Pinpoint Test Be: B0061:11, B0061:12, B0061:13 And B0061:64

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Wiring Diagrams SUPPLEMENTAL RESTRAINT SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Airbag and Seatbelt Pretensioner Supplemental Restraint System (SRS) - System Operation and Component Description .

The Belt Tension Sensor (BTS) operates in conjunction with the OCS. The OCS interprets a variable voltage signal provided by the Belt Tension Sensor (BTS) to identify the possible presence of a child safety seat in the front passenger seat. The voltage output of the Belt Tension Sensor (BTS) is proportional to the amount of tension applied to the sensor by the belt: no belt tension causes a low voltage (approximately 0.95 volt) to be output and high belt tension causes a high voltage (approximately 3.8 volts) to be returned to the OCSM.

The OCSM monitors the Belt Tension Sensor (BTS) and related circuits for the following faults:

Resistance out of range
Unexpected voltage
Short to ground
Faulted Belt Tension Sensor (BTS) (part of the front passenger seatbelt buckle)

If a fault is detected, the OCSM stores DTC B0061:11, B0061:12, B0061:13 or B0061:64 in memory and sends a message to the RCM over the HS-CAN2 indicating that an OCS fault is present. Upon receipt of this message, the RCM sets DTC B00A0:09 and sends a message to the IPC to illuminate the airbag warning indicator.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
OCSM B0061:11	Passenger Seatbelt Tension Sensor: Circuit Short To Ground	A fault is indicated when the OCSM measures voltage below a predetermined threshold on the Belt Tension Sensor (BTS) signal circuit. An open Belt Tension Sensor (BTS) VREF circuit can also set this DTC.
OCSM B0061:12	Passenger Seatbelt Tension Sensor: Circuit Short To Battery	A fault is indicated when the OCSM measures voltage above a predetermined threshold on the Belt Tension Sensor (BTS) signal circuit. An open Belt Tension Sensor (BTS) VREF circuit can also set this DTC.
OCSM B0061:13	Passenger Seatbelt Tension Sensor: Circuit Open	A fault is indicated when the OCSM senses an open on the Belt Tension Sensor (BTS) signal circuit.
OCSM B0061:64	Passenger Seatbelt Tension Sensor: Signal Plausibility Failure	A fault is indicated when the passenger seatbelt is unbuckled and the OCSM measures voltage on the Belt Tension Sensor (BTS) signal circuit greater than a predetermined maximum threshold expected from normal unbelted operation.

Possible Sources

Wiring, terminals or connectors
Belt Tension Sensor (BTS) (part of the front passenger seatbelt buckle)
OCSM

Visual Inspection and Pre-checks

Passenger setbelt should be unbuckled.
Inspect for anything pushing or pulling on the seatbelt buckle.
Inspect for a damaged passenger seatbelt buckle or Belt Tension Sensor (BTS).
Inspect for a damaged passenger seat cushion wiring harness.
Inspect for a loose or damaged OCSM or Belt Tension Sensor (BTS) connector.
Inspect for a damaged OCSM.

WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: Only disconnect or reconnect SRS components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
NOTE: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, Diagnostic Trouble Codes (DTCs) may set.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

BE1 RETRIEVE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

WARNING: Before beginning any service procedure In this article, refer to Safety warnings in General Information. Failure to follow this instruction may result in serious personal injury.

REFER to: Pyrotechnic Device Health and Safety Precautions .

Ignition ON.

Using a diagnostic scan tool, perform OCSM self-test.

Was DTC B0061:11, B0061:12, B0061:13 or B0061:64 retrieved on-demand during self-test?

Yes	This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during the self-test. For DTC B0061:11, GO to BE2 For DTC B0061:12, GO to BE5 For DTC B0061:13, GO to BE7 For DTC B0061:64, GO to BE9

No	This is an intermittent fault when present as a CMDTC only. GO to BE12

BE2 CHECK THE BELT TENSION SENSOR (BTS)

NOTE: This pinpoint test step attempts to change the fault reported by the OCSM by inducing a different fault condition. If the fault reported changes, this indicates the OCSM is functioning correctly and is not the source of the fault.
- Ignition OFF.
- Disconnect Passenger Seatbelt Buckle C3738.
- Ignition ON.
- Ignition OFF.
- Ignition ON.
- NOTE: After turning the ignition on, it is important to wait a minimum of 10 seconds before carrying out the OCSM self-test. This ensures that the OCSM self-diagnostics have completed prior to the self-test.
  
