Pinpoint Test E : The Occupant Classification System Module (OCSM) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2019 Ford Ranger. 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 OCSM communicates with the diagnostic scan tool through the HS-CAN2.

Possible Sources
- Fuse
- Wiring, terminals and connectors
- OCSM
Visual Inspection and Pre-checks
- Verify BCM fuses 14 (10A) and 19 (7.5A) are OK.

E1 CHECK FOR BECMB (BATTERY ENERGY CONTROL MODULE B) NETWORK COMMUNICATION
- Ignition ON.
- Using a diagnostic scan tool, perform the network test.
Does the BECMB pass the network test?

Yes GO to E2

No DIAGNOSE a module communication concern. GO to Pinpoint Test D

E2 RETRIEVE RECORDED BECMB (BATTERY ENERGY CONTROL MODULE B) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, perform a BECMB self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes DIAGNOSE the Diagnostic Trouble Codes (DTCs). REFER to: Airbag Supplemental Restraint System (SRS) .

No GO to E3

E3 CHECK THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Wait one minute.

Disconnect: OCSM C3285.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3285-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to E4

No	VERIFY BCM fuses 14 (10A) and 19 (7.5A) are OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

E4 CHECK THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3285-4	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to E5

No	REPAIR the circuit.

E5 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect GWM C2431.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3285-2	Courtesy of FORD MOTOR COMPANY	C2341-18
C3285-3	Courtesy of FORD MOTOR COMPANY	C2431-17

Are the resistances less than 3 ohms?

Yes

GO to E6

No	REPAIR the circuit in question.

E6 CHECK FOR CORRECT OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the OCSM connector and related in-line 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 OCSM connector and related in-line 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 OCSM. REFER to: Occupant Classification System (OCS) Sensor .

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.