The first question: What Sync version is in the APIM on your 2016 Lincoln MKX? What is the part number of the APIM? Is this modem equipped with wireless hotspot? Do you plan on using the hotspot? The answers to these questions will determine if this modem will even work for you.
I read the thread you attached. There are probably features and functions of his TCU that are not correct or not working…unless he did not post all of the steps and information in the thread. First thing: the JA1T-14G229-AJ is a different modem than the KT1T you are using. It is possible to use the KT1T modem in your 2016 MKX, but you have the wrong Calibration Level in the TCU. The Calibration and Strategy files will need to be changed, reprogrammed, then the asbuilt will need to be adjusted for your vehicle. The TCU is presently calibrated for HS4-CAN, your vehicle does not support this, and the JX7T Strategy file will not work with a 2016 vehicle at all. Also, it is possible that your APIM will not support this TCU, especially if the APIM is a G-series. The G-series APIM will not support the hotspot, and some other features of the TCU.
This TCU shows it is in “Authorized Mode”, which is probably left over from the last vehicle it was installed in, which would be a 2019 Lincoln based on the part number. That TCU is still tied to that VIN in the FordPass system. To use this TCU, you will need to disassociate the TCU and the donor vehicle.
To solve these issues, you must downgrade the TCU firmware to:
Calibration Level: JL3T-14G087-CR, -CS, or CT
Strategy: JL3T-14G139-Cx
ECU Config: JL3T-14G144-Cx
Then, you will need to make the appropriate adjustments to the APIM, BCM, IPC.
APIM, Sync 3.2+:
Instruct the APIM there is a TCU.
7D0-02-02 xxxx *xxx xxxx, from 8 to 9.
Instruct the APIM that the TCU is hotspot capable, if so equipped.
7D0-02-03 *xxx, from 0 to 4.
BCM:
Vehicle must be equipped with and programmed for factory remote start.
Enable Remote Start:
726-22-02: xxx1 xxxx xxxx
Remote Start: 0=disabled, 1=enabled
Tracking and Blocking Module (TBM)
726-49-01 x*xxx xxxx xxxx
TBM Avail Cfg: 0=absent, 1=present
IPC:
Adds Remote Start menu to instrument cluster.
720-02-02: xxxx Axxx
TCU:
Load a new asbuilt into the TCU that is compatible with your vehicle.
Once the adjustments above are completed and the firmware has been downgraded, the APIM should have communications with the TCU. If it does not, the authorization will not work.
You will then need to unregister the modem on the FordPass system. This will require wiping the TCU registration with the previous vehicle and registering the unit to your vehicle. This will require the use of FordPass on your phone paired to your vehicle, and FORScan. Keep in mind that whenever you are working with the TCU changing parameters in the asbuilt for registration that the vehicle must be running, engine on. I can see that the pics above indicate the engine is off.
There is a specific procedure to follow once all of the requirements and adjustments above are completed to authorize the TCU for your vehicle.