Diagnostic Test

CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM)
NOTE: Make sure that the battery is fully charged.
1. Turn the ignition on, then off and then on again.
2. With the scan tool, read OCM DTCs.
  Does the scan tool display any active DTCs relating to internal faults, ignition faults or battery faults?
  
  Yes
  - Diagnose and repair the DTC. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing for a complete list of DTCs.
  No
  - Go to step 2
VERIFY THAT DTC B1B83-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT LOW IS ACTIVE
1. With the scan tool, read the OCM DTCs.
  Does the scan tool display active B1B83-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT LOW DTC?
  
  Yes
  - Go to step 3
  No
  - Perform the OCS INTERMITTENT TEST. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .
VERIFY THAT B1B83-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT LOW DTC AND B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH DTC ARE ACTIVE AT THE SAME TIME
1. With the scan tool, read the OCM DTCs.
  Does the scan tool display active: B1B83-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT LOW AND B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH AT THE SAME TIME?
  
  Yes
  - See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing and perform the B1B84-PASSENGER SEAT WEIGHT SENSOR 4 - LEFT REAR INPUT CIRCUIT HIGH diagnostic procedure.
  No
  - Go to step 4
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.
  - Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure
  No
  - Go to step 5
VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY
1. Verify that the Passenger Seat Harness is routed correctly.
  Is the Passenger Seat Harness routed correctly?
  
  Yes
  - Go to step 6
  No
  - Reroute the Passenger Seat Harness as necessary.
  - Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .
CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT

Fig 1: Checking Voltage Of Seat Weight Sensor 5-Volt Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the Left-Rear Seat Weight Sensor 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.
2. Measure the voltage of the (R701) Seat Weight Sensor 5-volt circuit.
  Is the voltage above 4.8 volts?
  
  Yes
  - Go to step 7
  No
  - Go to step 9
CHECK (R705) LT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking Left-Rear Seat Weight Sensor Signal Circuit For A Short To Ground
Courtesy of CHRYSLER LLC

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 (R705) LT-RR Seat Weight Sensor Signal circuit between ground and the OCM C2 connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - 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 .
  No
  - Go to step 8
CHECK (R705) LT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR AN OPEN

Fig 3: Checking Left-Rear Seat Weight Sensor Signal Circuit For An Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (R705) LT-RR Seat Weight Sensor Signal circuit between the OCM C2 connector and the Left-Rear Seat Weight Sensor connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Left-Rear Seat Weight Sensor 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 .
  No
  - Replace the Passenger Seat Harnessing 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 .
CHECK (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT FOR AN OPEN
1. Disconnect the OCM C2 connector.
2. Measure the resistance of the (R701) Seat Weight Sensor 5-volt circuit between the OCM C2 connector and the Left-Rear Seat Weight Sensor connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the OCM 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 .
  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 .