Pinpoint Test J : The PAM (Parking Assist 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 PARKING AID for schematic and connector information.
Normal Operation and Fault Conditions

The PAM communicates on the HS-CAN2.

Possible Sources
- Fuse
- Wiring, terminals and connector
- PAM
Visual Inspection and Pre-checks
- Verify BCM fuse 8 (5A) is OK.

J1 CHECK THE PAM (PARKING ASSIST CONTROL MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: PAM C4226A.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4226A-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to J2

No	VERIFY BCM fuse 8 (5A) is OK. If OK, repair the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

J2 CHECK THE PAM (PARKING ASSIST CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4226A-20	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to J3

No	REPAIR the circuit.

J3 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE PAM (PARKING ASSIST CONTROL MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect GWM C2431.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4226A-9	Courtesy of FORD MOTOR COMPANY	C2431-18
C4226A-8	Courtesy of FORD MOTOR COMPANY	C2431-17

Are the resistances less than 3 ohms?

Yes

GO to J4

No	REPAIR the circuit in question.

J4 CHECK FOR CORRECT PAM (PARKING ASSIST CONTROL MODULE) OPERATION

Disconnect and inspect all the PAM 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 PAM 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, General Service Bulletin (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 PAM. REFER to: Parking Assist Control Module (PAM) .

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.