Pinpoint Test AJ : The VDM (Vehicle Dynamics Control Module) 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 Vehicle Dynamic Systems for schematic and connector information.
Normal Operation and Fault Conditions

The VDM communicates on the HS-CAN2.

Possible Sources
- Fuse
- Wiring, terminals and connector
- VDM
Visual Inspection and Pre-checks
- Verify BCM fuse 16 (15A) is OK.

AJ1 CHECK THE VDM (VEHICLE DYNAMICS CONTROL MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: VDM C4396A.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4396A-1	Courtesy of FORD MOTOR COMPANY	Ground
C4396A-2	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to AJ2

No	VERIFY BCM fuse 16 (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.

AJ2 CHECK THE VDM (VEHICLE DYNAMICS CONTROL MODULE) GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4396A-11	Courtesy of FORD MOTOR COMPANY	Ground
C4396A-12	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes

GO to AJ3

No	REPAIR the circuit in question.

AJ3 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE VDM (VEHICLE DYNAMICS CONTROL MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect GWM C2431.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4396A-3	Courtesy of FORD MOTOR COMPANY	C2431-18
C4396A-13	Courtesy of FORD MOTOR COMPANY	C2431-17

Are the resistances less than 3 ohms?

Yes

GO to AJ4

No	REPAIR the circuit in question.

AJ4 CHECK FOR CORRECT VDM (VEHICLE DYNAMICS CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the VDM connectors.

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 VDM connectors. Make sure they seat and latch 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 VDM. REFER to: Vehicle Dynamics Control Module (VDM) .

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.