Diagnostic Test

VERIFY THAT DTC U0173-LOST COMMUNICATION W/LEFT SIDE SATELLITE ACCELERATION SENSOR 2 IS ACTIVE
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.

NOTE:
Using the wiring diagram/schematic as a guide check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

NOTE:
If after the harness inspection it appears the impact sensor connector is only seated halfway. Reseat the harness connector into the impact sensor and lock the tab.

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.

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: B1B72-LEFT SIDE SATELLITE ACCELERATION SENSOR 1 INTERNAL, B1B73-LEFT SIDE SATELLITE ACCELERATION SENSOR 2 INTERNAL, U0172-LOST COMMUNICATION W/LEFT SIDE SATELLITE ACCELERATION SENSOR 1, U0173-LOST COMMUNICATION W/LEFT SIDE SATELLITE ACCELERATION SENSOR 2?
  
  Yes
  - Check for all other internal and lost communication codes indicated in the left side impact sensor daisy chain wiring before diagnosing DTC U0173-LOST COMMUNICATION W/LEFT SIDE SATELLITE ACCELERATION SENSOR 2. Go To The DTC Displayed. Refer to DIAGNOSIS AND TESTING . If internal fault 1 and lost comm fault 1 have been checked follow DTC U0173-LOST COMMUNICATION W/LEFT SIDE SATELLITE ACCELERATION SENSOR 2. Go To 2
  No
  - Perform the AIRBAG SYSTEM INTERMITTENT TEST. Refer to AIRBAG SYSTEM INTERMITTENT TEST .
CHECK THE (R17) AND (R19) LEFT SIDE IMPACT SENSOR 2 CIRCUITS FOR A SHORT TO BATTERY

Fig 1: Checking Left Side Impact Sensor 2 Circuits For A Short To Battery
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 Left Side Impact Sensor 2 harness connector.
2. Disconnect the ORC harness connectors.
3. Connect the SRS Load Tool Adaptor (special tool #8443-25, 56 Way ACM Adapter) to the ORC 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.
4. Measure the voltage of the (R17) Left Side Impact Sensor 2 Signal circuit and the (R19) Sensor 2 Ground circuit at the Left Side Impact Sensor 2 connector.
  Is there any voltage present?
  
  Yes
  - Repair the (R17) and (R19) Left Side Impact Sensor 2 circuits for a short to battery.
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - AIRBAG SYSTEM VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (R17) AND (R19) LEFT SIDE IMPACT SENSOR 2 CIRCUITS FOR A SHORT TO GROUND

Fig 2: Checking Left Side Impact Sensor 2 Circuits For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC

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.
1. Measure the resistance between ground and the (R17) Left Side Impact Sensor 2 Signal circuit at the Left Side Impact Sensor 2 harness connector.
  Is the resistance below 100K ohms?
  
  Yes
  - Repair the (R17) and (R19) Left Side Impact Sensor 2 circuits for a short to ground.
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - AIRBAG SYSTEM VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (R17) AND (R19) LEFT SIDE IMPACT SENSOR 2 CIRCUITS FOR A SHORT TOGETHER

Fig 3: Checking Left Side Impact Sensor 2 Circuits For A Short Together
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (R17) Left Side Impact Sensor 2 Signal circuit and the (R19) Sensor 2 Ground circuit at the Left Side Impact Sensor 2 harness connector.
  Is the resistance below 100K Ohms?
  
  Yes
  - Repair the (R17) and (R19) Left Side Impact Sensor 2 circuits shorted together.
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - AIRBAG SYSTEM VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (R19) LEFT SIDE IMPACT SENSOR 2 GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Fig 4: Checking Left Side Impact Sensor 2 Ground Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (R19) Left Side Impact Sensor 2 Ground circuit between the Left Side Impact Sensor 2 harness connector and the Left Side Impact Sensor 1 harness connector.
  Is the resistance below 1 Ohm?
  
  Yes
  - Go To 6
  No
  - Repair the (R19) Left Side Impact Sensor 2 Ground circuit for an open or high resistance.
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - AIRBAG SYSTEM VERIFICATION TEST .
CHECK THE (R17) LEFT SIDE IMPACT SENSOR 2 CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Fig 5: Checking Left Side Impact Sensor 2 Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (R17) Left Side Impact Sensor 2 Signal circuit between the Left Side Impact Sensor 2 harness connector and the Left Side Impact Sensor 1 harness connector.
  Is the resistance below 1 Ohm?
  
  Yes
  - Go To 7
  No
  - Repair the (R17) Left Side Impact Sensor 2 Signal circuit for an open or high resistance.
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - AIRBAG SYSTEM VERIFICATION TEST .
CHECK OPERATION OF THE LEFT SIDE IMPACT SENSOR 2
1. Replace the Left Side Impact Sensor 2.
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 15 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 Left Side Impact Sensor 2 DTC return?
  
  Yes
  - Go To 8
  No
  - Repair is complete.
  - Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - AIRBAG SYSTEM VERIFICATION TEST .
REPLACE THE OCCUPANT RESTRAINT CONTROLLER
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.

If there are no possible causes remaining, view repair.

Repair

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 in accordance with Service Instructions.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Refer to STANDARD PROCEDURE - AIRBAG SYSTEM VERIFICATION TEST .