81-61
SRS DTC Troubleshooting: 81-61, 81-62
DTC 81-61:
No Signal From the ODS Unit
DTC 81-62:
Incorrect data from the ODS unit
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. Make sure nothing is on the front passenger's seat.
2. Clear the DTCs with the HDS.
3. Turn the ignition switch to ON (II), then wait for 10 seconds.
4. Check for DTCs with the HDS.
Is DTC 81-61 or 81-62 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.
5. Turn the ignition switch to LOCK (0).
6. Check the No. 8 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to step 7.
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 (the floor wire harness or the ODS unit harness); replace the faulty harness, then clear the DTC.
7. Remove the front passenger's seat-back cover/pad. Service and Repair
8. Check the connection between the ODS unit harness 18P connector (A) and the ODS unit.
Is the connection OK?
YES -
Go to step 9.
NO -
Repair the poor connection, clear the DTC, and retest. If DTC 81-61 or 81-62 is still present, go to step 5.
9. Disconnect the ODS unit harness 18P connector (A) from the ODS unit.
10. Turn the ignition switch to ON (II), then wait for 10 seconds.
11. Measure the voltage between body ground and ODS unit harness 18P connector terminal No. 1.
Is there battery voltage?
YES -
Go to step 12.
NO -
Open in the floor wire harness, or the ODS unit harness; replace the faulty harness, then clear the DTC.
12. Turn the ignition switch to LOCK (0).
13. Measure the resistance between body ground and ODS unit harness 18P connector terminal No. 12.
Is there less than 1.0 Ohms?
YES -
Go to step 14.
NO -
Open in the floor wire harness or the ODS unit harness, or a poor connection at the ODS unit harness 18P connector and the ODS unit. Check the ground connection at the G603 Floor Wire Harness (Left Branch). Check the connection; if the connection is OK, replace the faulty harness, then clear the DTC.
14. Disconnect the negative cable from the battery, then wait at least 3 minutes.
15. Disconnect SRS unit connector B (39P) from the SRS unit.
16. Measure the resistance between body ground and SRS unit connector B (39P) terminal No. 1.
Is there an open circuit, or at least 1 MOhms?
YES -
Go to step 17.
NO -
Short to ground or to another wire in the floor wire harness or the ODS unit harness; replace the faulty harness, then clear the DTC.
17. Reconnect the negative cable to the battery.
18. Turn the ignition switch to ON (II), then wait for 10 seconds.
19. Measure the voltage between body ground and SRS unit connector B (39P) terminal No. 1.
Is there less than 0.2 V?
YES -
Go to step 20.
NO -
Short to power in the floor wire harness or the ODS unit harness; replace the faulty harness, then clear the DTC.
20. Turn the ignition switch to LOCK (0).
21. Measure the resistance between SRS unit connector B (39P) terminal No. 1 and ODS unit harness 18P connector terminal No. 7.
Is there less than 1.0 Ohms?
YES -
Faulty ODS unit; 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 -
Open in the floor wire harness or ODS unit harness; replace the faulty harness, then clear the DTC.