Entune Compatability

Dealer informed me that the Entune HU software in my 2014 was corrupt - by the way - it went white screen on me and for some reason started to pull a parasitic draw on my battery. They recommended I replace on my own to save some $$$$. I was "told" my Entune (with no Nav) is compatible from 2014 - 2019. Researching ebay - and Entune HUs, plug and play seemed accurate - exactly the same. So, I bought and installed HU from a 2019 Tundra. Worked perfectly!!!!. But, I still have that parasitic battery draw from the 20 amp fuse running the HU. Battery will go dead if I don't start truck for about 3 days. If I pull the HU fuse - truck can sit for a month and start up like new.
Took truck back in to dealer for diagnosis - was told 2019 HU was not compatible. That does not explain the parasitic draw. Also, I drove in to dealer, popped the hood, plugged in the fuse, started truck and cranked the radio and showed backup camera - worked like a charm. They were unable to diagnose the parasitic draw after having 2 "master techs" attempt to diagnose. So - to the question for you all - Could this 2019 Entune actually work but still pull a parasitic draw on my battery? Do I need to install a 2014 Entune HU? Or - perhaps the draw from that fuse is coming from something other than the HU??? For now - the truck (which is detailed and for sale) sits in my driveway.....ARGH....any help out there???

 

I hope you get this fixed. I don't have an answer for the parasitic draw. But I can tell you I swapped a 2017 HU into my 2014 with no issues. I have also read on this forum that 2019 head units have been swapped into 14-19 trucks without issues..

 

Thank you Jeremy - this one is a head scratcher. Dealer Service Dept Manager actually told me to take it to another Toyota Dealer Service Department. Or, replace HU with aftermarket - which will cost me another several hundred dollars. They had no answer to my obvious question, "what if I spend more money and the battery draw still exists?" Blank stares - good question I guess.
Sent email to Toyota Corporate, very detailed, a few days back with no response yet.
I'll keep this thread up to date as I receive updates to hopefully help others in a similar situation.

 

What is the fuse labeled as and which fuse box is it in?

 

Hi Viktor - it's the 20 amp (lime green) fuse in the fuse box under the hood.
I will be letting the truck sit (not start) for a few days - then give it a try - if battery is compromised - well - hmmmm - guess I'll keep digging at Toyota Dealer - I'm certainly no master technician!

 

What is the fuse labeled as? I was going to look up what circuits it powers up other than the head unit. The colour of the fuse doesn’t really tell me anything
The fuses are all labeled on the fuse box lid

 

LOL - that cracks me up - sorry - I don't have the fuse map handy, but Toyota confirmed it is the audio fuse. And, said it pwers nothing other than th head unit....Now I am starting to think the original HeadUnit they had me replace was good....darn!!!
Thanks Viktor.....I have a few crayon shade color jokes, but I'll keep those to myself.....LOL

 

I think it’s the amp fuse. Just took a look at mine and the only lime green 20A fuses are amp and deicer

 

Thank everyone for chiming in on this - Tundra is pristine and for sale - at least until I get this little glitch fixed. I'll try to attach a few pics of fuse box and fuse under hood.

 

Sorry - large pics. 20 amp fuse powers radio no 1 and amp. I replace Head Unit along with amp. If if don't want truck to go dead, I simply shift the fuse to the open slot to right.

 

There should be some parasitic draw from the head unit for clock but very low. Also I remember reading somewhere that there’s some parasitic draw for some time after you shut down and then it drops off after a set time from other sources in the vehicle.