  Using a diagnostic scan tool, perform OCSM self-test.
- DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the Belt Tension Sensor (BTS) disconnected, an open circuit fault is normally retrieved. The Belt Tension Sensor (BTS) shares a connector with the passenger seatbelt buckle switch, and a passenger seatbelt buckle switch circuit fault is also present in the RCM.
Was DTC B0061:11 retrieved on-demand during self-test?

Yes GO to BE3

No INSTALL a new front passenger seatbelt buckle. REFER to: Front Seatbelt Buckle . GO to BE13

BE3 CHECK THE BELT TENSION SENSOR (BTS) SIGNAL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect OCSM C3285.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3285-6	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to BE4

No	REPAIR the circuit(s). Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to BE13

BE4 CHECK THE BELT TENSION SENSOR (BTS) VREF CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3738-2	Courtesy of FORD MOTOR COMPANY	C3285-5

Is the resistance less than 0.5 ohm?

Yes	GO to BE11

No	REPAIR the circuit. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to BE13

BE5 CHECK THE BELT TENSION SENSOR (BTS) SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Disconnect Passenger Side Airbag (Inline) C3053.

Disconnect Passenger Seatbelt Buckle C3738.

Disconnect OCSM C3285.

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3285-6	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to BE13

GO to BE6

BE6 CHECK THE BELT TENSION SENSOR (BTS) GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Disconnect RCM C310A and C310B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3738-3	Courtesy of FORD MOTOR COMPANY	Ground
C3738-6	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	GO to BE10

No	REPAIR the circuit. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to BE13

BE7 CHECK THE BELT TENSION SENSOR (BTS)

NOTE: This pinpoint test step will attempt to change the fault reported by the OCSM by inducing a different fault condition. If the fault reported changes, this indicates the OCSM is functioning correctly and is not the source of the fault.

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Disconnect Passenger Side Airbag (Inline) C3053.

Disconnect Passenger Seatbelt Buckle C3738.

Connect a fused jumper wire:

Lead 1	Measurement / Action	Lead 2
C3738-1	Courtesy of FORD MOTOR COMPANY	C3738-3

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Ignition OFF.

Ignition ON.

NOTE: After turning the ignition on, it is important to wait a minimum of 10 seconds before carrying out the OCSM self-test. This ensures that the OCSM self-diagnostics have completed prior to the self-test.

Using a diagnostic scan tool, perform OCSM self-test.

DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the Belt Tension Sensor (BTS) circuits shorted together, a short to ground fault is normally retrieved. The Belt Tension Sensor (BTS) shares a connector with the passenger seatbelt buckle switch, and a passenger seatbelt buckle switch circuit fault is also present in the RCM.

Did the on-demand DTC change from B0061:13 to B0061:11?

Yes	REMOVE the fused jumper wire and INSTALL a new front passenger seatbelt buckle. REFER to: Front Seatbelt Buckle . GO to BE13

No	REMOVE the fused jumper wire and GO to BE8

BE8 CHECK THE BELT TENSION SENSOR (BTS) SIGNAL CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect OCSM C3285.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3738-1	Courtesy of FORD MOTOR COMPANY	C3285-6

Is the resistance less than 0.5 ohm?

Yes	GO to BE10

No	REPAIR the circuit. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to BE13

BE9 CHECK FOR BELT TENSION SENSOR (BTS) SIGNAL CIRCUIT SHORTED TO THE VREF CIRCUIT

WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

Disconnect OCSM C3285.

Disconnect Passenger Seatbelt Buckle C3738.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3738-1	Courtesy of FORD MOTOR COMPANY	C3738-2

Is the resistance greater than 10, 000 ohms?

Yes	GO to BE10

No	REPAIR the circuits. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information. GO to BE13

BE10 CHECK BELT TENSION SENSOR (BTS) VOLTAGE OUTPUT

Ignition OFF.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Connect OCSM C3285.

Disconnect Passenger Side Airbag (Inline) C3053.

