Sync 4 Retrofit in 2015 F-150 - A/C Issue

Ford Non SYNC 3 Support
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Hey everyone, working through a tricky Sync 4 retrofit on my 2015 F-150 and running into a brick wall with an MS-CAN network crash and lost A/C control. Hoping someone here has dealt with this architecture clash.

The Setup:

  • Vehicle: 2015 Ford F-150 (CGEA 1.2 architecture) originally with manual single-zone climate.

  • Upgrade: Sync 4 APIM, screen, and a 2022+ OEM manual single-zone climate FCIM with heated seats (bought as an eBay kit).

The Core Problem: With the MS-CAN wires (pins 16 and 17) disconnected, the screen boots, blower speed/vents work locally, and power windows/locks operate normally. However, the A/C button does nothing (no LED, no compressor).

As soon as I plug pins 16 and 17 back in to restore network communication, the MS-CAN bus crashes immediately—power windows and door locks stop working, and the cluster throws communication errors.

What I’ve Found So Far:

  • It’s not a physical short; it’s an architecture conflict. The 2015 truck is CGEA 1.2, while the 2022 APIM is pushing CGEA 1.3 / FNV2 data packets that the 2015 Gateway/BCM rejects into a “Bus Off” state.

  • Pulling FORScan As-Built data from the APIM shows 7D0-08-01 currently reads C000 0001, meaning it’s trying to talk to 2022-native digital HVAC modules that don’t exist in my 2015.

My Planned Fix / As-Built Changes: I’m about to use FORScan to adjust the following:

  1. Master Architecture (7D0-01-01 / 7D0-01-03): Need to verify if the vendor left it set to CGEA 1.3/FNV2 and force it back to CGEA 1.2 language so the 2015 BCM can understand it.

  2. Gateway Routing (7D0-08-01): Zeroing out the advanced routing block (0000 0000 00E0) to stop it from spamming non-existent 2022 modules.

  3. Climate Control Type (7D0-01-02): Ensuring it’s set to manual single-zone (2) so it recognizes the physical FCIM button inputs instead of looking for automatic dual-zone data.

Questions for the Community:

  • Has anyone successfully bridged a 2022 manual FCIM onto a 2015 CGEA 1.2 bus?

  • Are there hidden gateway hurdles or firmware blocks between a 2022 APIM and a 2015 BCM that keep them from sharing MS-CAN cleanly, or is this purely an As-Built mapping mismatch?

Any advice or known working As-Built strings for this specific cross-generation manual setup would be massively appreciated.

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Sync4 is usually HS4 and I believe the 2015 is an HS3 vehicle.