DTC Troubleshooting: 21-8x

DTC 21-8x (21-80 to 21-89, 21-8A to 21-8F):
Short to Power in Left Side Seat Belt Tensioner

Special Tools Required
SRS inflator simulator (  07SAZ-TB4011A)
 

SRS simulator lead C (  07TAZ-SZ5011A)
 


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, and is DTC 21-8x indicated?


YES - Go to 3.


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


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

4.Disconnect the left side seat belt tensioner 2P connector (A) from the floor wire harness.

 

5.Connect the SRS inflator simulator (2 W connectors) and simulator lead C to the floor wire harness.

6.Reconnect the battery negative cable.

7.Erase the DTC memory.

8.Read the DTC.

Is DTC 21-8x indicated?


YES - Go to 9.


NO - Short to power in the left side seat belt tensioner; replace the left seat belt.n


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

10.Disconnect the right side seat belt tensioner connector.

11.Disconnect SRS unit connector B (28P) from the SRS unit.

12.Disconnect the simulator lead from the floor wire harness.

13.Reconnect the battery negative cable.

14.Turn the ignition switch ON (II).

15.Check for voltage between the No. 1 terminal of SRS unit conncetor B (28P) and body ground, and between the No. 2 terminal and body ground. There should be 0.5 V or less.

 

Is the voltage as specified?


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


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