81-61

SRS DTC Troubleshooting: 81-61, 81-62

DTC 81-61: No Signal From the ODS Unit

DTC 81-62: Non-Stipulated Data 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

- 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, SRS Unit Update and retest.

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

2. Read the DTC. Initial Inspection and Diagnostic Overview

Is DTC 81-61 or 81-62 indicated?
YES - Go to step 3.

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.


3. Check the connection between the ODS unit harness 18P connector (A) and the ODS unit.

Is the connection OK?
YES - Go to step 4.

NO - Repair the poor connection, then clear the DTC. If DTC 81-61 or 81-62 is still present, go to step 4.






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

5. Check the No. 8 (7.5 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 to ON (II). If the fuse blows again, check for a short in the No. 8 (7.5 A) fuse circuit (dashboard wire harness, the floor wire harness or the ODS unit harness).


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

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






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

Is there battery voltage?
YES - Go to step 9.

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






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

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

Is the resistance as specified?
YES - Go to step 11.

NO - Open in the SRS floor wire harness, the ODS unit harness, a poor connection at the ground (G702), or a poor connection at the ODS unit harness 18P connector and the ODS unit. Check the connection; if the connection is OK, replace the faulty harness, then clear the DTC.






11. Disconnect the negative cable from the battery, then wait at least 3 minutes.

12. Disconnect SRS unit connector B (39P) from the SRS unit. Technician Safety Information

13. Measure the resistance between SRS unit connector B (39P) terminal No. 1 and body ground. There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Go to step 14.

NO - Short to another wire in the floor wire harness or the ODS unit harness; replace the faulty harness, then clear the DTC.






14. Measure the resistance between SRS unit connector B (39P) terminal No. 1 and ODS unit harness 18P connector terminal No. 7. There should be less than 1.0 Ohms.

Is the resistance as specified?
YES - Faulty ODS 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 - Open in the SRS floor wire harness or ODS unit harness; replace the faulty harness, then clear the DTC.