Diagnostic Test

VERIFY THAT B1BBA-PASSENGER SEAT WEIGHT SENSOR SUPPLY CIRCUIT DTC IS ACTIVE
1. With the scan tool, read the OCM DTCs.
  Does the scan tool display active B1BBA-PASSENGER SEAT WEIGHT SENSOR SUPPLY CIRCUIT DTC?
  
  Yes
  - Go to step 2
  No
  - Go to step 6
INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS
WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Using the wiring diagram/schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched or partially broken wires and broken, bent, pushed out, spread, corroded or contaminated terminals.
  Are any of these conditions present?
  
  Yes
  - Replace the Passenger Seat Harness in accordance with the Service Information.
    NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness.
  - Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .
  No
  - Go to step 3
CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5 VOLT SUPPLY CIRCUIT
1. Disconnect all the Seat Weight Sensor harness connectors.
  WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
2. Measure the voltage of the (R701) Seat Weight Sensor 5 Volt supply circuit on all four seat weight sensors.
  Is the voltage above 4.8 volts?
  
  Yes
  - Go to step 6
  No
  - Go to step 4
CHECK THE PASSENGER SEAT WEIGHT SENSOR 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Disconnect the OCM C2 harness connector.
2. Measure the resistance of the (R701) LT-FT, RT-FT, RT-R, and LT-R Seat Weight Sensor 5 volt supply circuit, between ground and the OCM C2 harness connector.
  Is the resistance below 5 Ohms for any of the LT-FT, RT-FT, LT-R, and RT-R seat weight sensor 5 volt supply circuits?
  
  Yes
  - Replace the suspect Passenger Seat Harness in accordance with the Service Information.
  - Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .
  No
  
  Go to step 5
CHECK (R701) SEAT WEIGHT SENSOR 5 VOLT SUPPLY CIRCUIT FOR AN OPEN
WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Disconnect the OCM C2 harness connector.
2. Measure the resistance of the (R701) Seat Weight Sensor 5 Volt circuit between the OCM C2 connector and the Seat Weight Sensor harness connector.
  Is the resistance below 5 Ohms for any of the LT-FT, RT-FT, LT-R, and RT-R seat weight sensor 5 volt supply circuits?
  
  Yes
  - Replace the OCM in accordance with the Service Information.
  - Perform the B1BA7-OCCUPANT CLASSIFICATION SYSTEM VERIFICATION REQUIRED diagnostic procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing .
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
  No
  - Replace the Passenger Seat Harness in accordance with the Service Information.
  - Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
TEST FOR INTERMITTENT CONDITION
1. With the scan tool, record and erase all DTCs from the OCM.
2. If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.
  WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
3. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
4. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
5. The following additional checks may assist you in identifying a possible intermittent problem.
6. Reconnect any disconnected components and harness connector.
  WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
7. With the scan tool monitor active codes as you work through the following steps.
  WARNING: Maintain a safe distance from all airbags while performing the following steps. Failure to follow these instructions may result in possible serious or fatal injury.
8. Wiggle the wiring harness and connectors of the related airbag circuit or component.
9. If only stored codes return continue the test until the problem area has been isolated.
10. In the previous steps you have attempted to recreate the conditions responsible for setting the active DTC in question.
  Are any ACTIVE DTCs present?
  
  Yes
  - Select the appropriate DTC from DTC List. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing .
  No
  - No problem found at this time. Perform the OCS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure . Erase all codes before returning vehicle to customer.