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.
Zack Flynn
Automotive Data Solutions
Technical Support & MECP Master Installation Technician
Zachary.flynn@adsdata.ca

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.
Jeffrey
Lead Installer
Best Buy

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?

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