DTC 9-3
DTC 9-3: Faulty Driver's Seat Belt Buckle Switch1. Erase the DTC memory.
2. Turn the ignition switch ON (II), then buckle and unbuckle the driver's seat belt several times.
3. Read the DTC.
Is DTC 9-3 indicated?
YES - Go to step 4.
NO - Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures.
4. Turn the ignition switch OFF.
5. Disconnect the driver's seat wire harness 3P connector (1) (with power seat) or the left side wire harness 3P connector (1) (without power seat) from the driver's seat belt buckle switch 3P connector (2).
6. Buckle the driver's seat belt.
Check resistance between the No. 1 and No. 3 terminals of the driver's seat belt buckle switch 3P connector. There should be 0 - 1 Ohm.
Check resistance between the No. 1 and No. 2 terminals of the same connector. There should be an open circuit, or at least 1 MOhm.
Are the resistance readings as specified?
YES - Go to step 7.
NO - Replace the driver's seat belt buckle assembly, then clear the DTC.
7. Unbuckle the driver's seat belt.
Check resistance between the No. 1 and No. 2 terminals of the driver's seat belt buckle switch 3P connector. There should be 0 - 1 Ohm.
Check resistance between the No. 1 and No. 3 terminals of the same connector. There should be an open circuit, or at least 1 MOhm.
Is the resistance as specified?
YES - Go to step 8.
NO - Replace the driver's seat belt buckle assembly, then clear the DTC.
8. Check resistance between the No. 1 terminal of the driver's seat wire harness 3P connector (with power seat), or the left side wire harness 3P connector (without power seat) and body ground. There should be 0 - 1 Ohm.
Is the resistance as specified?
YES - Go to step 9.
NO - Open in the driver's seat wire harness (with power seat) or left side wire harness, or poor ground connection at G601. If G601 is OK, replace the faulty harness.
9. Disconnect the negative cable from the battery.
10. Disconnect SRS unit connector C (8P) from the SRS unit.
11. Check resistance between the No. 2 terminal of the driver's seat wire harness 3P connector (with power seat) or the left side wire harness 3P connector (without power seat) and body ground. There should be an open circuit, or at least 1 MOhm.
Is the resistance as specified?
YES - Go to step 12.
NO - Short to ground in the driver's seat wire harness (with power seat), the left side wire harness, dashboard wire harness A, multiplex control unit, or the gauge assembly Replace the faulty harness or part.
12. Check resistance between the No. 3 terminal of the driver's seat wire harness 3P connector (with power seat) or the left side wire harness 3P connector (without power seat) and body ground There should be an open circuit, or at least 1 MOhm.
Is the resistance as specified?
YES - Go to step 13.
NO - Short to ground in the driver's seat wire harness (with power seat) or left side wire harness, or dashboard wire harness A; replace the faulty harness.
13. Check resistance between the No. 8 terminal of SRS unit connector C (8P) and the No. 3 terminal of the driver's seat wire harness 3P connector (with power seat), or the left side wire harness 3P connector (without power seat). There should be 0 - 1 Ohm.
Is the resistance as specified?
YES - Go to step 14.
NO - Open in the driver's seat wire harness (with power seat), the left side wire harness, or dashboard wire harness A; replace the faulty harness.
14. Check resistance between the No. 4 terminal of SRS unit connector C (8P) and the No. 2 terminal of the driver's seat wire harness 3P connector (with power seat), or the left side wire harness 3P connector (without power seat). There should be 0 - 1 Ohm.
Is the resistance as specified?
YES - Replace the SRS unit.
NO - Open in the driver's seat wire harness (with power seat), the left side wire harness, dashboard wire harness A, or poor connection at dashboard wire harness A 18P connector, the driver's under-dash fuse/relay box, the left side wire harness 10P connector. Check the connection. If the connection is OK, replace the faulty harness or part.