Pinpoint Test - DTC: AK B0061:11, B0061:12, B0061:13, B0061:1C, and B0061:49

WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Supplemental Restraint System . For schematic and connector Information.

Normal Operation and Fault Conditions

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 RH front passenger safety belt buckle)

If a fault is detected, the OCSM stores DTC B0061:11, B0061:12, B0061:13, B0061:1C or B0061:49 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 Conditions
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.
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) return circuit can also set this DTC.
B0061:13	Passenger Seatbelt Tension Sensor: Circuit Open	A fault is indicated when the OCSM senses an open on either Belt Tension Sensor (BTS) circuit.
B0061:1C	Passenger Seatbelt Tension Sensor: Circuit Voltage Out of Range	A fault is indicated when the passenger safety belt is unbuckled and the OCSM measures voltage on the Belt Tension Sensor (BTS) signal circuit greater than the maximum voltage returned during normal sensor operation.
B0061:49	Passenger Seatbelt Tension Sensor: Internal Electronic Failure	A fault is indicated when the OCSM senses an internal fault on the Belt Tension Sensor (BTS) signal circuit.

Possible Sources

Wiring, terminals or connectors
Belt Tension Sensor (BTS) (part of RH front passenger safety belt buckle)
OCSM

Visual Inspection and Diagnostic Pre-checks

Inspect. For a damaged passenger safety belt 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.

PINPOINT TEST A : B0061:11, B0061:12, B0061:13, B0061:1C AND B0061:49

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 be. Fore 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 be. Fore releasing the vehicle to the customer.

A1 RETRIEVE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

WARNING: Be. Fore beginning any service procedure in this article, refer to Pyrotechnic Device Health and Safety Precautions . Failure to follow this instruction may result in serious personal injury.

Ignition ON.

Using a diagnostic scan tool, per. Form OCSM self-test.

Was DTC B0061:11, B0061:12, B0061:13, B0061:1C or B0061:49 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 A2. For DTC B0061:12, GO to A5. For DTC B0061:13, GO to A7. For DTC B0061:1C, GO to A9. For DTC B0061:49, INSTALL a new OCS sensor. REFER to: Occupant Classification System (OCS) Sensor . GO to A13

No	This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to A12

A2 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 Safety Belt Buckle C3738 .
- Using a diagnostic scan tool, per. Form 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 safety belt buckle switch, and a passenger safety belt buckle switch circuit fault will also be present in the RCM.
Was DTC B0061:11 retrieved on-demand during self-test?

Yes GO to A3

No INSTALL a new front passenger safety belt buckle. REFER to: Front Seatbelt Buckle . GO to A13

A3 CHECK THE BELT TENSION SENSOR (BTS) CIRCUITS. For A SHORT TO GROUND OR A SHORT TOGETHER

Ignition OFF.

Disconnect OCSM C3159 .

Measure:

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

Measure:

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

Are the resistances greater than 10, 000 ohms?

Yes

GO to A4

No	REPAIR the circuit(s). REFER to Connector Repair Procedures . For schematic and connector Information. GO to A13

A4 CHECK THE BELT TENSION SENSOR (BTS) VREF CIRCUIT. For AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3159-5	Courtesy of FORD MOTOR COMPANY	C3738-2

Is the resistance less than 0.5 ohm?

Yes

GO to A11

No	REPAIR the circuit. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A13

A5 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) C3049 .

Disconnect Passenger Safety Belt Buckle C3738 .

Disconnect OCSM C3159 .

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
C3159-6	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A13

GO to A6

A6 CHECK THE BELT TENSION SENSOR (BTS) GROUND CIRCUIT. 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

Is the resistance less than 3 ohms?

Yes

GO to A10

No	REPAIR the circuit. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A13

A7 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) C3049 .

Disconnect Passenger Safety Belt 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.

Using a diagnostic scan tool, per. Form 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 safety belt buckle switch, and a passenger safety belt buckle switch circuit fault will also be present in the RCM.

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

Yes	INSTALL a new front passenger safety belt buckle. REFER to: Front Seatbelt Buckle . GO to A13

GO to A8

A8 CHECK THE BELT TENSION SENSOR (BTS) SIGNAL CIRCUIT. For AN OPEN

Ignition OFF.

Disconnect OCSM C3159 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3738-1	Courtesy of FORD MOTOR COMPANY	C3159-6

Is the resistance less than 0.5 ohm?

Yes

GO to A10

No	REPAIR the circuit. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A13

A9 CHECK THE BELT TENSION SENSOR (BTS) SIGNAL CIRCUIT. For A SHORT TO THE BELT TENSION SENSOR (BTS) 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 C3159 .

Disconnect Passenger Safety Belt Buckle C3738 .

Measure:

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

Is the resistance greater than 10, 000 ohms?

Yes

GO to A10

No	REPAIR the circuits. REFER to Connector Repair Procedures . For schematic and connector Information. GO to A13

A10 CHECK BELT TENSION SENSOR (BTS) VOLTAGE OUTPUT

Ignition OFF.

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

Connect OCSM C3159 .

Disconnect Passenger Side Airbag (Inline) C3049 .

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.

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 A11

No	REMOVE the fused jumper wires and INSTALL a new front passenger safety belt buckle. REFER to: Front Seatbelt Buckle . GO to A13

A11 CONFIRM THE OCSM (OCCUPANT CLASSIFICATION SYSTEM MODULE) FAULT

NOTE: Make sure all OCS components, SRS electrical connectors and the RCM electrical connectors are connected be. Fore 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 wire harness. For any damage, pinched, cut or pierced wires.
- repair any concerns found. REFER to Connector Repair Procedures . For schematic and connector Information.

Connect OCSM C3159 (if previously disconnected).

Connect Passenger Safety Belt Buckle C3738 (if previously disconnected).

If previously directed to disconnect Passenger Side Airbag (Inline) C3049 , depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Connect Passenger Side Airbag (Inline) C3049 .

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.

Using a diagnostic scan tool, per. Form OCSM self-test.

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

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 OCS sensor. REFER to: Occupant Classification System (OCS) Sensor . GO to A13

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 A12

A12 CHECK. For AN INTERMITTENT FAULT

Ignition OFF.

Disconnect Passenger Safety Belt Buckle C3738 .
- inspect connector(s) (including any inline connectors). For loose or spread terminals and loose or frayed wire connections at terminals.
- inspect wire harness. For any damage, pinched, cut or pierced wires.
- repair any concerns found. REFER to Connector Repair Procedures . For schematic and connector Information.

Connect Passenger Safety Belt Buckle C3738 .

Ignition ON.

Using a diagnostic scan tool, per. Form OCSM self-test.

Was DTC B0061:11, B0061:12, B0061:13, B0061:1A or B0061:1C 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 or B0061:1A, GO to A2. For DTC B0061:12, GO to A5. For DTC B0061:13, GO to A7. For DTC B0061:1C, GO to A9

CHECK. For causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. ACTIVATE other system in the same wire 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 A13

A13 CHECK. For ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition OFF.

If previously directed to disconnect Passenger Side Airbag (Inline) C3049 , depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Reconnect all SRS components (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.

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

Using a diagnostic scan tool, per. Form

Restraints self-test.

Are any RCMOCSM and/or BECMB 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. REFER to: Airbag Supplemental Restraint System (SRS) .

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