PINPOINT TEST F : The BCM Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2016 Ford Expedition. 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 .

F1 CHECK THE HS-CAN TERMINATION RESISTANCE

Ignition OFF.

Disconnect the diagnostic scan tool cable from the DLC.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C251-6	Courtesy of FORD MOTOR COMPANY	C251-14

Is the resistance between 54 and 66 ohms?

Yes	GO to F3.
No	GO to F2.

F2 CHECK THE HS-CAN CIRCUITS BETWEEN THE BCM AND THE DLC FOR AN OPEN

Disconnect: BCM C2280F .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280F-16	Courtesy of FORD MOTOR COMPANY	C251-6
C2280F-17	Courtesy of FORD MOTOR COMPANY	C251-14

Are the resistances less than 3 ohms?

Yes	GO to F7.
No	REPAIR the circuit in question.

F3 CHECK THE MS-CAN TERMINATION RESISTANCE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C251-3	Courtesy of FORD MOTOR COMPANY	C251-11

Is the resistance between 54 and 66 ohms?

Yes	GO to F5.
No	GO to F4.

F4 CHECK THE MS-CAN CIRCUITS BETWEEN THE BCM AND THE DLC FOR AN OPEN

Disconnect: BCM C2280B .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280B-38	Courtesy of FORD MOTOR COMPANY	C251-3
C2280B-39	Courtesy of FORD MOTOR COMPANY	C251-11

Are the resistances less than 3 ohms?

Yes	GO to F7.
No	REPAIR the circuit in question.

F5 CHECK BCM VOLTAGE SUPPLY

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280G-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to F6.
No	REPAIR the circuit. REFER to the OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

F6 CHECK THE BCM GROUND CIRCUIT FOR AN OPEN

Disconnect: BCM C2280D .

Disconnect: Negative Battery Cable.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280D-16	Courtesy of FORD MOTOR COMPANY	Ground
C2280D-25	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	GO to F7.
No	REPAIR the circuit.

F7 CHECK FOR CORRECT BCM OPERATION

Ignition OFF.

Disconnect and inspect the BCM connectors and related in-line connectors.

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

Reconnect the BCM connectors and related in-line connectors. Make sure they seat and latch 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. Concern may have been caused by a loose or corroded connector.