DTC 21

DTC 21-1: Open or Increase 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.

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 special tool (2 Ohms connectors) to the floor wire harness 4P connector.
6. Reconnect the battery negative cable.
7. Erase the DTC memory.
8. Read the DTC.

Is DTC 21-1 indicated?

YES - Go to step 9.

NO - Open or increased resistance in the driver's seat belt buckle tensioner; replace the driver's seat belt buckle.

9. 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 A (18P) from the SRS unit (B).




12. Check resistance between the No.1 and No.10 terminals of SRS unit connector A (18P). There should be 2.0 - 3.0 Ohms.

Is the resistance as specified?

YES - Faulty SRS unit or poor contact at SRS unit connector A (18P) and the SRS unit. Check the connection between the connector and the SRS unit. If the connection is OK, replace the SRS unit.

NO - Open or increased resistance in the floor wire harness; replace the floor wire harness.