Pinpoint Test - DTC: H. Diagnosis and Testing

B0050:11, B0050:12, B0050:13 and B0050:1D

For circuit and connector information, refer to Wiring Diagrams Cell 46.

Normal Operation and Fault Symptoms

The RCM monitors the driver seatbelt switch circuits for the following faults:

• Open circuit
• Short to voltage
• Short to Ground
• Current out of range
• Driver seatbelt switch failure

When 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

Possible Sources

• Wiring, Terminals or Connectors
• Driver Seat Belt Latch
• RCM

Visual Inspection and Preliminary Diagnosis

• Inspect the driver seat belt buckle for damage.
• Inspect the wiring harness for damage.
• Inspect the connectors for loose or damaged terminals.

WARNING: Do not touch, move or alter the original horizontal mounting position of the Restraints Control Module (RCM) while the RCM is connected and the ignition is ON. Failure to follow this instruction may result in accidental deployment of the airbag and cause serious injury or death.

NOTE: Most concerns are related to connector and/or wiring issues. Perform a thorough inspection and check before proceeding to the Pinpoint Test.

NOTE: Only disconnect or reconnect SRS components when instructed to do so in the Pinpoint Test step. Failure to follow this instruction may result in an incorrect SRS diagnosis.

NOTE: Always verify that 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 confirm the correct component is being installed. If an incorrect SRS component is installed, diagnostic trouble codes (DTCs) may be set.

NOTE: Before returning the vehicle to the customer, the SRS must be fully functional and operating correctly.

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

WARNING: Before starting any service procedure in this section, refer to the Safety Warnings in Section 100-00 General Information. Failure to follow this instruction may result in serious personal injury. REFER TO: Pyrotechnic Device Handling Precautions (100-00 General Information, Description and Operation). The ignition is on. Using the diagnostic scanner, perform the RCM self-test. Was DTC B0050:11, B0050:12, B0050:13 or B0050:1D retrieved on demand during the self-test? Yes This fault cannot be cleared until it is repaired and the DTC is no longer retrieved on demand during the self-test. If DTC B0050:11 or B0050:1D, GO to A2. For DTC B0050:12, GO to A4. For DTC B0050:13, GO to A5. No This is an intermittent fault if present only as a CMDTC. GO to A10

A2 CHECK THE DRIVER SEAT BELT SENSOR DTC (DIAGNOSTIC TROUBLE CODE) TO CHANGE THE FAULT STATUS (SHORT TO GROUND OR CURRENT OUT OF SPECIFIED RANGE)

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Disconnect the driver seatbelt buckle C3201. Re-enable the SRS. Do not confirm the SRS at this time. REFER TO: Disabling and Enabling the Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, General Procedures). The ignition is on. Using the diagnostic scanner, perform the RCM self-test. DIAGNOSTIC TIP: When reviewing Diagnostic Trouble Codes (DTCs) with the driver seat belt buckle switch disconnected, an open circuit fault is usually cleared. 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 A3. For DTC B0050:1D, GO to A9.

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

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Disconnect RCM C310A and C310B. Action: Click to display the connectors Positive lead Measurement/Action Negative lead C3201-5 Ground Is the resistance greater than 10000 Ohms? Yes GO to A9 No REPAIR the circuit. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A11.

A4 CHECK THE DRIVER SEATBELT BUCKLE SWITCH CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Disconnect RCM C310A and C310B. Disconnect the driver side airbag (integrated) C3368. Disconnect the driver seatbelt buckle C3201. Re-enable the SRS. Do not confirm the SRS at this time. REFER TO: Disabling and Enabling the Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, General Procedures). The ignition is on. Action: Click to display the connectors Positive lead Measurement/Action Negative lead C3201-5 Ground Is there voltage present? Yes REPAIR the circuit. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A11. No GO to A9

A5 CHECK THE DRIVER SEAT BELT SENSOR DTC (DIAGNOSTIC TROUBLE CODE) TO CHANGE THE FAULT STATUS (OPEN CIRCUIT INDICATED)

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Disconnect the driver side airbag (integrated) C3368. Disconnect the driver seatbelt buckle C3201. Connect a fused jumper wire: Click to display connectors Lead 1 Measurement/Action Lead 2 C3201-5 C3201-6 Re-enable the SRS. Do not confirm the SRS at this time. REFER TO: Disabling and Enabling the Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, General Procedures). The ignition is on. Using the diagnostic scanner, perform the RCM self-test. DIAGNOSTIC TIP: When reviewing Diagnostic Trouble Codes (DTCs) with the driver seat belt buckle switch circuits shorted together, a short to ground is usually cleared. Did the on-demand DTC change from B0050:13 to B0050:11? Yes REMOVE the fuse jumper and GO to A8. No REMOVE the fuse jumper and GO to A6.

