81-61
SRS DTC Troubleshooting: 81-61, 81-62
DTC 81-61: No Signal From the Passenger's Weight Sensor Unit
DTC 81-62: Non-Stipulated Data From the Passenger's Weight Sensor 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. 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, 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 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, clear the DTC, and retest. If DTC 81-61 or 81-62 or still present, go to step 6.
4. Turn the ignition switch to LOCK (0).
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).Replace the faulty harness or component, then clear the DTC.
6. Disconnect the passenger's weight sensor unit 6P connector C from the passenger's weight sensor unit (A).
7. Turn the ignition switch to ON (II).
8. Measure the voltage between passenger's weight sensor unit 6P connector C terminal No. 3 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 to LOCK (0).
10. Disconnect dashboard wire harness A 12P connector (C505) (A) from the rear harness 12P connector (C505) (B).
11. Turn the ignition switch to ON (II).
12. Measure the voltage between dashboard wire harness A 12P connector terminal No. 7 and body ground. There should be battery voltage.
Is there battery voltage?
YES - Open in the rear harness; replace the rear harness, then clear the DTC.
NO - Open in the dashboard wire harness A or dashboard wire harness B; replace the faulty harness, then clear the DTC.
13. Turn the ignition switch to LOCK (0).
14. Measure the resistance between passenger's weight sensor unit 6P connector C terminal No. 6 and body ground. There should be less than 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, then clear the DTC.
15. Turn the ignition switch to LOCK (0). Disconnect the negative cable from the battery, then wait at least 3 minutes.
16. Disconnect SRS unit connector A (28P) from the SRS unit. Technician Safety Information
17. Measure the resistance between SRS unit connector A (28P) terminal No. 14 and body ground. There should be an open circuit or at least 1 MOhms.
Is the resistance as specified?
YES - Go to step 18.
NO - Short to ground in the SRS main harness or rear harness; replace the faulty harness, then clear the DTC.
18. Measure the resistance between SRS unit connector A (28P) terminal No. 14 and passenger's weight sensor unit 6P connector C terminal No. 5 There should be less than 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, Passengers Weight Sensor Unit Replacement then clear the DTC. If the problem is still present, replace the SRS unit. Service and Repair
NO - Open in the SRS main harness or rear harness; replace the faulty harness, then clear the DTC.
