DTC 21-8x

DTC 21-8x ("x" can be 0 thru 9 or A thru F): Short to Power in Driver's Seat Belt Tensioner

Special Tools Required
- SRS inflator simulator 07SAZ-TB4011A
- SRS simulator lead C 07TAZ-SZ5011A
- SRS simulator lead F 07XAZ-SZ30100

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures and General Troubleshooting Information.

1. Clear 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 and is DTC 21-8x indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures. Troubleshooting Intermittent Failures If another DTC is indicated, troubleshoot the DTC.

3. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.
4. Disconnect the driver's seat belt tensioner 2P connector from the left side wire harness (A).






5. Connect the SRS inflator simulator (2 ohms connector) and simulator lead C to the left side wire harness.
6. Reconnect the negative cable to the battery.
7. Clear the DTC memory.
8. Check for a DTC.

Is DTC 21-8x indicated?

YES - Go to step 9.

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

9. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.
10. Disconnect SRS harness 4P connector C656 (A) from left side wire harness 4P connector C656 (B).






11. Connect the SRS inflator simulator (2 ohms connectors) and simulator lead F to the SRS harness.
12. Reconnect the negative cable to the battery.
13. Clear the DTC memory.
14. Check for a DTC.

Is DTC 21-8x indicated?

YES - Go to step 15.

NO - Short to power in the left side wire harness; replace the left side wire harness.

15. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.
16. Disconnect the front passenger's seat belt tensioner connector.
17. Disconnect SRS unit connector B (28P) from the SRS unit.
18. Disconnect the simulator lead from the SRS harness 4P connector.
19. Reconnect the negative cable to the battery.
20. Turn the ignition switch ON (II).
21. Measure the voltage between the No.1 terminal of SRS unit connector B (28P) and body ground, and between the No.2 terminal and body ground. There should be less than 0.5 V.






Is the voltage as specified?

YES - Faulty SRS unit; replace the SRS unit.

NO - Go to step 22.

22. Turn the ignition switch OFF.
23. Disconnect SRS harness 28P connector C854 (A) from SRS subharness connector C854 (B).






24. Turn the ignition switch ON (II).
25. Measure the voltage between the No.1 terminal of the SRS harness 28P connector and body ground and between the No.2 terminal and body ground. There should be less than 0.5 V.






Is the voltage as specified?

YES - Short to power in the SRS subharness; replace the SRS subharness.

NO - Short to power in the SRS harness; replace the SRS harness.