DTC Troubleshooting: 12-9x, 12-Bx

DTC 12-9x (12-90 to 12-99, 12-9A to 12-9F):Short to Ground in Front Passenger's Airbag First Inflator (LHD 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 12-9x or 12-Bx 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 front passenger's airbag 4P connector (A) from the dashboard wire harness.


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

6.Reconnect the negative cable to the battery.

7.Erase the DTC memory.

8.Read the DTC.

Is DTC 12-9x or 12-Bx indicated?

YES - Go to 9.

NO - Short to ground in the front passenger's airbag first or second inflator; replace the front passenger's airbag.n

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

10.Disconnect SRS unit connector A (28P) from the SRS unit.

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

12.Check resistance between each terminal of both SRS simulator leads and body ground. There should be an open circuit or at least 1 MW.


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 - Short to ground in the dashboard wire harness; replace the dashboard wire harness.n