B140D:11, B140D:12, B140D:13, B140D:1D

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Supplemental Restrain System for schematic and connector information.

Normal Operation and Fault Conditions

The RCM continuously monitors the second row right seatbelt buckle switch circuits for the following faults:

Open circuit
Short to voltage
Short to ground
Current out of range
Faulted second row right seatbelt buckle switch

If a fault is detected, the RCM stores DTC B140D:11, B140D:12, B140D:13 or B140D:1D in memory and sends a message to the IPC to illuminate the airbag warning indicator.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
B140D:11	Second Row Passenger Side Seatbelt Sensor: Circuit Short to Ground	A fault is indicated when the RCM senses a short to ground on the second row right seatbelt buckle switch circuit for more than 6 seconds.
B140D:12	Second Row Passenger Side Seatbelt Sensor: Circuit Short to Battery	A fault is indicated when the RCM senses a short to voltage on the second row right seatbelt buckle switch circuit for more than 6 seconds.
B140D:13	Second Row Passenger Side Seatbelt Sensor: Circuit Open	A fault is indicated when the RCM senses an open on either second row right seatbelt buckle switch circuit for more than 6 seconds.
B140D:1D	Second Row Passenger Side Seatbelt Sensor: Circuit Current Out of Range	A fault is indicated when the RCM measures current outside of an acceptable range on the second row right seatbelt buckle switch circuit for more than 6 seconds.

Possible Sources

Wiring, terminals or connectors
Second row right seatbelt buckle switch
RCM

Visual Inspection and Diagnostic Pre-checks

Inspect for a damaged second row right seatbelt buckle switch.
Inspect for damaged wiring harness(es).
Inspect for loose or damaged connectors.

PINPOINT TEST A : B140D:11, B140D:12, B140D:13 AND B140D:1D

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.

A1 RETRIEVE RCM (RESTRAINTS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

WARNING: Before beginning any service procedure, 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 RCM self-test.

Was DTC B140D:11, B140D:12, B140D:13 and B140D:1D retrieved on-demand during self-test?

Yes

If DTC U3003:16 or U3003:17 is also retrieved on-demand, REFER to: Pinpoint Test - DTC: AG . If DTC U3003:16 or U3003:17 is not retrieved on-demand during self-test, DIAGNOSE the second row right seatbelt buckle switch Diagnostic Trouble Codes (DTCs). This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test. For DTC B140D:11 or B140D:1D, GO to A2. For DTC B140D:12, GO to A4. For DTC B140D:13, GO to A5

If DTC U3003:16 or U3003:17 is also retrieved on-demand, REFER to: Pinpoint Test - DTC: AG . If DTC U3003:16 or U3003:17 is not retrieved on-demand during self-test, DIAGNOSE the second row right seatbelt buckle switch Continuous Memory Diagnostic Trouble Codes (CMDTCs). This is an intermittent fault when present as a CMDTC only. GO to A10

A2 CHECK THE SECOND ROW RIGHT SEATBELT BUCKLE SWITCH DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (SHORT TO GROUND OR CURRENT OUT OF RANGE INDICATED)

NOTE: This pinpoint test step attempts to change the fault reported by the RCM by inducing a different fault condition. If the reported fault changes, this indicates the RCM is functioning correctly and is not the source of the fault.
- Ignition OFF.
- Depower the SRS. Refer to: Supplemental Restraint System (SRS) Depowering .
- Disconnect Right Rear Seatbelt Buckle and Inflator C3647 .
- 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, perform RCM self-test.
- DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the second row right seatbelt buckle switch disconnected, an open circuit fault is normally retrieved. A seatbelt inflator circuit fault will also be present in the RCM, since the passenger seatbelt buckle switch shares a connector with the seatbelt inflator.
Did the on-demand DTC change from B140D:11 or B140D:1D to B140D:13?

Yes GO to A8

No For DTC B140D:11, GO to A3. For DTC B140D:1D, GO to A9

A3 CHECK THE SECOND ROW RIGHT SEATBELT BUCKLE SWITCH CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

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

Disconnect RCM C310A and C310B .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3647-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to A9

No	REPAIR the circuit. Refer to Connector Repair Procedures for schematic and connector information. Go to A11

A4 CHECK THE SECOND ROW RIGHT SEATBELT BUCKLE SWITCH CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

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

Disconnect RCM C310A and C310B .

