Pinpoint Test - DTC: C. Diagnosis and Verification

B0004:11, B0004:12, B0004:13 and B0004:1A

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

Normal Operation and Fault Symptoms

The RCM continuously monitors the driver knee airbag circuits for the following faults:

• Resistance Out of Range
• Unexpected Voltage
• Short to Ground
• Driver Knee Airbag Fault

When a fault is detected, the RCM stores DTC B0004:11, B0004:12, B0004:13 or B0004:1A and sends a message to the IPC to illuminate the airbag warning indicator.

The RCM analyzes the deployment loop resistance to determine if a malfunction is present. The value displayed in the PID is the deployment loop resistance measured by the RCM. If the displayed value is below or above the required range (refer to the chart below), the RCM may set a DTC. As the deployment loop resistance moves further outside the desired range, the likelihood of a DTC increases. Small fluctuations in resistance may occur due to the effect of road vibrations on the terminal fitting. Crimps and terminals may be affected by stress and movement of the seat belt and may cause an increase in resistance due to wire tension. These variables may result in an intermittent fault. For this reason, the test requires the PID value to be within the desired range before the fault is considered repaired, regardless of whether the module reports the DTC on demand at the time of diagnosis. Following this direction helps ensure that minor resistance changes do not cause repeat concerns. This test uses a process of elimination to diagnose each part of the deployment circuit, including:

• Wiring
• Connections
• Driver Knee Airbag
• RCM

DTC Fault Trigger Conditions

Possible Sources

• Wiring, Terminals or Connectors
• Driver Knee Airbag
• RCM

Visual Inspection and Preliminary Diagnosis

• 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 B0004:11, B0004:12, B0004:13 or B0004:1A 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. For DTC B0004:13 or B0004:1A, GO to A2. For DTC B0004:11, GO to A8. For DTC B0004:12, GO to A10. No This is an intermittent fault if it is present only as a CMDTC. For DTC B0004:13 or B0004:1A, GO to A13. For DTC B0004:11, GO to A14. For DTC B0004:12, GO to A15.

A2 CHECK THE DRIVER KNEE BOLSTER DEPLOYMENT CONTROL RESISTANCE (DEPLOY_02_R) PID (PARAMETER IDENTIFICATION)

Using the diagnostic scan tool, view the RCM parameter identification (PID) data. Monitor and record the resistance value indicated by the DEPLOY_02_R PID. Is the PID value between 1.7 and 2.78 ohms? Yes GO to A12 No GO to A3

A3 CHECK THE DRIVER KNEE AIRBAG DEPLOY CONTROL RESISTANCE (DEPLOY_02_R) PID (PARAMETER IDENTIFICATION) WHILE PERFORMING THE HARNESS CHECK

While monitoring the DEPLOY_02_R PID, check the driver knee air bag circuits harness and accessible connectors (including any inline connectors) by wiggling and flexing the harness and connectors frequently. Record the resistance value indicated by the PID. Is the PID value within the range of 1.7 to 2.78 ohms during the harness check? Yes DISCONNECT the SRS from power and REPAIR the connector, terminals or harness as necessary. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17 No If the PID value is less than 1.7 ohms, GO to A4. If the PID value is greater than 2.78 ohms, GO to A6.

A4 CHECK THE DRIVER KNEE AIRBAG DEPLOY CONTROL DTC (DIAGNOSTIC TROUBLE CODE) FOR CHANGE IN FAULT STATUS (LOW RESISTANCE INDICATED)

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Remove the driver knee airbag. REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). 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 viewing Diagnostic Trouble Codes (DTCs) with the driver knee airbag disconnected, an open circuit fault is usually indicated. Did the On-Demand DTC change from B0004:1A to B0004:13? Yes GO to A11 No GO to A5

A5 CHECK THE DRIVER KNEE AIR BAG CIRCUITS FOR A SHORT TO EACH OTHER

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 C2432-1 C2432-2 Is the resistance greater than 10000 Ohms? Yes GO to A12 No REPAIR the circuits. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17

A6 CHECK THE DRIVER KNEE AIR BAG CIRCUITS 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). Remove the driver knee airbag. REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). Disconnect RCM C310A and C310B. Action: Click to display the connectors Positive lead Measurement/Action Negative lead C310A-5 C2432-1 C310A-6 C2432-2 Is the resistance less than 0.5 Ohms? Yes GO to A7 No REPAIR the circuit(s). For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17

A7 CHECK THE DRIVER KNEE AIRBAG DEPLOY CONTROL DTC (DIAGNOSTIC TROUBLE CODE) FOR CHANGE IN FAULT STATUS (OPEN INDICATED)

Connect RCM C310A and C310B. Connect a fused jumper wire: Click to display connectors Lead 1 Measurement/Action Lead 2 C2432-1 C2432-2 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 viewing Diagnostic Trouble Codes (DTCs) with the driver knee airbag circuits shorted together, a low resistance fault is usually indicated. Did the On-Demand DTC change from B0004:13 to B0004:1A? Yes REMOVE the fusible link and GO to A11. No REMOVE the fusible link and GO to A12.

