Pinpoint Test R: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Diagnostic Scan Tool

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

Refer to Module Communications Network for schematic and connector information. Refer to Audio System/Navigation for schematic and connector information.
Normal Operation and Fault Conditions

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

Possible Sources
- Fuse
- Wiring, terminals and connector
- APIM
Visual Inspection and Pre-checks
- Verify BCM fuse 32 (10A) is OK.

R1 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 R2

No	VERIFY the BCM fuse 32 (10A) is OK. If OK, REPAIR the circuit. If not OK, refer to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

R2 CHECK THE APIM (SYNC MODULE) GROUND CIRCUITS 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 R3

No	REPAIR the circuit.

R3 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	C2431-18
C2383A-54	Courtesy of FORD MOTOR COMPANY	C2431-19

Are the resistances less than 3 ohms?

Yes

GO to R4

No	REPAIR the circuit in question.

R4 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

Disconnect GWM C2431

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

GO to R5

No	REPAIR the circuit in question.

R5 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	CONNECT the GWM, GO to R6

No	REPAIR the circuit in question.

R6 CHECK FOR CORRECT APIM (SYNC MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the APIM connector.

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 connector. Make sure it seats and latches 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, GSB, SSM or FSA If a service article exists for this concern, DISCONTINUE this test and FOLLOW 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.