Diagnostic Test

VERIFY THAT DTC U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION SENSOR IS ACTIVE
NOTE: Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read ORC DTCs.
  Does the scan tool display active: U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION SENSOR?
  
  Yes
  - Go to step 2
  No
  - Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. See DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
CHECK THE (R79), (R81) FRONT LEFT IMPACT SENSOR SIGNAL AND GROUND CIRCUITS FOR A SHORT TO BATTERY

Fig 1: Checking Front Left Impact Sensor Signal & Ground Circuits For A Short To Battery
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 Front Left Impact Sensor connector.
2. Disconnect the ORC 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.
3. Measure the voltage of the (R79) Front Left Impact Sensor Signal circuit and (R81) Sensor Ground circuit at the Front Left Impact Sensor connector and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (R79), (R81) Front Left Impact Sensor circuits for a short to battery.
  - Perform the ORC VERIFICATION TEST. See DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
  No
  - Go to step 3
CHECK THE (R79) FRONT LEFT IMPACT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking Front Left Impact 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. Measure the resistance of the (R79) Front Left Impact Sensor Signal circuit between the Front Left Impact Sensor connector and ground.
  Is the resistance below 100K Ohms?
  
  Yes
  - Repair the (R79) Front Left Impact Sensor Signal circuit for a short to ground.
  - Perform the ORC VERIFICATION TEST. See DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
  No
  - Go to step 4
CHECK THE (R79), (R81) FRONT LEFT IMPACT SENSOR CIRCUITS FOR A SHORT TOGETHER

Fig 3: Checking Front Left Impact Sensor Circuits For A Short Together
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (R79) Front Left Impact Sensor Signal and (R81) Sensor Ground circuits at the Front Left Impact Sensor connector.
  Is the resistance below 100K Ohms?
  
  Yes
  - Repair the (R79), (R81) Front Left Impact Sensor circuits shorted together.
  - Perform the ORC VERIFICATION TEST. See DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
  No
  - Go to step 5
CHECK THE (R81) FRONT LEFT IMPACT SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Fig 4: Checking Front Left Impact Sensor Ground Circuit For An Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Connect the SRS Load Tool Adapter 8443-24 to the Occupant Restraint Control Module connector.
2. Measure the resistance of the (R81) Front Left Impact Sensor Ground circuit between the Front Left Impact Sensor connector and the SRS Load Tool Adapter 8443-24.
  Is the resistance below 1 Ohm?
  
  Yes
  - Go to step 6
  No
  - Repair the (R81) Front Left Impact Sensor 1 Ground circuit for an open or high resistance.
  - Perform the ORC VERIFICATION TEST. See DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
CHECK THE (R79) FRONT LEFT IMPACT SENSOR CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Fig 5: Checking Front Left Impact Sensor Circuit For An Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (R79) Front Left Impact Sensor Ground circuit between the Front Left Impact Sensor connector and the SRS Load Tool Adaptor 8443-24.
  Is the resistance below 1 Ohm?
  
  Yes
  - Go to step 7
  No
  - Repair the (R79) Front Left Impact Sensor Signal circuit for an open or high resistance.
  - Perform the ORC VERIFICATION TEST. See DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
CHECK OPERATION OF THE FRONT LEFT IMPACT SENSOR
1. Replace the Front Left Impact Sensor.
2. Reconnect the vehicle body harness to the impact sensor.
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 codes in all airbag system modules.
6. Turn the Ignition Off, and wait five seconds before turning the Ignition On.
7. Wait one minute, and read active codes and if there are none present read the stored codes.
  Did the active Front Left Impact Sensor DTC return?
  
  Yes
  - Replace the Occupant Restraint Controller in accordance with Service Information.
  - Perform the ORC VERIFICATION TEST. See DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .
  No
  - Repair is complete.
  - Perform the ORC VERIFICATION TEST. See DTC-Based Diagnostics/CONTROLLER, Occupant Restraint (ORC) - Standard Procedure .