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U0171






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







- When Monitored:
The Occupant Restraint Controller (ORC) continuously communicates with the Right Front Impact Sensor over the sensor signal circuit. The sensor communication and on board diagnostics are powered by the ORC signal.

- Set Condition:
This code will set, if the ORC and the Right Front Impact Sensor do not establish and maintain valid data communications.





1. VERIFY THAT DTC U0171-LOST COMMUNICATION W/UP-FRONT RIGHT 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 U0171-LOST COMMUNICATION W/UP-FRONT RIGHT SATELLITE ACCELERATION SENSOR DTC?

Yes

- Go To 2

No

- Perform the AIRBAG SYSTEM INTERMITTENT TEST. Airbag System Intermittent Condition Test.

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





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 connector.
2. Disconnect the ORC connectors.

NOTE: Check connectors - Clean/repair as necessary.

3. Connect the SRS Load Tool Adapter 8443-25 to 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.

4. Measure the voltage on 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 connector and ground.

Is there any voltage present?

Yes

- Repair the (R80) and (R82) Right Front Impact Sensor circuits for a short to battery.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

No

- Go To 3

3. CHECK THE (R80) AND (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 cavity 2 and (R82) Right Front Impact Sensor ground circuit cavity 1 between the Right Front Impact Sensor connector and ground.

Is the resistance below 100K Ohms?

Yes

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

No

- Go To 4

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




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

Is the resistance below 100K Ohms?

Yes

- Repair the (R80) and (R82) Right Front Impact Sensor circuits shorted together.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

No

- Go To 5

5. CHECK THE (R80 AND R82) RIGHT FRONT IMPACT SENSOR CIRCUITS FOR AN OPEN OR HIGH RESISTANCE




1. Measure the resistance of the (R80) Right Front Impact Sensor Signal circuit cavity 1 between the Right Front Impact Sensor connector and the SRS Load Tool Adapter 8443-25 cavity 24-10.





2. Measure the resistance of the (R82) Right Front Impact Sensor Ground circuit cavity 2 between the Right Front Impact Sensor connector and the SRS Load Tool Adapter 8443-25 cavity 24-9.

Is the resistance below 1 Ohm on both circuits?

Yes

- Go To 6

No

- Repair the (R80 and R82) Right Front Impact Sensor circuits for an open or high resistance.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

6. CHECK OPERATION OF THE RIGHT FRONT IMPACT SENSOR
1. Replace the Right Front 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 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-LOST COMMUNICATION W/UP-FRONT RIGHT SATELLITE ACCELERATION SENSOR 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 ORC.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

No

- Repair is complete.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

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