Head-unit Constantly Rebooting...

I have an aftermarket Kenwood head unit and a Maestro RR2, and I am not currently experiencing any head unit reboot issues.

I will say that prior to iOS 14.1 and 14.2, I was having them constantly. I have an iPhone 11. Prior to that, i had an iPhone 8 Plus running 13.3, and I maybe had 3 reboots over a couple of months. I traded it in on the 11, and it had 13.7 on it when it arrived, and it worked well. I didn't experience any reboots for the few days that I had it prior to updating to 14.0 Then it started rebooting 5-6 times a week. (Basically, it was at least once every time I drove my truck). Then iOS 14.1 and 14.2 came out, and I haven't had a single reboot. The connection quality is much better, and it is just seems smoother functioning.

But having said all of that, my Kenwood HU and Maestro RR2 are working flawlessly together with no reboots with the above caveat.

 

I may try dumping the RR altogether and see if that resolved my issue. Will try the unit by itself and then add steering wheel if all appears to be going well. Hate to drop more money into another steering wheel interface, but if it eliminates the reboot it would be worth it.

 

Previously had the rebooting issue. Now when I have my phone (iPhone 8) connected to Bluetooth it will drop calls within 5 minutes every time. Also answering call / shutting off call from the steering wheel controls or on the touchscreen works only sporadically once that headunit ‘ends call’ even though most of the time I will still be on the call just the audio has been disconnected from Bluetooth .. anyone else have this?

 

Truth is there is no fix to this problem because Toyota is too cheap to hire a developer that does constant updates to stay aligned with the Bluetooth updates. I escalated this to Toyota to no avail. It’s the reason why I won’t buy another. The last update was over 2 years ago. A shame because this is the number one complaint to the truck. The only real solution is to rip out the radio and put an after market in but who wants to do that. Sorry for the bad news.

 

my dude signed up for the forum and resurrected a 2 old thread to vent

 

This is exactly what mine does (2014). Same phone.

 

I have 2018 Toyota Tundra Limited with Entune™ Premium Audio JBL Head Unit.
I had a problem where it was constantly rebooting regardless of whether my iPhone was connected to the head unit over Bluetooth or not. I read online on forums where they said that Toyota had a TSB out (T-SB-0003-20) suggesting to apply the 13TDANNA-DA11_0164.kwi firmware to the head unit to fix the problem. I did that and it seemed like it fixed the issue for the first two days but then the head unit started the bad behavior again. I had the unit constantly restarting(12 to 15 times) on me especially at high speeds on the highway. Forget using bluetooth on the device to make phone calls, play music etc. It just wont work due to constant restart interrruptions.
I then went to my local dealership to see if they were willing to do anything especially when there was a TSB out and Toyota was trying to fix it. My truck is past three years manufacturer's warranty and also had more than 65,000 miles on it. They told me that the warranty on my truck was expired and asked if I had an extended warranty on the truck which I did not. At that point they said that they would have to charge me 150$ for technician time to diagnose what was the issue. I showed them the video and told them the diagnosis is the head unit is constantly restarting. Also the fact that Toyota had a new firmware out to apply to the head unit to potentially fix the problem which the head unit already has and there is nothing else that can be done other than contacting Toyota to get additional help, potentially replace the unit as a goodwill gesture. They said they cannot do anything untill I pay the fee and technician starts the diagnosis. Also, since the truck was out of warranty, they said toyota will charge for the head unit replacement which could be anywhere from 1200$ to 1800$.
I felt I should not be pursuing this route as money would be wasted regardless. So I asked them to cancel my appointment and took my truck back home. I figured if I was going to pay the technician fee for diagnosis and a head unit replacement fee, why not buy myself an after market headunit with apply play inbuilt on it(Search Sony XAV-9500ES plug & play kit installation).
That night, I went online and started reading every post regarding a head unit restart. I must say, I would have browsed atleast 50+ posts on this issue, online, between different forums and reddit groups.
There was a silver lining to all this hardwork.
I found online that the head unit restarting problem might be attributed to the Map reading hardware/software on the unit + SD card having faulty map information or incompatiblity with the latest firmware upgrade.
Something clicked and I thought there is one more thing I can try before I go on the route of changing the headunit myself.
Next day, I removed the Map SD Card out of my headunit which was already patched with the latest firmware listed above and, lo and behold, the head unit restarting issue went away. I drove the truck this way for a week at different speeds and never, not once, did my head unit restart. At that point, it was confirmed that something was wrong with my SD card map files. Of course, I did not had my maps working in the unit during all this time.
So, next, I went online and looked for the latest map SD card compatible with my truck. I found that 2022 OEM 86271 0E074 TOYOTA Navigation Micro SD Card was the latest map update containing SD card compatible with my truck. So I bought it and put it in my head unit. It has been couple of days and I am going strong. Head unit restarting problem went away plus I now have the latest maps in my system.
I just wanted to write all this out and share with the boarder community as I know I went thru a lot of trouble and frustration, trying to solve this problem.
Even if this post helps one more person solve their head unit restart problem, this was worth it.
Good luck!

 

Looks like I have this same issue. I'll plug in my iPhone and the screen/head unit will reboot numerous times.

Things I've done:

- replace the phone
- replace the cable
- tried a known good phone (wife's)
- tried a known good cable (wife's)
- reloaded the firmware

No change. I plan on calling the dealer tomorrow to get it replaced; hopefully they won't give me too much crap, because we'll be moving in a month or so. If they do, I'll simply have an aftermarket head unit installed.