DTC 21-3

DTC 21-3: Short to Another Wire or Decreased Resistance in Driver's Seat Belt Buckle Tensioner

Special Tools Required
- SRS inflator simulator 07SAZ-TB4011A
- SRS simulator lead F 07XAZ-SZ30100

1. Erase the DTC memory.
2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay on?

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, go to the DTC Troubleshooting Index. Diagnostic Trouble Code Descriptions

3. Turn the ignition switch OFF. Disconnect the battery negative cable, and wait for 3 minutes.




4. Disconnect the driver's seat belt buckle tensioner 4P connector from the floor wire harness 4P connector (A).
5. Connect the SRS inflator simulator (2 Ohms connectors) and the simulator lead F to the floor wire harness 4P connector.
6. Reconnect the battery negative cable.
7. Erase the DTC memory.
8. Read the DTC.

Is DTC 21-3 indicated?

YES - Go to step 9.

NO - Short in the driver's seat belt buckle tensioner; replace the driver's seat belt buckle.

9. Turn the ignition switch OFF. Disconnect the battery negative cable, and wait for 3 minutes.




10. Disconnect both side airbag 2P connectors (A) and the front passenger's seat belt buckle tensioner 4P connector (B).




11. Disconnect SRS unit connector B (18P) from the SRS unit.
12. Disconnect the simulator lead from the floor wire harness 4P connector.




13. Check resistance between the No. 1 and No. 10 terminals of SRS unit connector B (18P). There should be an open circuit or at least 1 MOhm.

Is the resistance as specified?

YES - Faulty SRS unit; replace the SRS unit.

NO - Short in the floor wire harness; replace the floor wire harness.