2020 TRD Pro with JBL audio aftermarket stereo rebooting

What’s up guys? It’s been a while since I posted. So back in the summer of 2022, when I first bought my Tundra, I put a really nice aftermarket stereo in it. I bought it through Crutchfield and paid for the service of them to pre-wire my harness for me. This was partially just to save time, but also because wiring diagrams and pinouts seem to be hard to find for my year truck with the JBL audio.

Anyway, every that’s worked great and the aftermarket stereo controls the factory amp and everything. But I have always had an issue with the stereo randomly restarting. And if there’s a rhythm or reason to it, I have yet to figure it out. But it has become very frustrating and annoying. Sometimes it will do it a few times in a 30 minute drive and sometimes it won’t do it at all.

So for anyone who isn’t very knowledgeable on power supply to car stereos, it’s pretty basic. There are 3 wires associated. Constant power, key on power, and ground. Constant power keeps your memory and programmed settings, ground is always grounded, and key on/off power is what turns the radio on and off with turning the vehicle on and off. But if your vehicle uses a CAN bus it can be much more complicated than that.

Every time it happens, it’s just a brief moment that it loses power and always comes back on. But I have to wait for the boot process and the time for my Bluetooth to reconnect my phone. I have read about people with factory head units having the issue and doing a software/firmware update to fix it. Obviously that doesn’t apply to me since I’m not longer using my factory stereo.

Does anyone know a fix for this?

My electronics brain is telling me that something HAS to be happening that’s causing an ever so brief loss of one of those 3 wires, but comes right back. So I’m thinking about tapping into the ground with my own ground. And then maybe wiring in a capacitor to the key on and constant power wires. So that they will hold a small charge and bridge the gap of intermittent losses of power. It would also make my stereo stay on a short amount of time after turning the key off, until it discharges the capacitors, but I can live with that.

Or maybe I should find my own constant power and key on power outside of the factory stereo provided ones I’m using and use those instead.

It is NOT my head unit. I have tested it several times. It has something to do with the factory harness provided constant power, key on power, or ground.

Ideas??? Thanks!!

 

Sorry for the long post but I'm bored, on painkillers, and stuck in the house for a month.

I've had 4 different aftermarket HUs in my 2014.
Every one of them at one time or another rebooted itself for no reason.
The current one will drop the Carplay and I usually have to restart the HU to get it to reconnect.

It has been 9 years since I had the Entune HU, but I also remember it rebooting.
It just wasn't a big enough issue to warrant spending a day at the dealership so that they could tell me they couldn't replicate the issue.

Your system.


The capacitor addition may work, that would be worth a shot.
As well as finding another ground.
Remember your amp also has it's own power and ground with the remote on triggered from the HU.


Perhaps you could try a different battery connection and see if that fixes the issue.
Although the OEM Batt feed does come uninterrupted from the battery, except for the in-line 20amp ECU-DCC fuse to the radio fuse.
It is the red wire on top that goes through the short pin.


The ACC (IG) ECU-IG1 NO. 4 fuse may also cause it to reboot as well.
An interruption in it would be like turning the key off.


That circuit goes from the battery to the 180 amp ALT fuse, the 150 amp LH-J/B fuse, to the IGN NO.1 relay.
It is the third line (second black wire) from the top on the right


Also with your JBL HU, amp, rear camera, and Navigation, you've got 10 different fused power connections to the system.
Not saying all could cause a reboot, but you never know.

Keep us posted on your results.
Good luck.

Wiring diagrams are found here.
Ultimate TUNDRA Wiring Diagrams Collection | Toyota Tundra Forum

 

Thanks for the reply! You’re the only 1 so far!