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. Check the No. 9 (7.5 A) fuse in the driver's under-dash fuse/relay box.
Is the fuse blown?
YES - Go to step 5.
NO - Go to step 6.
5. Replace the No. 9 (7.5 A) fuse in the under-dash fuse/relay box, and turn the ignition switch ON (II) for 30 seconds.
Did the fuse blow again?
YES - Locate and repair the short to ground on the No. 9 fuse circuit, and clear the DTC.
NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Disconnect the driver's power seat wire harness 3P connector (A) from the driver's seat belt buckle switch 3P connector (B).
8. 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 MOhms.
Is the resistance as specified?
YES - Go to step 9.
NO - Replace the driver's seat belt buckle assembly, and clear the DTC.
9. 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 1 MOhms, or more.
Is the resistance as specified?
YES - Go to step 10.
NO - Replace the driver's seat belt buckle assembly, and clear the DTC.
10. Check resistance between the No. 1 terminal of the driver's power seat wire harness 3P connector and body ground. There should be 0-1 Ohm.
Is the resistance as specified?
YES - Go to step 11.
NO - Open in the driver's power seat wire harness, open in the left side wire harness, or poor ground connection at G551. If G551 is OK, replace the faulty harness.
11. Turn the ignition switch ON (II).
Does the seat belt reminder stay on?
YES - Go to step 16.
NO - Go to step 12.
12. Connect the No. 2 terminal of the driver's power seat wire harness 3P connector to body ground with a jumper wire.
Does the seat belt reminder come on?
YES - Go to step 13.
NO - Open in the driver's power seat wire harness, left side wire harness, driver's under-dash fuse/relay box, or dashboard wire harness A. Isolate the faulty harness, and replace the harness or component as necessary.
13. Turn the ignition switch OFF, disconnect the negative cable from the battery, then wait at least 3 minutes.
14. Disconnect all SRS unit connectors from the SRS unit, and reconnect the battery.
15. Connect the No. 4 terminal of SRS unit connector C (8P) to body ground with a jumper wire. Turn the ignition switch ON (II).
Does the seat belt reminder come on?
YES - Disconnect the jumper wire, then go to step 18.
NO - Open in the SRS main harness or dashboard wire harness. Replace the faulty harness.
16. Turn the ignition switch OFF, disconnect the negative cable from the battery, then wait at least 3 minutes.
17. Disconnect all SRS unit connectors, reconnect the battery, then turn the ignition switch ON (II).
Does the seat belt reminder come on?
YES - Short to ground in the SRS main harness, dashboard wire harness A, driver's under-dash fuse/relay box, driver's multiplex control unit, left side wire harness, driver's power seat wire harness, or gauge assembly/circuit board. Replace the faulty harness or component.
NO - Replace the SRS unit
18. Measure voltage between the No. 3 terminal of the driver's power seat wire harness 3P connector and body ground.
Is there battery voltage?
YES - Go to step 19.
NO - Go to step 20.
19. Measure voltage between the No. 8 terminal of SRS unit connector C (18P) and body ground.
Is there battery voltage?
YES - Replace the SRS unit.
NO - Open in the SRS main harness, dashboard wire harness A, or left side wire harness. Replace the faulty wire harness.
20. Measure voltage between the No. 8 terminal of SRS unit connector C (8P) and body ground.
Is there battery voltage?
YES - Open in the driver's power seat wire harness or left side wire harness. Replace the faulty wire harness.
NO - Go to step21.
21. Turn the ignition switch OFF.
22. Disconnect the driver's tension reducer solenoid 2P connector, and disconnect driver's tension reducer diode.
23. Check for continuity between the No. 2 terminal of the driver's tension reducer solenoid 2P connector and body ground,
Is there continuity?
YES - Short to ground in the SRS main harness, dashboard wire harness A, left side wire harness, or driver's power seat wire harness. Replace the faulty harness.
NO - Go to step 24.
24. Turn the ignition switch ON (II).
25. Measure voltage between the No. 1 terminal of the driver's tension reducer solenoid 2P connector and body ground.
Is there battery voltage?
YES - Short to ground in the driver's tension reducer solenoid. Replace the solenoid.
NO - Open in the left side wire harness or driver's under-dash fuse/relay box. Replace the faulty harness or driver's under-dash fuse/relay box.