81-62

SRS DTC Troubleshooting: 81-61, 81-62, 85-61, 85-62

DTC 81-61, 85-61: No Signal From the ODS Unit

DTC 81-62, 85-62: Response Data Error From the ODS Unit

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures, Technician Safety Information General Troubleshooting Information, Initial Inspection and Diagnostic Overview and Battery Terminal Disconnection and Reconnection. Procedures

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

2. Clear the DTC memory. Initial Inspection and Diagnostic Overview

3. Read the DTC. Initial Inspection and Diagnostic Overview

Is DTC 81-61, 85-61, 81-62, or 85-62 indicated?
YES - Go to step 4.

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


4. Check the connection between the ODS unit harness 18P connector and the ODS unit. ODS Unit Replacement

Is the connection OK?
YES - Go to step 5.

NO - Repair the poor connection and retest. If DTC 81-61, 85-61, 81-62, or 85-62 is still present, go to step 5.


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

6. Check the No. 10 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?
YES - Go to step 7.

NO - Replace the fuse, then turn the ignition switch ON (II). If the fuse blows again, check for a short in the No. 10 (7.5 A) fuse circuit (dashboard wire harness, floor wire harness, front passenger's seat wire harness, or ODS unit harness), then clear the DTC.


7. Disconnect the ODS unit harness 18P connector (A) from the ODS unit.

8. Turn the ignition switch to ON (II).






9. Measure the voltage between body ground and ODS unit harness 18P connector terminal No. 1. There should be battery voltage.

Is there battery voltage?
YES - Go to step 14.

NO - Go to step 10.






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

11. Disconnect dashboard wire harness 24P connector C402 (A) from the floor wire harness C402 (B).

12. Turn the ignition switch to ON (II).






13. Measure the voltage between the No. 13 terminal of the dashboard wire harness 24P connector C402 and body ground. There should be battery voltage.

Is there battery voltage?
YES - Open in the WHT wire of the floor wire harness, front passenger's seat wire harness or ODS unit harness; replace the faulty harness, then clear the DTC.

NO - Open in the dashboard wire harness, poor connection at connector N, or faulty under-dash fuse/relay box; replace the dashboard wire harness or faulty part, then clear the DTC.






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

15. Measure the resistance between body ground and ODS unit harness 18P connector D terminal No. 12 . There should be less than 1.0 Ohms.

Is the resistance as specified?
YES - Go to step 16.

NO - Open in the ODS unit harness, front passenger's seat wire harness or floor wire harness; check the connection at G501. If the connection is OK, replace the faulty harness, then clear the DTC.






16. Turn the ignition switch to LOCK (0). Disconnect the negative cable from the battery, and wait at least 3 minutes.

17. Disconnect SRS unit connector A (28P) from the SRS unit. Technician Safety Information

18. Measure the resistance between body ground and SRS unit connector A (28P) terminal No. 14. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Go to step 19.

NO - Go to step 23.






19. Turn the ignition switch to ON (II), and measure the voltage between body ground and SRS unit connector A (28P) terminal No. 14. There should be less than 0.5 V.

Is the voltage as specified?
YES - Go to step 20.

NO - Short to power in the dashboard wire harness, floor wire harness, front passenger's seat wire harness, or ODS unit harness, then clear the DTC.






20. Measure the resistance between SRS unit connector A (28P) terminal No. 14 and ODS unit harness 18P connector D terminal No. 7. There should be less than 1.0 Ohms.

Is the resistance as specified?
YES - Faulty ODS unit or SRS unit; replace the ODS unit, ODS Unit Replacement then clear the DTC. If the problem is still present, replace the SRS unit. SRS Unit Replacement

NO - Go to step 21.






21. Disconnect the floor wire harness 10P connector C504 from the front passenger's seat wire harness.






22. Measure the resistance between SRS unit connector A (28P) terminal No. 14 and floor wire harness 10P connector C504 terminal No. 8. There should be less than 1.0 Ohms.

Is the resistance as specified?
YES - Open in the front passenger's seat wire harness; replace the front passenger's seat wire harness, then clear the DTC.

NO - Open in the dashboard wire harness or the floor wire harness; replace the faulty harness, then clear the DTC.






23. Disconnect front passenger's seat wire harness 4P connector C801 from the ODS unit harness.






24. Measure the resistance between body ground and SRS unit connector A (28P) terminal No. 14. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Short to ground in the ODS unit harness; replace the ODS unit harness, then clear the DTC.

NO - Short to ground in the dashboard wire harness, front passenger's seat wire harness or floor wire harness; replace the faulty harness, then clear the DTC.