Pinpoint Test F - DTC: B0050:11, B0050:12, B0050:13 and B0050:1D

Refer to Supplemental Restraint System for schematic and connector information.

Normal Operation and Fault Conditions

The RCM monitors the driver safety belt buckle switch circuits for the following faults:

Open circuit
Short to voltage
Short to ground
Current out of range
Faulted driver safety belt buckle switch

If a fault is detected, the RCM stores DTC B0050:11, B0050:12, B0050:13 or B0050:1D in memory and sends a message to the IPC to illuminate the airbag warning indicator.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
B0050:11	Driver Seatbelt Sensor: Circuit Short to Ground	A fault is indicated when the RCM senses a short to ground on the driver safety belt buckle switch circuit.
B0050:12	Driver Seatbelt Sensor: Circuit Short to Battery	A fault is indicated when the RCM senses a short to voltage on the driver safety belt buckle switch circuit.
B0050:13	Driver Seatbelt Sensor: Circuit Open	A fault is indicated when the RCM senses an open on either driver safety belt buckle switch circuit.
B0050:1D	Driver Seatbelt Sensor: Circuit Current Out of Range	A fault is indicated when the RCM senses current out of an acceptable range between the driver safety belt buckle switch circuits.

Possible Causes

Wiring, terminals or connectors
Driver safety belt buckle
RCM

Visual Inspection and Diagnostic Pre-checks

Inspect for a damaged driver safety belt buckle.
Inspect for damaged wiring harness(es).
Inspect for loose or damaged connectors.

PINPOINT TEST A : B0050:11, B0050:12, B0050:13 AND B0050:1D

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 B0050:11, B0050:12, B0050:13 or B0050:1D 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 B0050:11 or B0050:1D, GO to A2For DTC B0050:12, GO to A4For DTC B0050:13, GO to A5

No	This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to A10

A2 CHECK THE DRIVER SEATBELT SENSOR 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 and Repowering .
- Disconnect: Driver Safety Belt Buckle C3065 .
- Repower the SRS.
  Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and Repowering .
- Ignition ON.
- Using a diagnostic scan tool, perform RCM self-test.
- DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the driver safety belt buckle switch disconnected, an open circuit fault is normally retrieved.
Did the on-demand DTC change from B0050:11 or B0050:1D to B0050:13?

Yes GO to A8

No For DTC B0050:11, GO to A3For DTC B0050:1D, GO to A9

A3 CHECK THE DRIVER SAFETY BELT BUCKLE SWITCH CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

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

Disconnect: RCM C310A and C310B .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3065-2	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 DRIVER SAFETY BELT BUCKLE SWITCH CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

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

Disconnect: RCM C310A and C310B .

Disconnect: Driver Side Airbag C367 .

Disconnect: Driver Safety Belt Buckle C3065 .

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

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3065-2	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 DRIVER SEATBELT SENSOR 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 and Repowering .

Disconnect: Driver Side Airbag C367 .

Disconnect: Driver Safety Belt Buckle C3065 .

Connect a fused jumper wire:

Lead 1	Measurement / Action	Lead 2
C3065-2	Courtesy of FORD MOTOR COMPANY	C3065-1

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

Ignition ON.

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

DIAGNOSTIC TIP: When viewing Diagnostic Trouble Codes (DTCs) with the driver safety belt buckle switch circuits shorted together, a short to ground fault is normally retrieved.

Did the on-demand DTC change from B0050:13 to B0050:11?

Yes	REMOVE the fused jumper wire and GO to A8

No	REMOVE the fused jumper wire and GO to A6

A6 CHECK THE DRIVER SAFETY BELT BUCKLE SWITCH CIRCUIT FOR AN OPEN

Ignition OFF.

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

Disconnect: RCM C310A and C310B .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C310B-54	Courtesy of FORD MOTOR COMPANY	C3065-2

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 DRIVER SAFETY BELT BUCKLE SWITCH GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3065-1	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 DRIVER SAFETY BELT 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) will be recorded.

Ignition OFF.

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

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 .

Connect: Driver Side Airbag C367 .

Connect: Driver Safety Belt Buckle C3065 .

Repower the SRS.
Do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Depowering and 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 driver safety belt buckle. Refer to: Front Seatbelt Buckle . 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) will be recorded.

Ignition OFF.

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

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 .

Connect: Driver Side Airbag C367 .

Connect: Driver Safety Belt Buckle C3065 .

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

Disconnect Driver Safety Belt Buckle C3065 .
- 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.
- Repair any concerns found. Refer to Connector Repair Procedures for schematic and connector information.

Inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation.

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) Depowering and Repowering .

Ignition ON.

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

Was DTC B0050:11, B0050:12, B0050:13 or B0050:1D 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 B0050:11 or B0050:1D, GO to A2For DTC B0050:12, GO to A4For DTC B0050:13, 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)

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.

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) Depowering and Repowering .

Ignition ON.

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

Using a diagnostic scan tool, perform

Restraints self-test.

Are any RCM and/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 RCM and/or OCSM Diagnostic Trouble Codes (DTCs). Refer to: Airbag Supplemental Restraint System (SRS) .

No	CLEAR Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules. PROVE OUT the SRS. The repair is complete. RETURN the vehicle to the customer.