A8 CHECK THE DRIVER KNEE AIRBAG DEPLOY CONTROL DTC (DIAGNOSTIC TROUBLE CODE) FOR CHANGE IN FAULT STATUS (SHORT TO GROUND INDICATED)

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Remove the driver knee airbag. REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). 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 viewing Diagnostic Trouble Codes (DTCs) with the driver knee airbag disconnected, an open circuit fault is usually indicated. Did the On-Demand DTC change from B0004:11 to B0004:13? Yes GO to A11 No GO to A9

A9 CHECK THE DRIVER KNEE AIR BAG CIRCUITS 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 C2432-1 Ground C2432-2 Ground Is the resistance greater than 10000 ohms? Yes GO to A12 No REPAIR the circuit(s). For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17

A10 CHECK THE DRIVER KNEE AIR BAG CIRCUITS 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). Remove the driver knee airbag. REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). Disconnect RCM C310A and C310B. 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 C2432-1 Ground C2432-2 Ground Is there voltage present? Yes REPAIR the circuit(s). For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17 No GO to A12

A11 CONFIRM THE DRIVER KNEE AIR BAG 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. check the RCM C310A and C310B connector position assurance (CPA) lever/latch for proper operation. repair any problems found. Refer to Wiring Diagrams Cell 5 for schematic and connector information. Install the driver knee airbag. REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). 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 knee air bag. Refer to: Driver Knee Air Bag (501-20B Supplemental Restraint System, Removal and Installation). GO to A17. No During the diagnostic process, the condition became intermittent. Do not install any new SRS components at this time. Install SRS components only if directed by the pinpoint test. For DTC B0004:13 or B0004:1A, GO to A13. For DTC B0004:11, GO to A14. For DTC B0004:12, GO to A15.

A12 CONFIRM THE 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. check the RCM C310A and C310B connector position assurance (CPA) lever/latch for proper operation. repair any problems found. Refer to Wiring Diagrams Cell 5 for schematic and connector information. Install the driver knee airbag. REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). Connect RCM C310A and C310B. 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 condition, STOP this test and FOLLOW the TSB instructions. If no TSB applies to this condition, INSTALL a new RCM. Refer to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation). GO to A17. No During the diagnostic process, the condition became intermittent. Do not install any new SRS components at this time. Install SRS components only if directed by the pinpoint test. For DTC B0004:13 or B0004:1A, GO to A13. For DTC B0004:11, GO to A14. For DTC B0004:12, GO to A15.

A13 CHECK THE DRIVER KNEE AIRBAG DEPLOY CONTROL RESISTANCE (DEPLOY_02_R) PID (PARAMETER IDENTIFICATION) FOR AN INTERMITTENT LOW RESISTANCE OR OPEN CIRCUIT

Using the diagnostic scan tool, view the RCM parameter identification (PID) data. While monitoring the DEPLOY_02_R PID, attempt to recreate the fault by wiggling the connectors (including any inline connectors) and flexing the harness frequently. Record the resistance value indicated by the PID. Is the PID value between 1.7 and 2.78 ohms? Yes 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 A16. No DISCONNECT the SRS and REPAIR as necessary. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17

A14 CHECK THE DRIVER KNEE AIRBAG DEPLOY CONTROL CIRCUITS FOR AN INTERMITTENT SHORT TO GROUND

Attempt to reproduce the fault by wiggling the connectors (including any inline connectors) and flexing the wiring harness frequently. Using the diagnostic scanner, perform the RCM self-test. Was DTC B0004:11 retrieved on-demand during the self-test? Yes DISCONNECT the SRS and REPAIR as necessary. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17 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 A16.

A15 CHECK THE DRIVER KNEE AIRBAG DEPLOY CONTROL CIRCUITS FOR AN INTERMITTENT SHORT TO BATTERY

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Remove the driver knee airbag. REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). 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. Attempt to reproduce the fault by wiggling the connectors (including any inline connectors) and flexing the wiring harness frequently. Using the diagnostic scanner, perform the RCM self-test. Was DTC B0004:12 retrieved on demand during the self-test? Yes DISCONNECT the SRS and REPAIR as necessary. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17 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 A16.

A16 CHECK THE HARNESS AND CONNECTORS

Ignition OFF. De-power the SRS. REFER TO: Supplemental Restraint System (SRS) Disabling and Enabling (501-20B Supplemental Restraint System, General Procedures). Remove the driver knee airbag. REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). 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. Inspect the RCM C310A and C310B connector position assurance (CPA) lever/latch for proper operation. Were any concerns found? Yes REPAIR as necessary. For wiring diagrams and connector information, refer to Wiring Diagrams, Cell 5. GO to A17 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 to do so by a pinpoint test. GO to A17.

A17 CHECK THE SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition OFF. Remove the driver knee airbag (if previously removed). REFER TO: Driver Knee Airbag (501-20B Supplemental Restraint System, Removal and Installation). 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.