Connect fused jumper wires:

Lead 1	Measurement / Action	Lead 2
Courtesy of FORD MOTOR COMPANY C3738, pin 2, harness side	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY C3738, pin 2, component side
Courtesy of FORD MOTOR COMPANY C3738, pin 3, harness side	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY C3738, pin 3, component side

Repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Buckle the front passenger seatbelt.

While applying tension to the front passenger seatbelt at the seatbelt buckle, measure:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY C3738, pin 1, component side	Courtesy of FORD MOTOR COMPANY	Ground

Does the voltage vary from approximately 0.95 volt with no tension applied to the sensor to approximately 3.8 volts with full tension applied to the sensor?

Yes	REMOVE the fused jumper wires and GO to BE11

No	REMOVE the fused jumper wires and INSTALL a new front passenger seatbelt buckle. REFER to: Front Seatbelt Buckle . GO to BE13

BE11 CONFIRM THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) FAULT

NOTE: Make sure all OCS components, SRS electrical connectors and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) will be recorded.

Ignition OFF.

Prior to reconnecting any previously disconnected SRS component:
- Inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
- Inspect wiring harness for any damage, pinched, cut or pierced wires.
- Repair any concerns found. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

Connect OCSM C3285.

Connect Passenger Seatbelt Buckle C3738 (if previously disconnected).

If previously directed to disconnect Passenger Side Airbag (Inline) C3053, depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Connect Passenger Side Airbag (Inline) C3053 (if previously disconnected).

If previously directed to depower the SRS, repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

Ignition OFF.

Ignition ON.

NOTE: After turning the ignition on, it is important to wait a minimum of 10 seconds before carrying out the OCSM self-test. This ensures that the OCSM self-diagnostics have completed prior to the self-test.

Using a diagnostic scan tool, perform OCSM self-test.

Was the original DTC retrieved on-demand during self-test?

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 OCS sensor. REFER to: Occupant Classification System (OCS) Sensor - Vehicles With: Multi-Contour Seats . or REFER to: Occupant Classification System (OCS) Sensor - Vehicles Without: Multi-Contour Seats . GO to BE13

No	In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test. GO to BE12

BE12 CHECK FOR AN INTERMITTENT FAULT

Ignition OFF.

Disconnect Passenger Seatbelt Buckle C3738.
- Inspect connector(s) (including any inline connectors) for loose or spread terminals and loose or frayed wire connections at terminals.
- Inspect wiring harness for any damage, pinched, cut or pierced wires.
- Repair any concerns found. Refer to Wiring Diagrams OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.

Connect Passenger Seatbelt Buckle C3738.

Ignition ON.

Ignition OFF.

Ignition ON.

NOTE: After turning the ignition on, it is important to wait a minimum of 10 seconds before carrying out the OCSM self-test. This ensures that the OCSM self-diagnostics have completed prior to the self-test.

Using a diagnostic scan tool, perform OCSM self-test.

Was DTC B0061:11, B0061:12, B0061:13 or B0061:64 retrieved on-demand during self-test?

Yes	The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during the self-test. For DTC B0061:11, GO to BE2 For DTC B0061:12, GO to BE5 For DTC B0061:13, GO to BE7 For DTC B0061:64, GO to BE9

CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wiring harness and cycling the ignition frequently. ACTIVATE other system in the same wiring harness. Do not install any new SRS components at this time. Only install SRS components when directed to do so in the pinpoint test. REPAIR any intermittent concerns found. GO to BE13

BE13 CHECK FOR ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition OFF.

Connect all disconnected SRS components.

If previously directed to depower the SRS, repower the SRS. Do not prove out the SRS at this time. REFER to: Supplemental Restraint System (SRS) Repowering .

Ignition ON.

NOTE: When selecting Restraints from the Self Test menu, DTCs are retrieved from the RCM and OCSM.

NOTE: After turning the ignition on, it is important to wait a minimum of 10 seconds before carrying out the OCSM self-test. This ensures that the OCSM self-diagnostics have completed prior to the self-test.

Using a diagnostic scan tool, perform

Restraints self-test.

Are any RCM or OCSM Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test?

Yes	Do not clear any Diagnostic Trouble Codes (DTCs) until all Diagnostic Trouble Codes (DTCs) have been resolved. DIAGNOSE and REPAIR the SRS Diagnostic Trouble Codes (DTCs). REFER to the DTC Chart In this article.

No	The repair is complete. RETURN the vehicle to the customer.