DTC Troubleshooting: 27-3x

DTC 27-3:  Short to Another Wire or Decreased Resistance 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. 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 buckle tensioner 4P connector (A) from the floor wire harness connector (B).


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

6.Reconnect the battery negative cable.

7.Erase the DTC memory.

8.Read the DTC.

Is DTC 27-3 indicated?

YES - Go to 9.

NO - Short 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 both side airbag 2P connectors and the right side seat belt buckle tensioner 4P connector.

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

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

13.Check resistance between the No. 7 and No. 8 terminals of SRS unit connector B (28P). There should be an open circuit or at least 1 MW.


Is the resistance as specified?

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

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