DTC 28-8x

DTC 28-8x ("x" can be 0 thru 9 or A thru F): Short to Power in Front Passenger's Seat Belt Buckle Tensioner

Special Tools Required
- SRS inflator simulator 07SAZ-TB4011A
- SRS simulator lead K 070AZ-SNAA200

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 to 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 28-8x indicated?

YES - Go to step 3.

NO - Intermittent failure, the 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 to LOCK (0). Disconnect the negative cable from the battery, then wait for 3 minutes.
4. Disconnect the front passenger's seat subharness 4P connector (A) from the front passenger's seat belt buckle tensioner connector (B).






5. Connect the SRS inflator simulator (2 ohms connectors) and simulator lead K to front passenger's seat subharness connector.
6. Reconnect the negative cable to the battery.
7. Clear the DTC memory.
8. Read the DTC.

Is DTC 28-8x indicated?

YES - Go to step 9.

NO - Short to power in the front passenger's seat belt buckle tensioner; replace the front passenger's seat belt buckle.

9. Turn the ignition switch to LOCK (0). Disconnect the negative cable from the battery, then wait for 3 minutes.
10. Disconnect both seat belt tensioner 4P connectors and the driver's seat belt buckle tensioner 4P connector.
11. Disconnect SRS unit connector B (28P) from the SRS unit.
12. Disconnect the simulator lead from the front passenger's seat subharness.
13. Reconnect the negative cable to the battery.
14. Turn the ignition switch to ON (II).
15. Measure the voltage between the No. 9 terminal of SRS unit connector B (28P) and body ground, and the No. 10 terminal and body ground. There should be 0.5 V or less.






Is the voltage as specified?

YES - Faulty SRS unit or poor connection at SRS unit connector B (28P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit.

NO - Go to step 16.

16. Turn the ignition switch to LOCK (0).
17. Disconnect floor wire harness 4P connector C554 (A) from front passenger's seat subharness 4P connector C554 (B).






18. Measure the voltage between the No. 1 terminal of floor wire harness 4P connector C554 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 front passenger's seat subharness; replace the front passenger's seat subharness.

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