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U0170






U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION SENSOR





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
The Occupant Restraint Controller (ORC) continuously communicates with the Left 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 Left Front Impact Sensor do not establish and maintain valid data communications.





1. 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 DTC?

Yes

- Go To 2

No

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

2. CHECK THE (R79) AND (R81) LEFT FRONT IMPACT SENSOR SIGNAL AND GROUND 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 Left Front Impact Sensor connector.
2. Disconnect the ORC connectors.
3. Connect the SRS Load Tool Adapter 8443-32-R to the ORC connectors.

NOTE: The IP Harness is always connected to the right side (C1) of the 8443-32-R Adapter.

WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury.

4. Measure the (R79) Left Front Impact Sensor Signal cavity 1 and (R81) Left Front Impact Sensor Ground cavity 2 circuit voltage between the Left Front Impact Sensor connector and ground.

Is there any voltage present?

Yes

- Repair the (R79) and (R81) Left 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 (R79) AND (R81) LEFT 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 (R79) Left Front Impact Sensor Signal circuit cavity 2 and (R81) Left Front Impact Sensor Ground circuit cavity 1 between the Left Front Impact Sensor connector and ground.

Is the resistance below 100K Ohms?

Yes

- Repair the (R79) and (R81) Left 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 (R79) AND (R81) LEFT FRONT IMPACT SENSOR CIRCUITS FOR A SHORT TOGETHER




1. Measure the resistance between the (R79) Left Front Impact Sensor Signal and (R81) Left Front Impact Sensor Ground circuits at the Left Front Impact Sensor connector.

Is the resistance below 100K Ohms?

Yes

- Repair the (R79) and (R81) Left Front Impact Sensor circuits shorted together.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test.

No

- Go To 5

5. CHECK THE (R70 AND R81) LEFT FRONT IMPACT SENSOR CIRCUITS FOR AN OPEN OR HIGH RESISTANCE








1. Measure the resistance of the (R79) Left Front Impact Sensor Signal circuit between the Left Front Impact Sensor connector cavity 2 and the SRS Load Tool Adapter 8443-32-R cavity C1-29.
2. Measure the resistance of the (R81) Left Front Impact Sensor Ground circuit between the Left Front Impact Sensor connector cavity 1 and the SRS Load Tool Adapter 8443-32-R cavity C1-28.

Is the resistance below 1 Ohm on both circuits?

Yes

- Go To 6

No

- Repair the (R79 and R81) Left 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 LEFT FRONT IMPACT SENSOR
1. Replace the Left 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. 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 ORC stored codes.
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 U0170-LOST COMMUNICATION W/UP-FRONT LEFT 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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