PINPOINT TEST AB: DTCs B00C3:12, B00C3:13 AND B00C3:1A

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Never probe the electrical connectors on air bag, Safety Canopy® 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: 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.

Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test .

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 .

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™ 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.

AB1 RETRIEVE OCSM DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM .
- Was DTC B00C3:12, B00C3:13 or B00C3:1A 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 AB2 .
- No: This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to AB11.
AB2 CHECK THE SEAT WIRING AND CONNECTORS
- Ignition OFF.
- Carry out a thorough inspection of the OCS system wiring, terminals and connectors, 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 .
  REPAIR the seat connectors and wiring as needed.
  
  Refer to SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX for schematic and connector information.
  
  GO to AB12.
- No: For DTC B00C3:12, GO to AB3 .
  For DTC B00C3:13, GO to AB5.
  
  For DTC B00C3:1A, GO to AB8.
AB3 CHECK OCS WEIGHT SENSOR BOLT "D" SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Depower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect: Passenger Seat Side Air Bag C327.
- Disconnect: OCS Weight Sensor Bolt "D" C3331.
- Repower the SRS . Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Ignition ON.
- Measure the voltage between OCS weight sensor bolt "D" C3331-3, circuit VR227 (VT/GN), harness side and ground.
  
  Fig 1: Measuring Voltage Between OCS Weight Sensor C3331-3 And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: REPAIR circuit VR227 (VT/GN). GO to AB12.
- No: GO to AB4 .
AB4 CHECK OCS WEIGHT SENSOR BOLT "D" RETURN CIRCUIT FOR A OPEN
- Ignition OFF.
- Measure the resistance between OCS weight sensor bolt "D" C3331-2, circuit RR154 (VT/WH), harness side and ground.
  
  Fig 2: Measuring Resistance Between OCS Weight Sensor C3331-2 And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to AB10.
- No: REPAIR circuit RR154 (VT/WH). GO to AB12.
AB5 CHECK OCS WEIGHT SENSOR BOLT "D" FOR A FAULT STATUS CHANGE (OPEN INDICATED)
NOTE: This pinpoint test step will attempt 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.
- Depower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect: Passenger Seat Side Air Bag C327.
- Disconnect: OCS Weight Sensor Bolt "D" C3331.
- Connect a fused jumper wire between OCS weight sensor bolt "D" C3331-3, circuit VR227 (VT/GN), harness side and C3331- 2, circuit RR154 (VT/WH), harness side.
- Repower the SRS . Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM .
- DIAGNOSTIC TIP: When viewing DTCs with the OCS weight sensor bolt "D" circuits shorted together, a low resistance circuit fault would normally be retrieved.
- Did the on-demand DTC change from B00C3:13 to B00C3:1A?
- Yes: INSTALL a new OCS Weight Sensor Bolt "D". REFER to OCCUPANT CLASSIFICATION SENSOR - MANUAL SEAT TRACK or OCCUPANT CLASSIFICATION SENSOR - POWER SEAT TRACK . GO to AB12.
- No: GO to AB6 .
AB6 CHECK OCS WEIGHT SENSOR BOLT "D" SIGNAL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: OCSM C3159.
- Remove the fused jumper wire from OCS weight sensor bolt "D".
- Measure the resistance between OCSM C3159-16, circuit VR227 (VT/GN), harness side, and OCS weight sensor bolt "D" C3331-3, circuit VR227 (VT/GN), harness side.
  
  Fig 3: Measuring Resistance Between OCSM C3159-16 And OCS Weight Sensor C3331-3
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 0.5 ohm?
- Yes: GO to AB7 .
- No: REPAIR circuit VR227 (VT/GN). GO to AB12.
AB7 CHECK OCS WEIGHT SENSOR BOLT "D" VREF CIRCUIT FOR AN OPEN
- Measure the resistance between OCS weight sensor bolt "D" C3331-1, circuit CR154 (VT/OG), harness side and OCSM C3159-17, circuit CR154 (VT/OG), harness side.
  
  Fig 4: Measuring Resistance Between OCS Weight Sensor C3331-1 And OCSM C3159-17
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to AB10.
- No: REPAIR circuit CR154 (VT/OG). GO to AB12.
AB8 CHECK OCS WEIGHT SENSOR BOLT "D" FOR A FAULT STATUS CHANGE (RESISTANCE BELOW THRESHOLD INDICATED)
NOTE: This pinpoint test step will attempt 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.
- Disconnect: OCS Weight Sensor Bolt "D" 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 bolt "D" disconnected, an open circuit fault would normally be retrieved.
- Did the on-demand DTC change from B00C3:1A to B00C3:13?
- Yes: INSTALL a new OCS Weight Sensor Bolt "B". REFER to OCCUPANT CLASSIFICATION SENSOR - MANUAL SEAT TRACK or OCCUPANT CLASSIFICATION SENSOR - POWER SEAT TRACK . GO to AB12.
- No: GO to AB9 .
AB9 CHECK FOR A SHORT BETWEEN OCS WEIGHT SENSOR BOLT "D" CIRCUITS AND GROUND
- Ignition OFF.
- Disconnect: OCSM C3159.
- Measure the resistance between OCS weight sensor bolt "D":
  - C3331-3, circuit VR227 (VT/GN), harness side and ground.
  - C3331-3, circuit VR227 (VT/GN), harness side and C3331-2, circuit RR154 (VT/WH), harness side.
    
    Fig 5: Measuring Resistance Between OCS Weight Sensor C3331-3 And Ground
    Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
- Yes: GO to AB10 .
- No: REPAIR the affected circuits. GO to AB12.
AB10 CONFIRM THE OCSM FAULT
NOTE: Make sure all restraint system sensor electrical connectors, OCS system components and the OCSM electrical connector are all connected before carrying out the self-test. If not, DTCs will be recorded.
- Ignition OFF.
- 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 SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX for schematic and connector information.
- Connect: OCSM C3159 (if previously disconnected).
- Connect: OCS Weight Sensor Bolt "D" C3331.
- 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 .
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM .
- Was the original DTC retrieved on-demand during self-test?
- Yes: INSTALL a new OCSM . REFER to OCCUPANT CLASSIFICATION SYSTEM MODULE (OCSM) - MANUAL SEAT TRACK or OCCUPANT CLASSIFICATION SYSTEM MODULE (OCSM) - POWER SEAT TRACK . GO to AB12.
- No: In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time . SRS components should only be installed when directed to do so in the pinpoint test . GO to AB11 .
AB11 CHECK FOR AN INTERMITTENT FAULT
- Ignition OFF.
- Disconnect the OCS Weight Sensor Bolt "D" 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 SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX for schematic and connector information.
- Connect: All Previously Disconnected Component(s)/Connector (s).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - OCSM .
- Was DTC B00C3:12, B00C3:13 or B00C3:1A retrieved on-demand during self-test?
- Yes: This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test.
  For DTC B00C3:12, GO to AB3.
  
  For DTC B00C3:13, GO to AB5.
  
  For DTC B00C3:1A, GO to AB8.
- 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 . SRS components should only be installed when directed to do so in the pinpoint test .
  Refer to SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX for schematic and connector information.
  
  GO to AB12 .
AB12 CHECK FOR ADDITIONAL SRS DTCs
- Ignition OFF.
- 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 .
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - Restraints.
- Are any RCM and/or OCSM 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.
- No: CLEAR all RCM and OCSM CMDTCs . PROVE OUT the SRS . Repair is complete. RETURN the vehicle to the customer.