DTC Troubleshooting: 21-4

DTC 21-4:  Short to Power in Left Side 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 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 TBLo connector fromthe TBLi connector (1).

 

5.Connect the special tool (2 W connectors) to the TBLi connector.

6.Reconnect the battery negative cable.

7.Erase the DTC memory.

8.Read the DTC.

Is DTC 3-9 or 21-4 indicated?


YES - Go to 9.


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


9.Disconnect the battery negative cable, and wait for 3 minutes.

10.Disconnect the SDo and SPo connectors (1) and the TBRo connector (2).

 

11.Disconnect the U2o connector (A) from the SRS unit (A).

 

12.Disconnect the special tool (2 W connectors) from the TBLi connector.

13.Reconnect the battery negative cable.

14.Turn the ignition switch ON (II).

15.Check for voltage between the No. 1 terminal of the U2o connector and body ground. and between the No. 10 terminal and body ground. There should be 0.5 V or less.

 

Is the voltage as specified?


YES - Faulty  SRS unit; replace the SRS unit.n


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