Pinpoint Tests AH: DTCs B1A59:01 and B1A59:11

Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)

Pinpoint Tests

Pinpoint Test AH: 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 detects a fault, it stores DTC B1A59:01 in memory and sends a message to the Restraints Control Module (RCM).

The RCM stores DTC B00A0:09 in memory and sends a message to the Instrument Panel Cluster (IPC) to illuminate the air bag warning indicator.

- DTC B1A59:01 (Sensor 5 Volt Supply: General Electrical Failure) - A fault is indicated when the OCSM senses a short between the Belt Tension Sensor (BTS) VREF circuit and one of the OCS weight sensor bolt VREF circuits.
- DTC B1A59:11 (Sensor 5 Volt Supply: Circuit Short To Ground) - A fault is indicated when the OCSM senses a short to ground on any of the OCS weight sensor bolt or BTS VREF circuits

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Passenger seat track assembly
- OCSM

PINPOINT TEST AH: 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 or adaptive load limiting retractors or probe the electrical connectors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors which increases the risk of serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: 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: Only disconnect or reconnect Supplemental Restraint System (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: Do not install any new OCS system components until directed to do so. OCS system components should only be installed when directed to do so in the pinpoint test.

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 Catalog Advantage(TM) or equivalent to make sure the correct component is being installed. If an incorrect SRS component is installed, DTCs may set.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

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AH1 RETRIEVE OCSM DTCs

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM.
- Was DTC B1A59:01 or B1A59:11 retrieved on-demand during self-test?

Yes
The fault condition is still present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during the self test. GO to AH2.

No
This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to AH8.

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AH2 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 system wiring, terminals and connectors, jumper harness, weight sensor bolt connector and connection, wiring harness routing and the related seat wiring harness and body wiring harness terminals and connectors.
- Were any problems noted?

Yes
DEPOWER the SRS. 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. Diagrams By Number

GO to AH9.

No
For DTC B1A59:11, GO to AH3.

For DTC B1A59:01, GO to AH6.

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AH3 CHECK OCS WEIGHT SENSOR BOLTS FOR A FAULT STATUS CHANGE (SHORT TO GROUND INDICATED)

NOTE: This pinpoint test step attempts to change the fault reported by the OCSM by inducing a different fault condition. If the fault reported changes, this indicates the OCSM is functioning correctly and is not the source of the fault.

- Disconnect: OCS Weight Sensor Bolts C3324, C3325, C3330 and C3331.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM.
- DIAGNOSTIC TIP: When viewing DTCs with the OCS weight sensor bolts disconnected, numerous sensor circuit faults would normally be retrieved.
- Was DTC B1A59:01 retrieved on-demand during self-test?

Yes
GO to AH4.

No
INSTALL a new passenger seat track assembly with OCS weight sensor bolts. REFER to Seating Seat Track. GO to AH9.

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AH4 CHECK BTS FOR A FAULT STATUS CHANGE (SHORT TO GROUND INDICATED)

NOTE: This pinpoint test step attempts to change the fault reported by the OCSM by inducing a different fault condition. If the fault reported changes, this indicates the OCSM 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 C3238 (regular cab and SuperCrew)/C829 (SuperCab).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM.
- DIAGNOSTIC TIP: When viewing DTCs with the OCS weight sensor bolts and BTS disconnected, numerous sensor circuit faults are normally retrieved.
- Was DTC B1A59:01 retrieved on-demand during self-test?

Yes
GO to AH5.

No
INSTALL a new passenger safety belt retractor assembly. REFER to Safety Belt System Service and Repair. GO to AH9.

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AH5 CHECK OCSM 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 C3159.
- Measure resistance between a good ground and the following circuits using the following chart:

- Are the resistances greater than 10,000 ohms?

Yes
GO to AH7.

No
REPAIR the affected circuits.

Refer to Wiring Diagram Set 5 for schematic and connector information. Diagrams By Number

GO to AH9.

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AH7 CONFIRM THE OCSM FAULT

NOTE: Make sure all restraint system sensor electrical connectors and the RCM 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 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 C3159 (if previously disconnected).
- Connect: OCS Weight Sensor Bolts C3324, C3325, C3330 and C3331.
- Connect: BTS C3238 (regular cab and SuperCrew)/C829 (SuperCab).
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM.
- Was DTC B1A59:01 or B1A59:11 retrieved on-demand during self-test?

Yes
INSTALL a new OCSM. REFER to Occupant Classification System Module (OCSM) Service and Repair. GO to AH9.

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 AH9.

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AH8 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: BTS C3238 (regular cab and SuperCrew)/C829 (SuperCab).
- Disconnect: OCS Weight Sensor Bolts C3324, C3325, C3330 and C3331.

- 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).
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM.
- Was DTC B1A59:01 or B1A59:11 retrieved on-demand during self-test?

Yes
The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. GO to AH2.

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 components at this time. Install SRS components only when directed to do so in the pinpoint test.

Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number

GO to AH9.

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AH9 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 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 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 are retrieved from the RCM and OCSM.

- Are any RCM and/or OCSM DTCs retrieved?

Yes
Do not clear any DTCs until all DTCs have been resolved. GO to the DTC Charts for pinpoint test direction. Diagnostic Trouble Code Tests and Associated Procedures

No
CLEAR all RCM and OCSM CMDTCs. PROVE OUT the SRS. The repair is complete. RETURN the vehicle to the customer.

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