Pinpoint Test Ai : The BECMB (Battery Energy Control Module B) 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 MODULE COMMUNICATIONS NETWORK for schematic and connector information. Refer to SUPPLEMENTAL RESTRAINT SYSTEM for schematic and connector information.
Normal Operation and Fault Conditions

The BECMB communicates on the HS-CAN1.

Possible Sources
- Fuse
- Wiring, terminals and connector
- BECMB
Visual Inspection and Pre-checks
- Verify BCM fuses 10 (10A) and 15 (15A) are OK.

AI1 CHECK THE BECMB (BATTERY ENERGY CONTROL MODULE B) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Disconnect BECMB C2518.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2518-11	Courtesy of FORD MOTOR COMPANY	Ground
C2518-4	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to AI2

No	VERIFY BCM fuses 10 (10A) or 15 (15A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

AI2 CHECK THE BECMB (BATTERY ENERGY CONTROL MODULE B) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2518-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to AI3

No	REPAIR the circuit.

AI3 CHECK THE HS-CAN1 (HIGH-SPEED CONTROLLER AREA NETWORK 1) CIRCUITS BETWEEN THE BECMB (BATTERY ENERGY CONTROL MODULE B) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect GWM C2431.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2518-8	Courtesy of FORD MOTOR COMPANY	C2431-20
C2518-2	Courtesy of FORD MOTOR COMPANY	C2431-19

Are the resistances less than 3 ohms?

Yes

GO to AI4

No	REPAIR the circuit in question.

AI4 CHECK FOR CORRECT BECMB (BATTERY ENERGY CONTROL MODULE B) OPERATION

Ignition OFF.

Disconnect and inspect the BECMB 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 BECMB 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 the service article instructions. If no service articles address this concern, INSTALL a new BECMB. REFER to: Battery Energy Control Module B (BECMB) .

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.