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U0171






U0171-00-LOST COMMUNICATION W/ UP-FRONT RIGHT SATELLITE SENSOR







Theory of Operation
The impact sensors perform their own self test using power supplied by the Occupant Restraint Controller (ORC) 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 impact sensor performs a self test for internal circuitry at power up during the initialization process, and continuously through the ignition cycle every 10 ms.

- Set Condition:
This Diagnostic Trouble Code (DTC) sets when the ORC receives notification of a self test failure within the impact sensor. Once set, this DTC is latched for the entire ignition cycle.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Restraints System Pre-Diagnostic Procedure.

1. VERIFY ACTIVE DTC

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 U0171-00-LOST COMMUNICATION W/ UP-FRONT RIGHT SATELLITE SENSOR - DTC?

Yes

- Go To 2

No

- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. Restraints System Intermittent Condition Test.

2. CHECK THE (R80, R82) RIGHT FRONT IMPACT SENSOR CIRCUITS FOR A SHORT TO VOLTAGE





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 Right Front Impact Sensor harness connector.
2. Disconnect the ORC harness connectors.

NOTE: Check connectors - Clean/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.

3. Measure the voltage of the (R80) Right Front Impact Sensor Signal circuit cavity 2 and (R82) Right Front Impact Sensor Ground circuit cavity 1 between the Right Front Impact Sensor harness connector and ground.

Is there any voltage present?

Yes

- Repair the (R80, R82) Right Front Impact Sensor circuits for a short to voltage.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 3

3. CHECK THE (R80, R82) RIGHT FRONT IMPACT SENSOR CIRCUITS FOR A SHORT TO GROUND





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 (R80) Right Front Impact Sensor Signal circuit between the Right Front Impact Sensor harness connector cavity 2 and ground.
2. Measure the resistance of the (R82) Right Front Impact Sensor Ground circuit between the Right Front Impact Sensor harness connector cavity 1 and ground.

Is the resistance below 100K Ohms?

Yes

- Repair the (R80, R82) Right Front Impact Sensor circuits for a short to ground.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 4

4. CHECK THE (R80, R82) RIGHT FRONT IMPACT SENSOR CIRCUITS FOR A SHORT TOGETHER




1. Measure the resistance between the (R80) Right Front Impact Sensor Signal and (R82) Right Front Impact Sensor Ground circuits at the Right Front Impact Sensor harness connector.

Is the resistance below 100K Ohms?

Yes

- Repair the (R80, R82) Right Front Impact Sensor circuits shorted together.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Go To 5

5. CHECK THE (R82) RIGHT FRONT IMPACT SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE




1. Connect the SRS Load Tool Adaptor 8443-24 to the ORC C1 harness connector.
2. Measure the resistance of the (R82) Right Front Impact Sensor Ground circuit between the Right Front Impact Sensor harness connector cavity 1 and the SRS Load Tool Adaptor 8443-24 cavity 21.

Is the resistance below 1 Ohm?

Yes

- Go To 6

No

- Repair the (R82) Right Front Impact Sensor Ground circuit for an open or high resistance.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

6. CHECK THE (R80) RIGHT FRONT IMPACT SENSOR SIGNAL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE




1. Measure the resistance of the (R80) Right Front Impact Sensor Signal circuit between the Right Front Impact Sensor harness connector cavity 2 and the SRS Load Tool Adaptor 8443-24 cavity 13.

Is the resistance below 1 Ohm?

Yes

- Go To 7

No

- Repair the (R80) Right Front Impact Sensor Signal circuit for an open or high resistance.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

7. CHECK OPERATION OF THE FRONT RIGHT IMPACT SENSOR
1. Replace the Right Front Impact Sensor.
2. Reconnect the vehicle body harness connector 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.

Does the scan tool display active U0171-00-LOST COMMUNICATION W/ UP-FRONT RIGHT SATELLITE SENSOR DTC return?

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).
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- Repair is complete.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

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