Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY ACTIVE DTC
NOTE:
Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read ORC DTC.
  Does the scan tool display active B0127-12-FRONT DRIVER BUCKLE SWITCH - CIRCUIT SHORT TO BATTERY DTC?
  
  Yes
  - Go To 2
  No
  - Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. Refer to RESTRAINTS SYSTEM INTERMITTENT TEST .
DRIVER SEAT BELT BUCKLE SWITCH SHORTED TO VOLTAGE

Fig 1: Checking Driver Seat Belt Buckle Switch For Short To Voltage
Courtesy of CHRYSLER GROUP, 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 Driver Seat Belt Buckle Switch harness connector.
  NOTE:
  Check connectors - Clean and repair as necessary.
  
  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 on the (R57) Driver Seat Belt Buckle Switch Sense circuit between the appropriate terminal of the Driver Seat Belt Buckle Switch harness connector and ground.
3. Measure the voltage on the (R59) Driver Seat Belt Buckle Switch Ground circuit between the appropriate terminal of the Driver Seat Belt Buckle Switch harness connector and ground.
  Is there a short to voltage on any of these circuits?
  
  Yes
  
  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.
  - Repair the (R57, R59) Driver Seat Belt Buckle Switch circuit for a short to voltage in accordance with the Service Information.
  - Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .
  No
  - Go To 3
(R57) DRIVER SEAT BELT BUCKLE SWITCH SENSE CIRCUIT AND (R59) DRIVER SEAT BELT BUCKLE SWITCH GROUND CIRCUIT FOR AN OPEN

Fig 2: Checking Driver Seat Belt Buckle Switch Sense Circuit And Driver Seat Belt Buckle Switch Ground Circuit For An Open
Courtesy of CHRYSLER GROUP, 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 Driver Seat Belt Buckle Switch harness connector.
2. Disconnect the ORC harness connectors.
  NOTE:
  Check connectors - Clean and repair as necessary.
  
  NOTE:
  After disconnecting the ORC module and the ORC module body harness connector, check the ORC module body harness connector shorting bar pin location. The shorting bar pin location should be down and not visible through the larger center holes of the ORC module body harness connector.
  
  Fig 3: Occupant Restraint Controller (ORC) C1 & C2 Harness Connector End View
  Courtesy of CHRYSLER GROUP, LLC
3. Connect the SRS Load Tool (special tool #8443-25, 56 Way ACM Adapter) to the ORC C2 harness connector.
4. Measure the resistance of the (R57) Driver Seat Belt Buckle Switch Sense circuit between the appropriate terminal of the Driver Seat Belt Buckle Switch harness connector and the appropriate terminal of the SRS Load Tool (special tool #8443-25, 56 Way ACM Adapter).
5. Measure the resistance of the (R59) Driver Seat Belt Buckle Switch Ground circuit between the appropriate terminal of the Driver Seat Belt Buckle Switch harness connector and the appropriate terminal of the SRS Load Tool (special tool #8443-25, 56 Way ACM Adapter).
  Is the resistance greater than 1.0 Ohm on any of these circuits?
  
  Yes
  - Repair the (R57, R59) Driver Seat Belt Buckle Switch circuits for an open in accordance with the Service Information.
  - Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .
  No
  - Go To 4
CHECK OPERATION OF THE DRIVER SEAT BELT BUCKLE SWITCH
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. Replace the Driver Seat Belt Buckle Switch in accordance with the Service Information. Refer to BUCKLE, SEAT BELT, REMOVAL .
2. Reconnect the vehicle body harness connector to the Driver Seat Belt Buckle Switch.
3. Remove any special tools or jumper wires and reconnect all previously disconnected components - except the Battery.
  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.
4. Connect the scan tool to the Data Link Connector - use the most current software available.
5. Use the scan tool and erase the stored DTCs.
6. Turn the Ignition OFF, and wait 15 seconds before turning the Ignition ON.
7. Wait one minute, and read active DTCs and if there are none present read the stored DTCs.
  Does the scan tool display active B0127-12-FRONT DRIVER BUCKLE SWITCH - CIRCUIT SHORT TO BATTERY DTC?
  
  Yes
  
  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.
  
  WARNING:
  If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to follow these instructions may result in possible serious or fatal injury.
  - Replace the Occupant Restraint Controller (ORC) in accordance with the Service Information. Refer to MODULE, OCCUPANT RESTRAINT CONTROLLER, REMOVAL .
  - Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .
  No
  - Repair is complete.
  - Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .