A/C compressor not engaging after SYNC 3.0 → 3.4 APIM replacement

Ford SYNC 3 Support CyanLabs Update Support
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1

Hi everyone,
I replaced my SYNC 3 APIM in a 2017 Ford Kuga (1.5 EcoBoost) with a unit sourced from Singapore.
After replacing the APIM, the A/C compressor does not engage.
All components were checked by an electrician: relay, compressor, wiring and pressure sensors are OK.
If the relay is manually bridged, the compressor starts and the A/C works normally.

When pressing the A/C button, the compressor does not receive the command from the control unit.
Interestingly, when I toggle the A/C via FORScan, the button behavior is reversed (OFF shows ON and vice versa).
VIN: WF0AXXWPMAHB62548

Engine: 1.5 EcoBoost

Trim: Business

The car is a Ford Kuga 2017 with automatic climate control controlled by physical buttons (not via the SYNC screen).

I would really appreciate any help or suggestions, as I have been troubleshooting this issue for quite a long time without success.
I’ve attached current APIM As-Built configuration.

;Block 1
7D0G1G10968459290B1
7D0G1G202BC1B0002B5
;Block 2
7D0G2G14C4F010440BA
7D0G2G2024800000025
7D0G2G30005E1
;Block 3
7D0G3G10400010000E0
;Block 4
7D0G4G101001C00251E
7D0G4G20001DE
;Block 5
7D0G5G118061810294C
7D0G5G25F3D
;Block 6
7D0G6G1805E
;Block 7
7D0G7G117043300002D
7D0G7G2000000FA00DA
7D0G7G300043075008A
7D0G7G45739

SYNC Region: EU

Navigation Variant: Nav

Manufacturer Year: Pre MY20

Install Type: Replica

Old SYNC Version: 3.0

New SYNC Version: 3.4

Do you have a error message, if so what is it?
U3000:41:0B

Update Method: CyanLabs Manual Method

2

APIM has nothing to do with the A/C other than the software based buttons. Did you replace anything other than the APIM?

Depending on your configuration the HVAC module or the FCIM are the only things that would effect the A/C.

3

Did you reload your factory AB into the unit or did you trust the seller to do it?

4

Thank You.

No, I did not replace anything else. Only the APIM unit was replaced.

The A/C panel (FCIM) and HVAC module are original.

The interesting thing is that when I toggle A/C via FORScan, the state appears reversed (OFF shows ON and vice versa).

Also, if I manually bridge the A/C relay, the compressor engages and the system cools normally.

That is why I suspect some configuration or CAN communication issue rather than a hardware fault.

5

Yes, I loaded the factory As-Built configuration from Motorcraft using my VIN (WF0AXXWPMAHB62548) and programmed it with FORScan.

So the APIM should now have the correct As-Built configuration for my vehicle.

However, the A/C compressor still does not engage after the APIM replacement.

6

Do you have access to a scope to check to see if the relay is getting the signals to activate?

7

When the APIM still had the As-Built configuration from the donor vehicle (Singapore), the touch climate controls appeared on the SYNC screen. However, the behavior was reversed and the A/C compressor would not engage. In FORScan the parameter showed AC REQ = NO even when A/C was requested.

After that I programmed the APIM with the factory As-Built configuration from Motorcraft using my VIN (WF0AXXWPMAHB62548). After loading the correct VIN configuration the touch climate controls disappeared (which is correct for my vehicle because the climate is controlled by physical buttons), but now neither the touch controls nor the physical A/C button will engage the compressor.

Unfortunately I do not have access to an oscilloscope. However, the relay and compressor were tested by an electrician. If the relay contacts are bridged manually, the compressor engages and the A/C system cools normally. This suggests the relay, compressor and wiring are OK, but the control module is not sending the activation signal.

8

When the APIM still had the As-Built configuration from the donor vehicle (Singapore), the touch climate controls appeared on the SYNC screen. However, the behavior was reversed and the A/C compressor would not engage. In FORScan the parameter showed AC REQ = NO even when A/C was requested.

After that I programmed the APIM with the factory As-Built configuration from Motorcraft using my VIN (WF0AXXWPMAHB62548). After loading the correct VIN configuration the touch climate controls disappeared (which is correct for my vehicle because the climate is controlled by physical buttons), but now neither the touch controls nor the physical A/C button will engage the compressor.

Unfortunately I do not have access to an oscilloscope. However, the relay and compressor were tested by an electrician. If the relay contacts are bridged manually, the compressor engages and the A/C system cools normally. This suggests the relay, compressor and wiring are OK, but the control module is not sending the activation signal.

9

Bridging the relay tells me the compressor works but it does not tell me if the relay works. We need to know if the relay coil is being energized and if it is, does it activate the relay.

What happened to your original SYNC3 that you had to replace it?

11

My original SYNC 3 APIM was not faulty originally. I unfortunately bricked it while attempting a software upgrade from SYNC 3.0 to SYNC 3.4. After that the screen went black and the unit became unusable, so I replaced the APIM with another unit sourced from Singapore.

Regarding the relay: the relay and compressor were checked by an electrician and the compressor works when the relay contacts are bridged manually.

However, when the A/C button is pressed, the relay coil does not appear to receive the activation signal.

Also when monitoring HVAC data in FORScan, the parameter AC Request does not change when the A/C button is pressed.

12

Do you have single or dual zone HVAC? Check your asbuilt…

7D0-04-01 xxxx xxXX xx–
0100 1C00 251E

This sets Automatic Dual Zone, do you have Manual controls?

Your OEM asbuilt indicates you do have automatic dual controls…but you have discrepancies in both asbuilts at 7D0-04-01 and 7D0-02-02. These need to align…
0100 1C01 251F

7D0-01-01 	0968 	4592 	90B1 
7D0-01-02 	02BC 	1700 	02B1 
7D0-02-01 	4C4F 	0104 	40BA 
7D0-02-02 	0248 	0000 	0025 
7D0-02-03 	0005 	E1 	 
7D0-03-01 	0400 	0100 	00E0 
7D0-04-01 	0100 	1C01 	251F 
7D0-04-02 	0001 	DE 	 
7D0-05-01 	1806 	1810 	294C 
7D0-05-02 	5F3D 	 	 
7D0-06-01 	805E 	 	 
7D0-07-01 	1704 	3300 	002D 
7D0-07-02 	0000 	00FA 	00DA 
7D0-07-03 	0004 	3075 	008A 
7D0-07-04 	5739
13

Thank You.

I already tried changing those configuration values based on AI suggestions. I switched them from manual climate control to automatic dual zone climate control and back again, but it made no difference. Unfortunately the A/C behavior is still the same and the compressor still does not engage.