Flash with a twist.
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Tourer
Joined: Jul 2012
Posts: 284
Likes: 12
From: Eugene, Or / Sammamish, WA
Flash with a twist.
Ok the players:
2019 Street Glide Special stock HU
Arc Audio 600.4
BT-355 front and rear
Mmats 6.5f and 6x9r
Thundermax tuner
went to have the head unit flashed at a local HD dealer and they were super nice and said bring it in first thing Saturday and we will sneak you in. Great as we are full time RVers and cant get on someones schedule.
Well they took it right back and I saw them take off the left bag and side cover to access the port. I thought they would go into the back of the HU but told its all done through the ECU. When I saw the tech bring over another tech I knew it would not be a wham bam. The second tech came to me and asked what I had installed. Told him it was an ARC Audio amp. He said it wont work and the HU and stock ecu wont see a car audio amp. But the first problem is they cant get past the Thundermax to get it to even see the HU.
Thoughts? Suggestions? They did ask if I kept my old ECU which I did. They made a solid point that Id I ever needed to go into the bike for something I would be screwed without it.
Thanks in advance.
Monkey
2019 Street Glide Special stock HU
Arc Audio 600.4
BT-355 front and rear
Mmats 6.5f and 6x9r
Thundermax tuner
went to have the head unit flashed at a local HD dealer and they were super nice and said bring it in first thing Saturday and we will sneak you in. Great as we are full time RVers and cant get on someones schedule.
Well they took it right back and I saw them take off the left bag and side cover to access the port. I thought they would go into the back of the HU but told its all done through the ECU. When I saw the tech bring over another tech I knew it would not be a wham bam. The second tech came to me and asked what I had installed. Told him it was an ARC Audio amp. He said it wont work and the HU and stock ecu wont see a car audio amp. But the first problem is they cant get past the Thundermax to get it to even see the HU.
Thoughts? Suggestions? They did ask if I kept my old ECU which I did. They made a solid point that Id I ever needed to go into the bike for something I would be screwed without it.
Thanks in advance.
Monkey
Road Warrior
Joined: Feb 2016
Posts: 1,354
Likes: 399
From: Vancouver, BC
Nonsense. The HU nor ECU do not need to "see" the amp. You just want them to flash the HU with a Harley flash for no amps and 4 speakers with those BT355s. There are other flashes (such as Rockford Fosgate) used to flatten the EQ curve with different LoCs or DSPs but you don't want/need them when using the BT355. If the dealer can't figure it out using their Digital Technician you could go to an audio shop that has a TechnoResearch Centurion and get them to do it (Rockford Fosgate has a list of dealers that bought that flasher from them here).
You mention keeping the "stock ECU". Did you swap the ECM for some reason?
You mention keeping the "stock ECU". Did you swap the ECM for some reason?
Road Warrior
Joined: Feb 2016
Posts: 1,354
Likes: 399
From: Vancouver, BC
Ok, I reread your post and looked up the Thundermax and think I have a better understanding now. The Thundermax EFI module replaced the Harley ECM which is why the dealer was having trouble. I'd try putting the stock ECM back on the bike, get the HU flashed for no amps/4 speakers, and then put the Thundermax back on the bike. I think that should work but if not you might need to look at a different tuner that works with the stock ECM.
Last edited by hamah; Jul 24, 2021 at 08:38 PM.
Thread Starter
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Tourer
Joined: Jul 2012
Posts: 284
Likes: 12
From: Eugene, Or / Sammamish, WA
Ok, I reread your post and looked up the Thundermax and think I have a better understanding now. The Thundermax EFI module replaced the Harley ECM which is why the dealer was having trouble. I'd try putting the stock ECM back on the bike, get the HU flashed for no amps/4 speakers, and then put the Thundermax back on the bike. I think that should work but if not you might need to look at a different tuner that works with the stock ECM.
Road Master
Joined: Aug 2013
Posts: 1,083
Likes: 157
From: South Central Va
Yea the dealer is wrong about that. I haven't tried flashing one with a Thundermax, but the Techno Research tool does say it will not work with aftermarket ECU's.
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Tourer
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From: Eugene, Or / Sammamish, WA
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Road Warrior
Joined: Feb 2016
Posts: 1,354
Likes: 399
From: Vancouver, BC
Well thats a whole different conversation. Youd need to weigh the pros and cons to make a call.
For me I decided to stay with stock HU for control integration, weather proofing etc. If I was to swap out the GT it would be for the GTS but I cant justify the spend. Maybe if the GT dies on me one day.
I think you should put the stock ECM back on the bike, get it flashed by a different dealer or someone with the TR unit and then put your Thundermax back on. Its simple and cheap.
For me I decided to stay with stock HU for control integration, weather proofing etc. If I was to swap out the GT it would be for the GTS but I cant justify the spend. Maybe if the GT dies on me one day.
I think you should put the stock ECM back on the bike, get it flashed by a different dealer or someone with the TR unit and then put your Thundermax back on. Its simple and cheap.
Cruiser
Joined: Jan 2019
Posts: 177
Likes: 149
From: Las Vegas
that might be but I dont think Ill take it back to them as he was trying to say even if I had the stock ECU the HU would not see the amp (which I tried to nicely explain) The HU does not see it just flash 0 amp 4 speakers. And he said it still would not see the amp ( head slap). Im going to wait till Sturgis.
I am in process of changing my audio and bought the Techno Research Alaris tool to do my own flashes. But since I had Stage II Boom I first had to have the dealer remove that flash since the TR tool advises against flashing over a stage II flash.
When I took to dealer I asked them to flash it to either stock or 8/2. Tech came and got me and brought me back to bike and showed me on the screen that he didnt have those options enabled because it saw 1 amp. So I had to go with a 2 speaker/1 amp flash. Tech said at some point recently they updated all the Harley Tech tools, and it has removed his ability to flash stuff or make changes to things that are not installed or installed.
