Pinpoint Test Ab : The GSM (Gear Shift 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 Transmission Controls - TR9070 for schematic and connector information. Refer to Shift Interlock for schematic and connector information.
Normal Operation and Fault Conditions

The GSM communicates on the HS-CAN2.

Possible Sources
- Fuse
- Wiring, terminals and connector
- GSM
Visual Inspection and Pre-checks
- Verify BCM fuse 12 (7.5A) is OK.

AB1 CHECK THE GSM (GEAR SHIFT MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: GSM C2532.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2532-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to AB2

No	VERIFY BCM fuse 12 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Introduction to identify the possible causes of the circuit short.

AB2 CHECK THE GSM (GEAR SHIFT MODULE) GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2532-9	Courtesy of FORD MOTOR COMPANY	Ground
C2532-18	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to AB3

No	REPAIR the circuit in question.

AB3 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE GSM (GEAR SHIFT MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect GWM C2431.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2532-3	Courtesy of FORD MOTOR COMPANY	C2431-18
C2532-2	Courtesy of FORD MOTOR COMPANY	C2431-17

Are the resistances less than 3 ohms?

Yes

GO to AB4

No	REPAIR the circuit in question.

AB4 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the GSM 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 GSM 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 GSM. REFER to: Gear Shift Module (GSM) .

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.