Pinpoint Test N : The ACM Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2015 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables .

N1 CHECK THE I-CAN TERMINATION RESISTANCE

Ignition OFF.

Disconnect: Negative Battery Cable.

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C251-1	VDB13 (BU/GY)	C251-9	VDB14 (VT/GY)

Courtesy of FORD MOTOR COMPANY

Is the resistance between 54 and 66 ohms?

Yes	GO to N3.
No	GO to N2.

N2 CHECK THE I-CAN CIRCUITS BETWEEN THE ACM AND THE DLC FOR AN OPEN

Disconnect: IPC C240A .

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C240A-14	VDB13 (BU)	C251-1	VDB13 (BU/GY)
C240A-15	VDB14 (VT)	C251-9	VDB14 (VT/GY)

Courtesy of FORD MOTOR COMPANY

Are the resistances less than 3 ohms?

Yes	GO to N3.
No	REPAIR the circuit in question.

N3 CHECK THE ACM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: ACM C240A .

Ignition ON.

Measure the voltage between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C240A-1	SBP29 (GY/RD)	-	Ground

Courtesy of FORD MOTOR COMPANY

Is the voltage greater than 11 volts?

Yes	GO to N4.
No	VERIFY the Body Control Module (BCM) fuse 29 (20A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM WIRING DIAGRAMS to identify the possible causes of the circuit short.

N4 CHECK THE ACM GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: Negative Battery Cable.

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C240A-13	GD374 (BK/WH)	-	Ground

Courtesy of FORD MOTOR COMPANY

Is the resistance less than 3 ohms?

Yes	GO to N5.
No	REPAIR the circuit in question.

N5 CHECK FOR CORRECT ACM OPERATION

Disconnect all the ACM connectors.

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

Connect all the ACM connectors and make sure they seat correctly.

Operate the system and verify the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs address this concern, INSTALL a new ACM. REFER to Information and Entertainment Systems - 8-Inch (203 mm) Touchscreen, 8 Speakers or Information and Entertainment Systems - THX 8-Inch (203 mm) Touchscreen, 14 Speakers .
No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.