Pinpoint Test C : The BCM Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2016 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.

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

C1 CHECK THE HS-CAN TERMINATION RESISTANCE

Ignition OFF.

Disconnect: Negative Battery Cable.

Disconnect the scan tool cable from the Data Link Connector (DLC).

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C251-6	VDB04 (WH/BU)	C251-14	VDB05 (WH)

Courtesy of FORD MOTOR COMPANY

Is the resistance between 54 and 66 ohms?

Yes	GO to C3
No	GO to C2.

C2 CHECK THE HS-CAN CIRCUITS BETWEEN THE BCM AND THE DLC FOR AN OPEN

Disconnect: BCM C2280F .

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C2280F-16	VDB04 (WH/BU)	C251-6	VDB04 (WH/BU)
C2280F-17	VDB05 (WH)	C251-14	VDB05 (WH)

Courtesy of FORD MOTOR COMPANY

Are the resistances less than 3 ohms?

Yes	GO to C7.
No	REPAIR the circuit in question.

C3 CHECK THE MS-CAN TERMINATION RESISTANCE

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C251-3	VDB06 (GY/OG)	C251-11	VDB07 (VT/OG)

Courtesy of FORD MOTOR COMPANY

Is the resistance between 54 and 66 ohms?

Yes	GO to C5.
No	GO to C4.

C4 CHECK THE MS-CAN CIRCUITS BETWEEN THE BCM AND THE DLC FOR AN OPEN

Disconnect: BCM C2280B .

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C2280B-38	VDB06 (GY)	C251-3	VDB06 (GY/OG)
C2280B-39	VDB07 (VT)	C251-11	VDB07 (VT/OG)

Courtesy of FORD MOTOR COMPANY

Are the resistances less than 3 ohms?

Yes	GO to C7.
No	REPAIR the circuit in question.

C5 CHECK THE BCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

NOTE: Measurements are taken with the fuse installed and probes placed at the terminals on the back of the fuse blade.

Disconnect: BCM C2280G .

Ignition ON.

Measure the voltage between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C2280G-1	SBF16 (RD)	-	Ground

Courtesy of FORD MOTOR COMPANY

Is the voltage greater than 11 volts on both sides of the fuse?

Yes	GO to C6.
No	VERIFY the MEGA fuse 1 (100A) is OK. If OK, GO to C3. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

C6 CHECK THE BCM GROUND CIRCUIT FOR AN OPEN

Disconnect: BCM C2280D .

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C2280D-16	GD233 (BK)	-	Ground
C2280D-25	GD233 (BK)	-	Ground

Courtesy of FORD MOTOR COMPANY

Is the resistance less than 3 ohms?

Yes	GO to C7.
No	REPAIR the circuit in question.

C7 CHECK FOR CORRECT BCM OPERATION

Disconnect all the BCM 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 BCM connectors and make sure they are seated 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, Refer to BCM HARDWARE TESTING .
No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.