81-79

SRS DTC Troubleshooting: 81-79

DTC 81-79:

Front Passenger's Weight Sensors Initial Check Failure

NOTE:

- Before doing this troubleshooting procedure, find out if the vehicle was in a collision. If so, verify that all the required components were replaced with new components, of the correct part number, and that they were properly installed Service and Repair.
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures Service and Repair and General Troubleshooting Information Reading and Clearing Diagnostic Trouble Codes.
- Before replacing the SRS unit, check the SRS unit software version with the HDS. If the software version is not the latest, update the SRS unit software Testing and Inspection, and retest.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to ON (II), then wait for 10 seconds.

3. Check for DTCs with the HDS.

Is DTC 81-79 indicated?

YES -

Go to step 4.

NO -

Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.

4. Turn the ignition switch to LOCK (0).

5. Make sure nothing is on the front passenger's seat.

6. Clear the DTCs with the HDS.

7. Turn the ignition switch to ON (II), then wait for 10 seconds.

8. Check for DTCs with the HDS.

Is DTC 81-79 indicated?

YES -

Go to step 9.

NO -

Intermittent failure, the system is OK at this time.

9. Turn the ignition switch to LOCK (0).

10. Loosen the front passenger's seat mounting bolts, and shake the seat in all directions. Tighten the seat mounting bolts to the specified torque.

11. Clear the DTCs with the HDS.

12. Do the front passenger's weight sensor initialization.

13. Turn the ignition switch to LOCK (0), then wait for 10 seconds.

14. Turn the ignition switch to ON (II), then wait for 10 seconds.

15. Check for DTCs with the HDS.

Is DTC 81-79 indicated?

YES -

Go to step 16.

NO -

Intermittent failure, the system is OK at this time.

16. Replace the front passenger's weight sensor assembly Service and Repair, then clear the DTC.

17. Turn the ignition switch to ON (II), then wait for 10 seconds.

18. Check for DTCs with the HDS.

Is DTC 81-79 indicated?

YES -

Replace the ODS unit Service and Repair, then clear the DTC, and retest. If the DTC is still present, replace the SRS unit Service and Repair.

NO -

The system is OK.