DTC Troubleshooting: 12-1x, 12-4x

DTC 12-1x (12-10 to 12-19, 12-1A to 12-1F):Open or Increased Resistance in Driver's Airbag First Inflator (RHD type)
  
  

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

SRS simulator lead J (  070AZ-SNA0100)
 


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 12-1x or 12-4x 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 negative cable from the battery, and wait for 3 minutes.

4.Disconnect the driver's airbag 4P connector (A) from the cable reel.

 

5.Connect the SRS inflator simulator (2 W connectors) and simulator lead J to the cable reel.

6.Reconnect the negative cable to the battery.

7.Erase the DTC memory.

8.Read the DTC.

Is DTC 12-1x or 12-4x indicated?


YES - Go to 9.


NO - Open or increased resistance in the driver's airbag first or second inflator; replace the driver's airbag.n


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

10.Disconnect the dashboard wire harness 4P connector (A) from the cable reel.

 

11.Connect the SRS inflator simulator (2 W connectors) and the simulator lead to the dashboard wire harness.

12.Reconnect the negative cable to the battery.

13.Erase the DTC memory.

14.Read the DTC.

Is DTC 12-1x or 12-4x indicated?


YES - Go to 15.


NO - Open or increased resistance in the cable reel; replace the cable reel.n


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

16.Disconnect SRS unit connector A (28P) from the SRS unit. Do not disconnect the simulator lead from dashboard wire harness 4P connector.

17.Disconnect the SRS inflator simulator from SRS simulator lead.

18.Check resistance between the terminals of both SRS simulator leads. There should be 1 W or less.

 

Is the resistance as specified?


YES - Faulty SRS unit or poor connection at SRS unit connector A (28P) and the SRS unit. Check the connection between the connector and the SRS unit. If the connection is OK, replace the SRS unit.n


NO - Open or increased resistance in dashboard wire harness; replace dashboard wire harness.n