Before the Emperor went into exile I removed several bits that I wanted to transfer over to the CTBNL. One of them was a aftermarket little box that allowed music playback from a USB stick (among other things.) Ever since it has been in the silver car it would randomly stop working. After paying attention to when it wasn't working it seemed to only be after the spent several hours out in the hot sun.
The unit is past its 1 year warranty period, but the manufacturer's site has a support area where you can fill out a form and start an email conversation with one of their techs. Let's give it a go:
Me - Sun, Sep 11 2016 8:14pm
Car make: Mazda Miata 2002
Seller: Grom Audio
MAZN2 unit worked flawlessly for over a year in my 2003. Moved to a new to me 2002 and it fails to turn on sometimes after car sits during work.
Will turn on after home in garage after a few hours. Almost seems to me to be heat related. But just the other day on an evening drive it just quit working. Radio display shows CD CH at bottom like normal, but no disc-track numbers and no sound.
Them - Mon, Sep 12 2016 6:42am
I would double check the installation wiring and make sure everything is plugged in secure and solid.
Are you able to move the GROM module back to the 2003 model vehicle?
Me - Mon, Sep 12 2016 10:02am
As expected, it did not work when I got in the car at the end of the work day. This time when I hit the CD button instead of getting no music with a display of CD CH, nothing happened at all.
The 2003 is long gone.
Just to cover all the bases I pulled the Mazda radio out when I got home and unplugged and then re-plugged it back in. I then unhooked the Grom and re-hooked it back up. Then of course it worked fine. But was that because it had cooled off in the hour or so in my garage or did the re-seating of connectors fix it?
I will let you know tomorrow.
Them - Mon, Sep 12 2016 10:27am
What is the batch number to the GROM module? This will be on sticker bottom of the unit.
Please also check what firmware version is on the GROM module currently.
To check firmware version switch to USB mode of the GROM. While playing music from USB connected device i.e. USB flash drive, Android or Ipod/iphone (USB3/MST4 only).
Unplug from USB port. The track number will change and show current version number of Firmware.
Me - Tue, Sep 13 2016 11:02am
Amazingly enough when we got in the car this afternoon the unit worked. It only got into the mid 80's today. But halfway home my passenger objected to the song playing so she pushed the track up button, the display changed, but the track stayed the same. Tried track down with the same results. She turned the radio off and then back on. Now the unit didn't work at all. No sound accompanied by no disc/track display and the CD CH display on the bottom of the display.
Tonight after dinner I went out into our air conditioned garage and turned on the radio. It started playing MP3s right where it left off. The track up and track down responded normally. Something is going wonky due to heat...
The number on the sticker on the bottom is: 03-18-031314
The firmware is: 49
Them - Wed, Sep 14 2016 7:02am
Could you share with us a clear photo of the front face of the stereo for us to view?
Does the stereo have a CD changer built in to it?
If yes, does it have its own Mode or does it show up as "CD CH" as well for function?
Me - Wed, Sep 14 2016 10:14am
Radio has single CD, no built-in CD changer.
Attached are three photos:
1. When GROM Not Working
2. When Playing MP3 From GROM
3. When Playing CD From OEM Radio
We had a nice little daily email chain going there for awhile, then they stopped responding. Tonight after not hearing anything for 6 days, I poked them back.
Me - Tue, Sep 20 2016 10:16am
Hello? Did I stump the band? I attached pictures as requested and have not heard back since last Tuesday.
Do I have another option besides buying some sort of replacement?
What do you want to bet I'll get another corporate speak "Sorry Charlie" email? Then I'm not sure where I go next especially as the unit I have was $99 and is discontinued while the replacement gizmo is $130. Guess if that happens I'll try and find a cheaper option somewhere.