DTC 81-62

DTC 81-61: No Signal from the Passenger's Weight Sensor Unit

DTC 81-62: Response Data Error from the Passenger's Weight Sensor Unit

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures and General Troubleshooting Information.

1. Clear the DTC memory.
2. Read the DTC.

Is DTC 81-61 or 81-62 indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures. Troubleshooting Intermittent Failures If another DTC is indicated, troubleshoot the DTC.

3. Check the connection between the rear harness 6P connector and the rear passenger's weight-sensor unit.

Is the connection OK?

YES - Go to step 4.

NO - Repair the poor connection and retest. If DTC 81-61 or 81-62 or still present, go to step 6.

4. Turn the ignition switch OFF.
5. Check the No. 2 (15 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES - Go to step 6.

NO - Replace the fuse, then turn the ignition switch ON (II). If the fuse blows again, check for a short in the No. 2 (15 A) fuse circuit (dashboard wire harness A or rear harness).

6. Disconnect the passenger's weight sensor unit 6P connector C from the passenger's weight sensor unit (A).






7. Turn the ignition switch ON (II).
8. Measure the voltage between the No. 3 terminal of the passenger's weight sensor unit 6P connector C and body ground. There should be battery voltage.






Is there battery voltage?

YES - Go to step 13.

NO - Go to step 9.

9. Turn the ignition switch OFF.
10. Disconnect dashboard wire harness A 12P connector (C505) (A) from the rear harness 12P connector (C505) (B).






11. Turn the ignition switch ON (II).
12. Measure the voltage between the No. 7 terminal of dashboard wire harness A 12P connector and body ground. There should be battery voltage.






Is there battery voltage?

YES - Open in the rear harness; replace the rear harness.

NO - Open in the dashboard wire harness A or dashboard wire harness B; replace the faulty harness.

13. Turn the ignition switch OFF.
14. Measure the resistance between the No. 6 terminal of the passenger's weight sensor unit 6P connector C and body ground. There should be 0 - 1.0 ohms.






Is the resistance as specified?

YES - Go to step 15.

NO - Open in the BLK wire of the rear harness; check for poor ground connection at G601. If the connection is OK, replace the rear harness.

15. Turn the ignition switch OFF. Disconnect the negative cable from the battery, then wait for 3 minutes.
16. Disconnect both seat belt tensioner 2P connectors.
17. Disconnect SRS unit connector A (28P) from the SRS unit.
18. Measure the resistance between the No. 14 terminal of SRS unit connector A (28P) and body ground. There should be an open circuit or at least 1 Mohms.






Is the resistance as specified?

YES - Go to step 19.

NO - Short to ground in the SRS main harness or rear harness; replace the faulty harness.

19. Measure the resistance between the No. 14 terminal of SRS unit connector A (28P) and the No. 5 terminal of the passenger's weight sensor unit 6P connector C. There should be 0 - 1.0 ohms.






Is the resistance as specified?

YES - Faulty passenger's weight sensor unit or SRS unit; replace the passenger's weight sensor unit. If the problem is still present, replace the SRS unit.

NO - Open in the SRS main harness or rear harness; replace the faulty harness.