TomV

My wiring diagram manual only covers 2019 MKZ and Fusion. I think there are two audio unit antenna options, if the car has a mast or a in rear glass antenna and the third is for Satellite . The extra chip in the Revel ACM is probably an external digital radio coprocessor for HD Radio. I can't fully read the NPX part numbers in your pictures, but if you post them I can research.

Yes, if there is an analog unit... that would be the one you need.

This is a picture of a Revel 14 speaker system. I believe that's the ACM behind the amp. Notice on the right the blue USB cable for digital audio that goes to the other side of the Revel amp. If your HD ACM doesn't have that USB plug, then it's probably not from a MKZ Revel system.

The Revel system ACM sends the audio signal to an amplifier over a blue USB cable and controls the amplifier volume over the CAN signals. The MKZ without Revel appears to have an internal amplifier in the ACM for mids/tweeters and separate amplifier for the two subs. I don't think the Revel system ACM is going to work for you because of the lack of amplification. One possible solution might be an iDatalink Maestro AR. I believe it connects to iDatalink-compatible Arc Audio, Audison and Kenwood amplifiers to the Revel System ACM using a USB data cable. You'd have to purchase the Maestro AR and an amplifier... but I'd call them first and explain your custom setup.

I actually reconnected the modem a few days ago, for future connectivity. Thankfully the prior "Master Reset" and no sign-in seems to be keeping the updates away.

Another point of interest. The Cellular Antenna is on the rear package tray, right near your passengers heads. Not much different than having a cellphone at your ear, but RF is blasting them unknowingly.

Well I’m finally done with updates! I pulled the power plug from the Modem (aka TCU aka Cellphone passport module). It is easy to access in the trunk, drivers side panel. You’ll notice the TCU with two coax antennas and the plug disconnected.

Disabling the TCU or ( Cellphone passport module) could have been as easy as pulling a 5A fuse #10, but unfortunately our cars also use that circuit for the power trunk and key pad. I might just disconnect the TCU ground to the chassis and see what happens.

Thanks guys for chiming in. I don’t pay for any cellular content. I never even enabled the Hotspot trial. My WiFi Is definitely off. My MKZ was built during the summer of 2019, so it might have newer APIM hardware for Sync. I don’t think they are pushing updates to older hardware.

I started a new thread, so members can continue to discuss v3.4 upgrade options here.

Got an email from the Master Reset.

Starting a new thread where I can rant about stopping automatic system updates of Sync 3.x My 2019 MKZ with Sync 3.3 continues to receive an update from Sync 3.3.19052 to Sync 3.4.20136. I disabled automatic system updates via WiFi and turned off Lincoln Connect connectivity features, but the update keeps coming. I would keep it a 3.4 if there were not major issues. 1). First I can't stand the different GUI and display background colors. 2). When listening to CD's, the steering wheel controls for next track, change the source back to FM. 3). My USB with .flac files can not browse by artist or album. It can only browse by explorer. 4). The audio gain has been reduced, now allowing the system to get as loud. Equalization may have also changed, but I can't confirm it. Fortunately I have a prior USB image that I can downgraded back to 3.3.19052 . I believe the modem is within the Telematic Control Unit (TUC), in the trunk on the driver side. I believe it might also control GPS, so I don't want to disconnect it and find I lost navigation too. My latest effort was to downgrade, then do a Sync 3 Master Reset. After the reset, I did not re-enable (SYNC Connect). I'm hoping this stops automatic system updates. Unfortunately, I don't get to use the Lincoln Way mobile app any longer. I'm probably going to submit a complaint to Lincoln, but doubt anything will come of it. I'm also going to look into Forscan as an option to disable the modem or disable all updates.

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NOTICE: Whatever the amplifiers are capable of, it appears Lincoln has lowered the audio gain in Sync 3.4 so they will no longer reach full potential! The volume scale goes 0 to 30. According to my ears, prior volumes of 15 seem to require around 20 to match the same level now. Equalization may have also changed. My guess is it's either an anomaly or they want to reduce the amount of warranty claims fir blown speakers.

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Nope, Lincoln Way downloads updates over LTE. See the information description below. I understand most people will be happy to receive automatic updates and security enhancements. The problem I have is the GUI sucks and they are forcing me to live with it at the expense of the Lincoln Way app.

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My 2019 MKZ with sync 3.3 automatically updated to 3.4 last week. It was probably connected to my WiFi with auto updates enabled. While some of you might like this news, I'm not crazy about 3.4. I don't think the screens or backgrounds look good. All the round touch buttons don't seem to match with a luxury car. I feel it's more "game" like now and I'm starting to wonder if I can change it back 3.3?

ForScan differences in ACM / Revel based on hardware level.

My buddies brand new 2019 Nautilus ended up with a completely dead battery a few months after he owned it. Wonder if Ford has a new supplier for their batteries?

Well that answers it. Thx!

I've seen a few pictures of MKZ's with an arch support in the trunk. Is this something earlier model years had or something the 3.0L AWD models come with for added chassis stiffness? My 2019 2.0L doesn't have it and I'm just curious.

Looks good! I probably wouldn't have done the rear reflectors... they are there for safety.

I'm happy to report the Clari-Fi feature really does help Satellite Radio sound much better. Harman has an interesting website that discusses this Clari-Fi technology.