Lost Communication with Up - Right Front Satellite Acceleration Sensor

U0171 - Lost Communication with Up - Right Front Satellite Acceleration Sensor

For a complete wiring diagram, refer to.

Theory of Operation

The impact sensors perform their own self test using power supplied by the occupant restraint controller then communicate this status back to the ORC with periodic updates. The repair of this fault condition involves verifying the integrity of the wiring between the ORC and the sensor.

• When Monitored: The ORC monitors communication with the impact sensor continuously.

• Set Condition: This DTC sets when the ORC no longer receives notification of the status update from the impact sensor. Once set, this DTC is latched for the entire ignition cycle.

Always perform the Pre - Diagnostic Troubleshooting procedure before proceeding.

Test Step 1 - Determine Active or Stored DTC

• Ensure the battery is fully charged.

• Turn the ignition ON.

• With the scan tool, read ORC DTCs.

Is the DTC active or stored?

ORC - active DTC

• Go to Test Step 2 => [ Test Step 2 - Check for Additional Active Satellite Sensor DTCs ]

ORC - Stored DTC

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics. ORC Restraints System Intermittent Test

Test Step 2 - Check for Additional Active Satellite Sensor DTCs

• the scan tool, load tool ORC adaptor, and a DVOM are required to perform the following tests.

• With the scan tool, read all active ORC DTCs.

Is DTC U0170 - Lost Communication with Up - Front Left Satellite Acceleration Sensor also active?

Yes

• Go to Test Step 8 => [ Test Step 8 - Check Right Front Impact Sensor Ground Circuit and
Left Front Impact Sensor Ground Circuit for a Short to Voltage ]

No

• Go to Test Step 3 => [ Test Step 3 - Check Right Front Impact Sensor Signal Circuit for
an Open ]

Test Step 3 - Check Right Front Impact Sensor Signal Circuit for an Open

• Measure the resistance of the right front impact sensor ground circuit between the right front impact sensor connector and the load tool ORC 8443 - 28 adaptor.

Is the resistance below 1.0 ohm?

Yes

• Go to Test Step 5 => [ Test Step 5 - Check Right Front Impact Sensor Signal Circuit for
a Short to Right Front Impact Sensor Ground Circuit ]

No

• Repair the right front impact sensor ground circuit for an open.

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics ORC Restraints System Verification Test

Test Step 5 - Check Right Front Impact Sensor Signal Circuit for a Short to Right Front Impact Sensor Ground Circuit

• Measure the resistance between the right front impact sensor signal circuit and the right front impact sensor ground circuit at the right front impact sensor connector.

Is the resistance below 5K ohms?

Yes

• Repair the right front impact sensor signal circuit for a short to the right front impact sensor ground circuit.

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics. ORC Restraints System Intermittent Test

No

• Go to Test Step 6 => [ Test Step 6 - Check Right Front Impact Sensor Signal Circuit for
a Short to Ground ]

Test Step 6 - Check Right Front Impact Sensor Signal Circuit for a Short to Ground

• Measure the resistance of the right front impact sensor signal circuit between ground and the right front impact sensor connector.

Is the resistance below 5K ohms?

Yes

• Repair the right front impact sensor signal circuit for a short to ground.

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics. ORC Restraints System Intermittent Test

No

• Go to Test Step 7 => [ Test Step 7 - Check Right Front Impact Sensor Signal Circuit for
a Short to Voltage ]

Test Step 7 - Check Right Front Impact Sensor Signal Circuit for a Short to Voltage

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.

• Measure the voltage of the right front impact sensor signal circuit between the right front impact sensor connector and ground.

Is there any voltage present?

Yes

• Repair the right front impact sensor signal circuit for a short to voltage.

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics. ORC Restraints System Intermittent Test

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.

No

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics. ORC Restraints System Intermittent Test

Test Step 8 - Check Right Front Impact Sensor Ground Circuit and Left Front Impact Sensor Ground Circuit for a Short to Voltage

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.

• Disconnect the left front impact sensor connector.

• Disconnect the right front impact sensor connector.

• Disconnect the ORC connectors.

• Check connectors - Clean and repair as necessary.

• Connect the load tool ORC 8443 - 28 adaptor to the ORC connectors.

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.

• Measure the voltage of the left front impact sensor ground circuit between the load tool ORC 8443 - 28 adaptor and ground.

• Measure the voltage of the right front impact sensor ground circuit between the load tool ORC 8443 - 28 adaptor and ground.

Is there any voltage present on either circuit?

Yes

• Repair the impact sensor circuits for a short to voltage.

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics. ORC Restraints System Intermittent Test

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.

No

• Go to Test Step 9 => [ Test Step 9 - Check Operation of Right Front Impact Sensor ]

Test Step 9 - Check Operation of Right Front Impact Sensor

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.

• Replace the right front impact sensor.

• Reconnect the vehicle body harness to the impact sensor.

• Remove any special tools or jumper wires and reconnect all previously disconnected components - except the Battery.

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.

• Connect the scan tool to the DLC - use the most current software available.

• With the scan tool, erase all codes in the ORC.

• Perform ORC module reset. Access the miscellaneous function menu from the ORC ECU overview screen on the scan tool to perform this operation.

• Wait one minute, and read active codes.

Did the active DTC U0171 - Lost Communication with Up - Front Right Satellite Acceleration Sensor return?

Yes

• Replace the ORC.

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics. ORC Restraints System Intermittent Test

If the occupant restraint controller is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment. Failure to follow these instructions may result in possible serious or fatal injury.

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.

No

• Repair is complete.

• Perform the Restraints System Intermittent Test. Refer to => Non - DTC Based Diagnostics. ORC Restraints System Intermittent Test