Pinpoint Test AJ: DTCs B1A59:01 and B1A59:11
Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
Pinpoint Test AJ: DTCs B1A59:01 and B1A59:11
Refer to Wiring Diagram Set 46, Supplemental Restraint System for schematic and connector information. Diagrams By Number
Normal Operation
The Occupant Classification System Module (OCSM) monitors each Occupant Classification System (OCS) weight sensor bolt and circuitry for faults. If the OCSM (Occupant Classification System Module) detects a fault, it will store DTC B1A59:01 in memory and send a message to the Restraints Control Module (RCM). When the RCM (Restraints Control Module) receives a fault message from the OCSM (Occupant Classification System Module), it will store DTC B00A0:09 in memory and send a message to the Instrument Panel Cluster (IPC) module to illuminate the air bag warning indicator.
- DTC B1A59:01 (Sensor 5 Volt Supply: General Electrical Failure)- When the OCSM (Occupant Classification System Module) senses a short between the Belt Tension Sensor (BTS) VREF circuit and one of the OCS (Occupant Classification System) weight sensor bolt VREF circuits, a fault will be indicated.
- DTC B1A59:11 (Sensor 5 Volt Supply: Circuit Short To Ground)- When the OCSM (Occupant Classification System Module) senses a short to ground on any of the OCS (Occupant Classification System) weight sensor bolt or BTS (Belt Tension Sensor) VREF circuits, a fault will be indicated.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Passenger seat track assembly
- OCSM (Occupant Classification System Module)
PINPOINT TEST AJ : DTCs B1A59:01 AND B1A59:11
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.
WARNING: Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners, adaptive load limiting retractors, or safety belt inflators, which increases the risk of serious personal injury or death.
NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
NOTE: Supplemental Restraint System (SRS) components should only be disconnected or reconnected 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: Do not install any new OCS (Occupant Classification System) system components until directed to do so.
OCS (Occupant Classification System) system components should only be installed when directed to do so in the pinpoint test.
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(TM) or equivalent to make sure the correct component is being installed. If an incorrect SRS (Supplemental Restraint System) component is installed, DTCs may set.
NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.
AJ1 RETRIEVE OCSM (Occupant Classification System Module) DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- OCSM (Occupant Classification System Module).
Was DTC B1A59:01 or B1A59:11 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. GO to AJ2.
No
This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to AJ8.
AJ2 CHECK THE SEAT WIRING AND CONNECTORS
- 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.
- Carry out a thorough inspection of the OCS (Occupant Classification System) system wiring, terminals and connectors and the related seat wiring harness and body wiring harness terminals and connectors. Inspect the passenger seat wire harness for correct routing and retention. Refer to Seat Wire Harness Routing in the general procedures portion of Seats.
Were any problems noted?
Yes
DEPOWER the SRS (Supplemental Restraint System). REFER to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
REPAIR the seat connectors and wiring as needed.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. GO to AJ9. Diagrams By Number
No
For DTC B1A59:11, GO to AJ3.
For DTC B1A59:01, GO to AJ6.
AJ3 CHECK THE OCS (Occupant Classification System) WEIGHT SENSOR BOLTS FOR A FAULT STATUS CHANGE (SHORT TO GROUND INDICATED)
NOTE: This pinpoint test step will attempt to change the fault reported by the OCSM (Occupant Classification System Module) by inducing a different fault condition. If the fault reported changes, this indicates the OCSM (Occupant Classification System Module) is functioning correctly and is not the source of the fault.
- Disconnect: OCS (Occupant Classification System) Weight Sensor Bolts C3324, C3325, C3330 and C3331.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- OCSM (Occupant Classification System Module).
- DIAGNOSTIC TIP: When viewing DTCs with the OCS (Occupant Classification System) weight sensor bolts disconnected, numerous sensor circuit faults would normally be retrieved.
Was DTC B1A59:11 retrieved on-demand during self-test?
Yes
GO to AJ4.
No
INSTALL a new passenger seat track with OCS (Occupant Classification System) weight sensor bolts. GO to AJ9.
AJ4 CHECK THE BTS (Belt Tension Sensor) FOR A FAULT STATUS CHANGE (SHORT TO GROUND INDICATED)
NOTE: This pinpoint test step will attempt to change the fault reported by the OCSM (Occupant Classification System Module) by inducing a different fault condition. If the fault reported changes, this indicates the OCSM (Occupant Classification System Module) is functioning correctly and is not the source of the fault.