A6 CHECK THE DRIVER SEATBELT BUCKLE SWITCH CIRCUIT FOR AN OPEN

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Disconnect RCM C310A and C310B. Action: Click to display the connectors Positive lead Measurement/Action Negative lead C310B-54 C3201-5 Is the resistance less than 0.5 Ohms? Yes GO to A7 No REPAIR the circuit. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A11.

A7 CHECK THE DRIVER SEATBELT BUCKLE SWITCH GROUND CIRCUIT FOR AN OPEN

Action: Click to display the connectors Positive lead Measurement/Action Negative lead C3201-6 C310B-53 Is the resistance less than 3 ohms? Yes GO to A9 No REPAIR the circuit. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A11.

A8 CONFIRM THE DRIVER SEATBELT BUCKLE SWITCH FAULT

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Before reconnecting any previously disconnected SRS component: inspect the connector(s) (including any integral connectors) for pushed-out, loose or spread terminals, and loose or chafed wire connections at the terminals. inspect the wiring harness for damage, pinching, or cut or pierced wires. Inspect the RCM C310A and C310B connector position assurance (CPA) lock for proper operation. REFER TO: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation). repair any problems found. Refer to Wiring Diagrams Cell 5 for schematic and connector information. Connect RCM C310A and C310B. Connect the driver side airbag (integrated) C3368. Connect the driver seatbelt buckle C3201. Re-enable the SRS. Do not confirm the SRS at this time. REFER TO: Disabling and Enabling the Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, General Procedures). The ignition is on. Using the diagnostic scanner, perform the RCM self-test. Was the original DTC retrieved on demand during the self-test? Yes INSTALL a new driver seat belt buckle. REFER TO: Front Seat Belt Buckle (501-20A Seat Belt Systems, Removal and Installation). GO to A11. No During diagnosis, the fault condition became intermittent. Do not install any new SRS components at this time. Install SRS components only if directed by the pinpoint test. GO to A10

A9 CONFIRM RCM (RESTRAINTS CONTROL MODULE) FAULT

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Before reconnecting any previously disconnected SRS component: inspect the connector(s) (including any integral connectors) for pushed-out, loose or spread terminals, and loose or chafed wire connections at the terminals. inspect the wiring harness for damage, pinching, or cut or pierced wires. Inspect the RCM C310A and C310B connector position assurance (CPA) lock for proper operation. REFER TO: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation). repair any problems found. Refer to Wiring Diagrams Cell 5 for schematic and connector information. Connect RCM C310A and C310B. Connect the driver side airbag (integrated) C3368. Connect the driver seatbelt buckle C3201. Re-enable the SRS. Do not confirm the SRS at this time. REFER TO: Disabling and Enabling the Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, General Procedures). The ignition is on. Using the diagnostic scanner, perform the RCM self-test. Was the original DTC retrieved on demand during the self-test? Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, STOP this test and FOLLOW the TSB instructions. If no TSB applies to this concern, INSTALL a new RCM. REFER TO: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation). GO to A11 No During diagnosis, the fault condition became intermittent. Do not install any new SRS components at this time. Install SRS components only if directed by the pinpoint test. GO to A10

A10 CHECK FOR AN INTERMITTENT FAULT

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Disconnect the driver seatbelt buckle C3201. Inspect the connector(s) (including any inline connectors) for corrosion, loose or spread terminals, and loose or worn wire-to-terminal connections. Inspect the wiring harness for damage, pinching, cut or pierced wires. Rectify any concerns found. Refer to Wiring Diagrams Cell 05 for schematic and connector information. Inspect the RCM C310A and C310B connector position assurance (CPA) lock for proper operation. REFER TO: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation). Reconnect all previously disconnected components/connectors. Re-enable the SRS. Do not confirm the SRS at this time. REFER TO: Disabling and Enabling the Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, General Procedures). The ignition is on. Using the diagnostic scanner, perform the RCM self-test. Was DTC B0050:11, B0050:12, B0050:13 or B0050:1D retrieved on demand during the self-test? Yes This fault cannot be cleared until it is repaired and the DTC is no longer retrieved on demand during the self-test. If DTC B0050:11 or B0050:1D, GO to A2. For DTC B0050:12, GO to A4. For 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 if directed by the pinpoint test. GO to A11

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

Ignition OFF. Reconnect all SRS components (if previously disconnected). If previously instructed to disable the SRS, re-enable the SRS. Do not confirm the SRS at this time. Refer to: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). The ignition is on. NOTE: When Restraints is selected in the Self Test menu, DTCs are retrieved from the RCM, OCSM and, if equipped, BECMB. Using the diagnostic scan tool, perform the Restraints Self-Test. Are any RCM, OCSM and/or BECMB diagnostic trouble codes (DTCs) retrieved on demand during the self-test? Yes Do not clear any Diagnostic Trouble Codes (DTCs) until all DTCs have been resolved. REFER TO: Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, Diagnosis and Testing). No Repair is complete. RETURN the vehicle to the customer.