SRS DTC Troubleshooting: 12-1x
DTC 12-1x (‘‘x'' can be 0 thru 9 or A thru F):
Open or Increased Resistance in Front Passenger's Airbag Inflator (LHD 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 12-1x 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 front passenger's airbag 4P connector (A) from the combination switch wire harness.
  1. Connect the SRS inflator simulator (2 Ω connectors) and simulator lead K to the combination switch wire harness.
  1. Reconnect the negative cable to the battery.
  1. Erase the DTC memory.
Is DTC 12-1x indicated?
YES -
Go to Step 9 .
NO -
Open or increased resistance in the front passenger's airbag inflator; replace the front passenger's airbag. ■
  1. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.
  1. Disconnect SRS unit connector A (28P) from the SRS unit. Do not disconnect the simulator lead from the combination switch wire harness 4P connector.
  1. Disconnect the SRS inflator simulator from the SRS simulator lead.
  1. Check resistance between the terminals of the black SRS simulator lead (A). There should be 1 Ω or less.
Is the resistance as specified?
YES -
Faulty SRS unit or poor connection at SRS unit connector A (28P). Check the connection; if the connection is OK, replace the SRS unit. ■
NO -
Open or increased resistance in the combination switch wire harness; replace the combination switch wire harness.■