- 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.
- Disconnect: BTS (Belt Tension Sensor) C3238.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- OCSM (Occupant Classification System Module).
- DIAGNOSTIC TIP: When viewing DTCs with the OCS (Occupant Classification System) weight sensor bolts and BTS (Belt Tension Sensor) disconnected, numerous sensor circuit faults would normally be retrieved.
Was DTC B1A59:11 retrieved on-demand during self-test?
Yes
GO to AJ5.
No
INSTALL a new passenger safety belt retractor assembly. GO to AJ9.
AJ5 CHECK THE OCSM (Occupant Classification System Module) VREF CIRCUITS FOR A SHORT TO GROUND
- 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.
- Disconnect: OCSM (Occupant Classification System Module) C3159.
- Measure the resistance between a good ground and the following circuits using the following chart:
Are the resistances greater than 10,000 ohms?
Yes
GO to AJ7.
No
REPAIR the affected circuits. GO to AJ9.
AJ6 CHECK THE OCSM (Occupant Classification System Module)
- 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.
- Disconnect: BTS (Belt Tension Sensor) C3238.
- Disconnect: OCS (Occupant Classification System) Weight Sensor Bolts C3324, C3325, C3330 and C3331.
- Disconnect: OCSM (Occupant Classification System Module) C3159.
- Measure the resistance between C3159-11, circuit LR142 (YE/BU), harness side and the following circuits using the chart below:
Are the resistances greater than 10,000 ohms?
Yes
GO to AJ7.
No
REPAIR the affected circuits. GO to AJ9.
AJ7 CONFIRM THE OCSM (Occupant Classification System Module) FAULT
NOTE: Make sure all restraint system sensor electrical connectors and the RCM (Restraints Control Module) electrical connector are connected before carrying out the self-test. If not, DTCs will be recorded.
- 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.
- Prior to reconnecting any previously disconnected SRS (Supplemental Restraint System) component:
- inspect connector(s) (including any in-line 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.
- repair any concerns found.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number
- Connect: OCSM (Occupant Classification System Module) C3159.
- Connect: OCS (Occupant Classification System) Weight Sensor Bolts C3324, C3325, C3330 and C3331.
- Connect: BTS (Belt Tension Sensor) C3238.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- OCSM (Occupant Classification System Module).
Was DTC B1A59:01 or B1A59:11 retrieved on-demand during self-test?
Yes
INSTALL a new OCSM (Occupant Classification System Module). REFER to Occupant Classification System Module (OCSM) . GO to AJ9.
No
In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test. GO to AJ8.
AJ8 CHECK FOR AN INTERMITTENT FAULT
- 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.
- Disconnect the OCS (Occupant Classification System) Weight Sensor Bolts C3324, C3325, C3330 and C3331 and BTS (Belt Tension Sensor) C3238:
- inspect connector(s) (including any in-line 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 Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number
- Connect: All Previously Disconnected Component(s)/Connector(s).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- OCSM (Occupant Classification System Module).
Was DTC B1A59:01 or B1A59:11 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. GO to AJ2.
No
CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. ACTIVATE other systems in the same wire harness. Do not install any new SRS (Supplemental Restraint System) components at this time. SRS (Supplemental Restraint System) components should only be installed when directed to do so in the pinpoint test.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. GO to AJ9. Diagrams By Number
AJ9 CHECK FOR ADDITIONAL DTCs
- 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.
- Reconnect all SRS (Supplemental Restraint System) components (if previously disconnected).
- 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 Supplemental Restraint System (SRS) Depowering and Repowering.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- Restraints.
NOTE: When selecting Restraints from the Self Test menu, DTCs will be 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 retrieved on-demand during self-test?
Yes
Do not clear any DTCs until all DTCs have been resolved. GO to the DTC Charts for pinpoint test direction. Air Bag Systems/Seat Belt Systems
No
CLEAR all RCM (Restraints Control Module) and OCSM (Occupant Classification System Module) CMDTCs (Continuous Memory Diagnostic Trouble Codes). PROVE OUT the SRS (Supplemental Restraint System). Repair is complete. RETURN the vehicle to the customer.