DTC 28-1x

DTC 28-1x ("x" can be 0 thru 9 or A thru F): Open or Increased Resistance in Front Passenger's Seat Belt Buckle Tensioner

Special Tools Required
- SRS inflator simulator 07SAZ-TB4011A
- SRS simulator lead K070AZ-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 28-1x 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 the 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 28-1x indicated?

YES - Go to step 9.

NO - Open or increased resistance 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. Measure the resistance between the No. 9 and the No. 10 terminals of SRS unit connector B (28P). There should be 2.0 - 3.0 ohms.






Is the resistance 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 13.

13. Disconnect floor wire harness 4P connector C554 (A) from front passenger's seat subharness 4P connector C554 (B).






14. Measure the resistance between the No. 1 and the No. 2 terminal of floor wire harness 4P connector C554. There should be less than 1.0 ohm.






Is the resistance as specified?

YES - Open or increased resistance in front passenger's seat subharness; replace the front passenger's seat subharness.

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