DTC Troubleshooting: 12-3x

DTC 12-3x (12-30 to 12-39, 12-3A to 12-3F):
Short to Another Wire or Decreased Resistance in Driver's Airbag First Inflator (RHD type)

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

SRS short canceller (  070AZ-SAA0100)
 
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 12-3x 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 driver's airbag 2P connector (A) from the cable reel.

 

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

6.Reconnect the battery negative cable.

7.Erase the DTC memory.

8.Read the DTC.

Is DTC 12-3x indicated?


YES - Go to 9.


NO - Short in the driver's airbag first inflator; replace the driver's airbag.n

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

10.Disconnect SRS unit connector A (28P) from the SRS unit. Do not disconnect SRS simulator lead from cable reel 2P connector.

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

12.Install the SRS short canceller (070AZ-SAA0100) to No. 9 and No. 10 terminals of the SRS unit connector A.

13.Check resistance between the terminals of the SRS simulator lead. 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 - Go to 14.

14.Disconnect the cable reel from dashboard wire harness B.

15.Check resistance between the terminals of the SRS simulator lead C. There should be an open circuit or at least 1 MW.

 

Is the resistance as specified?


YES - Replace dashboard wire harness B.n


NO - Replace the cable reel.n