Disconnect Right Rear Seatbelt Buckle and Inflator C3647 .

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
C3647-3	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 A11

GO to A9

A5 CHECK THE SECOND ROW RIGHT SEATBELT BUCKLE SWITCH DTC (DIAGNOSTIC TROUBLE CODE) FOR A FAULT STATUS CHANGE (OPEN INDICATED)

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

Ignition OFF.

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

Disconnect Right Rear Seatbelt Buckle and Inflator C3647 .

Connect a fused jumper wire:

Lead 1	Measurement / Action	Lead 2
C3647-3	Courtesy of FORD MOTOR COMPANY	C3647-4

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, perform RCM self-test.

DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the second row right seatbelt buckle switch circuits shorted together, a short to ground fault is normally retrieved. A seatbelt inflator circuit fault will also be present in the RCM, since the passenger seatbelt buckle switch shares a connector with the seatbelt inflator.

Did the on-demand DTC change from B140D:13 to B140D:11?

Yes	REMOVE the fused jumper wire and GO to A8

No	REMOVE the fused jumper wire and GO to A6

A6 CHECK THE SECOND ROW RIGHT SEATBELT BUCKLE SWITCH 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
C310B-57	Courtesy of FORD MOTOR COMPANY	C3647-3

Is the resistance less than 0.5 ohm?

Yes

GO to A7

No	REPAIR the circuit. Refer to Connector Repair Procedures for schematic and connector information. Go to A11

A7 CHECK THE SECOND ROW RIGHT SEATBELT BUCKLE SWITCH GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3647-4	Courtesy of FORD MOTOR COMPANY	C310B-53

Is the resistance less than 3 ohms?

Yes

GO to A9

No	REPAIR the circuit. Refer to Connector Repair Procedures for schematic and connector information. Go to A11

A8 CONFIRM THE SECOND ROW RIGHT SEATBELT BUCKLE SWITCH FAULT

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

Ignition OFF.

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

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 damaged, pinched, cut or pierced wires.
- inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
- repair any concerns found. Refer to Connector Repair Procedures for schematic and connector information.

Connect Right Rear Seatbelt Buckle and Inflator C3647 .

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, perform RCM self-test.

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

Yes	INSTALL a new second row right seatbelt buckle switch (includes buckle sensor). Refer to: Rear Seatbelt Buckle RH - Vehicles With: Inflatable Seatbelts . Go to A11

No	In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to A10

A9 CONFIRM THE RCM (RESTRAINTS CONTROL MODULE) FAULT

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

Ignition OFF.

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

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 damaged, pinched, cut or pierced wires.
- inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
- repair any concerns found. Refer to Connector Repair Procedures for schematic and connector information.

Connect RCM C310A and C310B (if previously disconnected).

Connect Right Rear Seatbelt Buckle and Inflator C3647 .

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, perform RCM 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 RCM. Refer to: Restraints Control Module (RCM) . Go to A11

No	In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to A10

A10 CHECK FOR AN INTERMITTENT FAULT

Ignition OFF.

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

Disconnect Right Rear Seatbelt Buckle and Inflator C3647 .
- Inspect connector(s) (including any inline connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
- Inspect wire harness for any damage, pinched, cut or pierced wires.
- Inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.
- Repair any concerns found. Refer to Connector Repair Procedures for schematic and connector information.

Connect all previously disconnected component(s) / connector(s).

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, perform RCM self-test.

Was DTC B140D:11, B140D:12, B140D:13 and B140D:1D 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 self-test. For DTC B140D:11 or B140D:1D, GO to A2. For DTC B140D:12, GO to A4. For DTC B140D:13, GO to A5

No	The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to A11

A11 CHECK FOR ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition OFF.

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 and BECMB.

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

Are any RCM 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. DIAGNOSE and REPAIR the Diagnostic Trouble Codes (DTCs). Refer to: Airbag Supplemental Restraint System (SRS) .

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