BXXXX:4A
Diagnostic Routine W
Diagnostic Overview
BXXXX:4A (any BXXXX DTC with a 4A failure type) Incorrect Component Installed
The RCM (Restraints Control Module) monitors all SRS (Supplemental Restraint System) device connections. If the RCM (Restraints Control Module) detects a connection or device connected that is not stored in memory or is not configured for the component, the RCM (Restraints Control Module) sets a DTC (Diagnostic Trouble Code) and sends a message to the IPC (Instrument Panel Cluster) to illuminate air bag warning indicator.
DTC Fault Trigger Conditions
Pinpoint Test
WARNING: Do not handle, move or change the original horizontal mounting position of the RCM (Restraints Control Module) while the RCM (Restraints Control Module) is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the Safety Canopy(R) and cause serious personal injury or death.
WARNING: Never disassemble or tamper with seat belt deployable components, including pretensioners, load limiters and inflators. Never back probe deployable device electrical connectors. Tampering or back probing may cause an accidental deployment and result in personal injury or death.
WARNING: Never probe the electrical connectors on air bag, Safety Canopy(R) or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
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 (Supplemental Restraint System) components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS (Supplemental Restraint System).
NOTE: Always make sure the correct SRS (Supplemental Restraint System) 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 Catalog Advantage or equivalent to make sure the correct component is being installed. If an incorrect SRS (Supplemental Restraint System) component is installed, DTCs (Diagnostic Trouble Codes) may set.
NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.
1. RETRIEVE RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes)
1. Ignition ON.
2. Using a scan tool, perform RCM (Restraints Control Module) self-test to retrieve DTCs (Diagnostic Trouble Codes).
Were any incorrect component installed DTCs (Diagnostic Trouble Codes) retrieved on-demand during self-test?
2. CHECK THE VEHICLE HISTORY
1. Ignition OFF.
2. Check the vehicle repair history.
Has a new RCM (Restraints Control Module) or OCSM (Occupant Classification System Module) been installed during this or a prior repair?
3. CHECK THE RCM (Restraints Control Module) AND OCSM (Occupant Classification System Module) VEHICLE IDENTIFICATION PIDs (Parameter Identifications)
1. Ignition ON.
2. Using a scan tool, view RCM (Restraints Control Module) PIDs (Parameter Identifications).
- View and record:
- V_ID_14229_RCM
- OCS_MY
3. Using a scan tool, view OCSM (Occupant Classification System Module) PIDs (Parameter Identifications).
- View and record:
- V_ID_14229_OCS
- MY_14229
4. Verify the correct vehicle application.
Do the PID (Parameter Identification) values match the vehicle application?
4. VERIFY THE ABS (Anti-Lock Brake System) MODULE PART NUMBER
1. Ignition ON.
2. Using the Log Viewer function of the scan tool, retrieve and record the ABS (Anti-Lock Brake System) module part number from Log Viewer.
3. Check the part number recorded against the number listed in the Ford Catalog Advantage or equivalent and verify the correct ABS (Anti-Lock Brake System) module is present in the vehicle.
Is the correct ABS (Anti-Lock Brake System) module installed?
5. VERIFY THE RCM (Restraints Control Module) CONFIGURATION
1. Ignition ON.
2. Carry out PMI (Programmable Module Installation) for the RCM (Restraints Control Module). Use as-built data when carrying out PMI (Programmable Module Installation). Refer to the scan tool instructions to carry out PMI (Programmable Module Installation).
3. Using a scan tool, perform RCM (Restraints Control Module) self-test to retrieve DTCs (Diagnostic Trouble Codes).
Were any incorrect component installed DTCs (Diagnostic Trouble Codes) retrieved on-demand during self-test?
6. CONFIRM THE RCM (Restraints Control Module) FAULT
NOTE: Make sure all SRS (Supplemental Restraint System) components and the RCM (Restraints Control Module) electrical connectors are connected before carrying out the self-test. If not, DTCs (Diagnostic Trouble Codes) will be recorded.
1. Depower the SRS (Supplemental Restraint System). REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .
2. Prior to reconnecting any previously disconnected SRS (Supplemental Restraint System) 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.
- inspect RCM (Restraints Control Module) C310A and C310B CPA (Connector Position Assurance) lever/lock for correct operation. REFER to Restraints Control Module (RCM) .
- repair any concerns found. Refer to Wiring Diagram Set 5 for schematic and connector information Electrical Diagrams.
3. Connect all previously disconnected component(s)/connector(s).
4. Repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint System) at this time. REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .
5. Ignition ON.
6. Using a scan tool, perform RCM (Restraints Control Module) self-test to retrieve DTCs (Diagnostic Trouble Codes).
Were any incorrect component installed DTCs (Diagnostic Trouble Codes) retrieved on-demand during self-test?
7. CHECK FOR AN INTERMITTENT FAULT
1. Using a scan tool, perform RCM (Restraints Control Module) self-test to retrieve DTCs (Diagnostic Trouble Codes).
Were any DTCs (Diagnostic Trouble Codes) retrieved on-demand during self-test?
8. CHECK FOR ADDITIONAL SRS (Supplemental Restraint System) DTCs (Diagnostic Trouble Codes)
1. Ignition OFF.
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.
2. Reconnect all SRS (Supplemental Restraint System) components (if previously disconnected).
3. If previously directed to depower the SRS (Supplemental Restraint System), repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint System) at this time. REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .
4. Ignition ON.
5. Using a scan tool, perform Restraints self-test to retrieve DTCs (Diagnostic Trouble Codes).
NOTE: When selecting Restraints from the Self Test menu, DTCs (Diagnostic Trouble Codes) are retrieved from the RCM (Restraints Control Module) and OCSM (Occupant Classification System Module).
Are any RCM (Restraints Control Module) and/or OCSM (Occupant Classification System Module) DTCs (Diagnostic Trouble Codes) retrieved on-demand during self-test?
