Pinpoint Test U : The HUD (Head Up Display) Module Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2020 Ford Mustang. 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 Emergency Messaging System for schematic and connector information.
Normal Operation and Fault Conditions

The HUD module communicates on the HS-CAN2.

Possible Sources
- Fuse
- Wiring, terminals and connector
- HUD
Visual Inspection and Pre-checks
- Verify BCM fuse 66 (5A) is OK.

U1 CHECK THE HUD (HEAD UP DISPLAY) MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: HUD module C2395.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2395-4	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to U2

No	VERIFY BJB fuse 66 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Introduction to identify the possible causes of the circuit short.

U2 CHECK THE HUD (HEAD UP DISPLAY) MODULE GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2395-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to U3

No	REPAIR the circuit.

U3 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE HUD (HEAD UP DISPLAY) MODULE AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect: GWM C2431.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2395-3	Courtesy of FORD MOTOR COMPANY	C2431-18
C2395-2	Courtesy of FORD MOTOR COMPANY	C2431-17

Are the resistances less than 3 ohms?

Yes

GO to U4

No	REPAIR the circuit in question.

U4 CHECK FOR CORRECT HUD (HEAD UP DISPLAY) MODULE OPERATION

Ignition OFF.

Disconnect and inspect the HUD module 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 HUD module 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, 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 HUD module. REFER to: Head Up Display (HUD) Module .

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.