Pinpoint Test Q : The APIM (Sync Module) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2020 Lincoln Corsair. However, it is still accessible from the selected car via links, so may be relevant.

Refer to POWER DISTRIBUTION/BCM for schematic and connector information. Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information. Refer to AUDIO SYSTEM/NAVIGATION - SYNC for schematic and connector information. Refer to AUDIO SYSTEM/NAVIGATION - WITH HARMAN REVEL for schematic and connector information.
Normal Operation and Fault Conditions

The APIM communicates on the HS-CAN1, HS-CAN3 and HS-CAN4.

Possible Sources
- Fuse
- Wiring, terminals and connector
- APIM
Visual Inspection and Pre-checks
- Verify BCM fuse 17 (15A) is OK.

Q1 CHECK THE APIM (SYNC MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: APIM C2383A.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2383A-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to Q2

No	VERIFY BCM fuse 17 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

Q2 CHECK THE APIM (SYNC MODULE) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2383A-37	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to Q3

No	REPAIR the circuit.

Q3 CHECK THE HS-CAN1 (HIGH-SPEED CONTROLLER AREA NETWORK 1) CIRCUITS BETWEEN THE APIM (SYNC MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect GWM C2431.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2383A-53	Courtesy of FORD MOTOR COMPANY	C2431-20
C2383A-54	Courtesy of FORD MOTOR COMPANY	C2431-19

Are the resistances less than 3 ohms?

Yes

GO to Q4

No	REPAIR the circuit in question.

Q4 CHECK THE HS-CAN3 (HIGH-SPEED CONTROLLER AREA NETWORK 3) CIRCUITS BETWEEN THE APIM (SYNC MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2383A-19	Courtesy of FORD MOTOR COMPANY	C2431-16
C2383A-20	Courtesy of FORD MOTOR COMPANY	C2431-15

Are the resistances less than 3 ohms?

Yes	If equipped with a TCU, GO to Q5 If not equipped with a TCU, GO to Q6

No	REPAIR the circuit in question.

Q5 CHECK THE HS-CAN4 (HIGH-SPEED CONTROLLER AREA NETWORK 4) CIRCUITS BETWEEN THE APIM (SYNC MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2383A-41	Courtesy of FORD MOTOR COMPANY	C2431-7
C2383A-42	Courtesy of FORD MOTOR COMPANY	C2431-6

Are the resistances less than 3 ohms?

Yes

GO to Q6

No	REPAIR the circuit in question.

Q6 CHECK FOR CORRECT APIM (SYNC MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all the APIM connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the APIM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, General Service Bulletin (GSB), SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, Refer to APIM Guided Routine Testing .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.