U0171 Lost Communication W/UP Front Right Satellite Acceleration Sensor


U0171 code
Wiring U0171 code

U0171 code - Impact sensors perform their own self test using power supplied by the Occupant Restraint Controller (ORC) then communicate this status back to the module. The repair of this fault centers on verifying the integrity of the sensors internal circuitry and software validity.

When monitored this DTC the Occupant Restraint Controller (ORC) continuously communicates with the front right impact sensor over the sensor signal circuit. The sensor communication and on board diagnostics are powered by the ORC signal. Set condition this DTC this code will set, if the ORC and the front right impact sensor do not establish and maintain valid data communication.

Possible causes U0171 code:

- Signal circuit shorted to battery

- Signal circuit shorted to ground

- Front right impact sensor circuits shorted together

- Front right impact sensor ground circuit open

- Front right impact sensor signal circuit open

- Occupant Restraint Controller (ORC)

Diagnostic test U0171 code

Step 1. Verify that DTC U0171

Turn the ignition off disconnect the 12volt battery and wait two minutes before proceeding. 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. 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.

Turn the ignition on, then reconnect the 12volt battery and wait two minutes before proceeding. Make sure the battery is fully charged.

Does the scan tool display active U0171?

Yes, go to step 2.

No, go to step 9.

Step 2. Check the (R80) and (R82) front right impact sensor signal and ground circuits for a short to battery

U0171 code

Turn the ignition off, disconnect the 12volt battery and wait two minutes before proceeding. 

Disconnect the front right impact sensor harness connector. Disconnect the ORC harness connectors. Connect the SRS load tool adaptor 8443-32-L to the ORC harness connectors. The IP harness is always connected to the right side of the adaptor 8443-32-L 

Turn the ignition on the front right impact sensor signal circuit and the front right impact sensor ground circuit at the front right impact sensor harness connector.

Is there any voltage present?

Yes, turn the ignition off, disconnect battery and wait two minutes before proceeding. Repair the (R80) and (R82) front right impact sensor circuits for a short to battery. Perform the Airbag system verification.

No, go to step 3.

Step 3. Check the (R80) and (R82) front right impact sensor circuits for a short to ground

U0171 code

Turn the ignition off, disconnect the 12 volt battery and wait two minutes before proceeding. Measure the resistance between ground and the (R80) and (R82) front right impact sensor signal circuit and front right impact sensor ground circuit at the front right impact sensor harness connector.

Is the resistance below 100k Ohms?

Yes, repair the (R80) and (R82) front right impact sensor circuits for a short to ground

No, go to step 4.

Step 4. Check the (R80) and (R82) front right impact sensor circuits for a short together

U0171 code

Measure the resistance between the (R80) front right impact sensor signal circuit and the (R82) front right impact sensor ground circuit at the front right impact sensor harness connector.

Is the resistance below 100k Ohms?

Yes, repair the (R80) and (R82) front right impact sensor circuits shorted together.

No, go to step 5.

Step 5. Check the (R82) front right impact sensor ground circuit for an open or high resistance

U0171 code

Measure the resistance of the (R82) front right impact sensor ground circuit between the front right impact sensor harness connector and the SRS load tool adaptor 8443-32-L

Is the resistance below 1 Ohms?

Yes, go to step 6.

No, repair the (R82) front right impact sensor 1 ground circuit for an open or high resistance.

Step 6. Check the (R80) front right impact sensor circuit for an open or high tesistance

U0171 code

Measure the resistance of the (R80) front right impact sensor signal circuit between the front right impact sensor harness connector and the SRS load tool adaptor 8443-32-L

Is the resistance below 1 Ohms?

Yes, go to step 7.

No, repair the front right impact sensor signal circuit for an open or high resistance.

Step 7. Check operation of the front right impact sensor

Replace the front right 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. 

Connect the scan tool to the data link connector-use the most current software available. Use the scan tool and erase the stored codes in all airbag system modules. Turn the ignition off, and wait 15 seconds before turning the ignition on. Wait one minute, and read active codes and if there are none present read the stored codes.

Did the active front right impact sensor DTC return?

Yes, go to step 8

No, repair is complete.

Step 8. Replace the Occupant Restraint Controller 

Turn the ignition off, disconnect the 12volt battery and wait two minutes before proceeding. Disconnect the SRS load tool adaptor.

Repair, if the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced.

Replace the ORC/SRS module, perform the Airbag system verification.

Step 9. Test for an intermittent condition


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