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

WARNING: This page is about a different car, the 2020 Ford Transit Connect. 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 on the HS-CAN2. REFER to: Communications Network - System Operation and Component Description .

Possible Sources
- Fuse
- Wiring, terminals and connector
- OCSM
Visual Inspection and Pre-checks
- Verify BCM fuse 10 (10A) and fuse 15 (10A) are OK.

K1 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 K2

No GO to Pinpoint Test B

K2 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 BECMB Diagnostic Trouble Codes (DTCs). REFER to: Airbag Supplemental Restraint System (SRS) .

No GO to K3

K3 CHECK THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

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 K4

No	VERIFY BCM fuse 10 (10A) and 15 (10A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

K4 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 K5

No	REPAIR the circuit.

K5 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	C2431-18
C3285-3	Courtesy of FORD MOTOR COMPANY	C2431-17

Are the resistances less than 3 ohms?

Yes	CONNECT the GWM, GO to K6

No	REPAIR the circuit in question.

K6 CHECK FOR CORRECT OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all the OCSM 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 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new OCSM. REFER to Supplemental Restraint System article.

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.