10:26 pm It's definitely at the Grom end. If I plug the CD changer back in, it shows up again.
Issue with the grom by the sounds of it then.

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