2014 Ford Expedition hissing sound

Group using the FO1 and FO2 firmware for Ford SYNC retention * see specific firmware for full feature list.
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sergey.bashmakov
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2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

I have 2014 Ford Expedition Nav/Sync/oem amp + Maestro RR/Kenwood DMX906S/HRN-RR-FO1

I've installed everything as from the instruction https://images.idatalink.com/corporate/ ... 191029.pdf
After installation no matter what front twitters produce hissing sound constantly even if the volume is low or muted completely.
Another thing is that on the lowest volume setting the sound is pretty high, looks like something is not working as expected in the oem amplifier.

Can it be fixed without replacing oem amplifier? Any thoughts / suggestions?

Thanks in advance,
Sergey

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Dara DeGrand
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Re: 2014 Ford Expedition hissing sound

Post by Dara DeGrand »

Sergey, if you're experiencing hissing, the audio level going into the OEM Amplifier is too high. To fix this, I recommend putting the RCAs (mentioned in step 1) back on and using them instead.
Dara DeGrand
Maestro Technical Support Manager
Automotive Data Solutions Inc.
8400 Bougainville, QC
T 514.807.2888
TF 866.427.2999

sergey.bashmakov
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Re: 2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

Thanks Dara!
Am I correct that the top row of rca's on the main unit is for the rear, middle for front and bottom for subs, that in case if there is 2-way speaker system selected?

Would be great if described in the installation guide for Maestro RR and the harness, could save a day :)
Last edited by sergey.bashmakov on Mon Feb 10, 2020 6:26 pm, edited 1 time in total.

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Zack Flynn
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Re: 2014 Ford Expedition hissing sound

Post by Zack Flynn »

Looking at an image of the rear of the radio online it looks like it goes from top to bottom, rear on top, front in the middle, then sub on the bottom. You may want to view the kenwood manual or look closely at the chassis of your radio to be sure this is the same layout.
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sergey.bashmakov
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Re: 2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

Thank you Zack!

There are couple more questions:
- is it possible to retain factory backup camera or I have to install a new one?
- there are different versions of firmware available for MRR , v3.7 is recommended but there is another v3.8 where can I see the difference between these versions? Are there some release notes somewhere?

fastestneon
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Re: 2014 Ford Expedition hissing sound

Post by fastestneon »

Maestro RR does not retain backup camera in this application.. But if you have some basic splicing knowledge.. You can splice an RCA in the factory line behind the radio and plug that into your camera input of the aftermarket radio.
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sergey.bashmakov
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Re: 2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

Thank you, do you know by any chance the wires color code for factory camera?

sergey.bashmakov
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Re: 2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

That works now but I got another issue battery drains in 4-5 days completely, where should I start with this?

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Dara DeGrand
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Re: 2014 Ford Expedition hissing sound

Post by Dara DeGrand »

You should start with a proper current draw test. That should help to identify where there is excess current draw. We have had this solution out for about 8 years now, so all the firmware kinks have been worked out. There might be an issue with wiring or hardware causing the issue, so a current draw test should help point you in the right direction.
Dara DeGrand
Maestro Technical Support Manager
Automotive Data Solutions Inc.
8400 Bougainville, QC
T 514.807.2888
TF 866.427.2999

sergey.bashmakov
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Re: 2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

Just tested and maestro causing it, without mestro connected current draw is 0.01A-0.05A, once maestro is connected the constant current draw increasing to ~0.3A and each 44 seconds it starts blinking red led and the current increasing up to 1.2A!
I removed fuses for sync, amplifier, subwoofer, while radio fuse was in places and still had this issue. I disconnected harness from the receiver and still the problem was there. Then I disconnected one of the connectors ("A" which is next to the red connection socket) from mestro and in 20-30 sec the current went down to 0.02-0.05 . I saw that maestro was blinking red but the current was the same low. I have pictures and video.

sergey.bashmakov
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Re: 2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

Any suggestions what shall I do?

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Dara DeGrand
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Re: 2014 Ford Expedition hissing sound

Post by Dara DeGrand »

The plug next to the red connector is the data. If there is anything else in the vehicle that is waking the truck's data lines up, we will wake up too, preparing to turn on when we see the key signal. There could be something else in the vehicle unrelated to the radio circuitry that is causing the data lines to wake up, which makes us wake up, and causes excess draw.
Dara DeGrand
Maestro Technical Support Manager
Automotive Data Solutions Inc.
8400 Bougainville, QC
T 514.807.2888
TF 866.427.2999

sergey.bashmakov
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Re: 2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

How can it be fixed? I'm not sure that this is the right behavior and it doe not look like it should work that way. I just got my battery dead and can not charge it again, at least with my charger, it means I need new battery which is $100 because the device is waking up when it should not :(

Is there a wiring diagram for data connector that I could at least try to trace?

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Dara DeGrand
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Re: 2014 Ford Expedition hissing sound

Post by Dara DeGrand »

We are connected to 2 data networks that go to the 18 pin plug. The OBD2 (yellow/brown and red/brown) and the data behind the radio, MS can (brown/red and brown/yellow). You could first try unplugging the OBD2 to see if the draw goes away. If not, something on MS can is waking up.
Dara DeGrand
Maestro Technical Support Manager
Automotive Data Solutions Inc.
8400 Bougainville, QC
T 514.807.2888
TF 866.427.2999

sergey.bashmakov
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Re: 2014 Ford Expedition hissing sound

Post by sergey.bashmakov »

Thanks for the update
I tried to disconnect OBD2 and it does not affect the waking up periods.
Then I was trying to pull out fuses one by one and found out that without the fuse for a dash console it drains about 0.5A less but still I see the "wake up" pattern, so the current goes from 0.3A to ~0.6A not to 1.2A.
I had a v3.8 firmware and just yesterday flashed to v3.7 so now the "wake up" pattern does not appear but drawing is still between 0.25 and 0.3, which is better but not that which would give me peace in mind :)

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