SRS DTC Troubleshooting: 12-3x, 12-6x
DTC 12-3x (‘‘x'' can be 0 thru 9 or A thru F):
Short to Another Wire or Decreased Resistance in Driver's Airbag First Inflator (RHD type)
DTC 12-6x (‘‘x'' can be 0 thru 9 or A thru F):
Short to Another Wire or Decreased Resistance in Driver's Airbag Second Inflator (RHD type)
Special Tools Required
  1. 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 or 12-6x indicated?
YES -
Go to Step 3 .
NO -
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC Troubleshooting Index.
  1. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.
  1. Disconnect the driver's airbag 4P connector (A) from the cable reel.
  1. Connect the SRS inflator simulator (2 Ω connectors) and simulator lead J to the cable reel.
  1. Reconnect the negative cable to the battery.
  1. Erase the DTC memory.
Is DTC 12-3x or 12-6x indicated?
YES -
Go to Step 9 .
NO -
Short in the driver's airbag first or second inflator; replace the driver's airbag. ■
  1. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.
  1. Disconnect combination switch wire harness 4P connector (A) from the cable reel.
  1. Connect the SRS inflator simulator (2 Ω connectors) and the simulator lead to the combination switch wire harness.
  1. Reconnect the negative cable to the battery.
  1. Erase the DTC memory.
  1. Read the DTC.
Is DTC 12-3x or 12-6x indicated?
YES -
Go to Step 15 .
NO -
Short in the cable reel; replace the cable reel. ■
  1. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.
  1. Disconnect the SRS inflator simulator from the SRS simulator lead.
  1. Check resistance between the terminals of both SRS simulator leads. There should be an open circuit or at least 1 MΩ.
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. ■
NO -
Short in the combination switch wire harness; replace combination switch wire harness.■