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SRS DTC Troubleshooting: 12-1x, 12-2x

DTC 12-1x (‘‘x'' can be 0 thru 9 or A thru F):
Open in the Driver's Airbag First Inflator (RHD model)
DTC 12-2x (‘‘x'' can be 0 thru 9 or A thru F):
Increased Resistance in the Driver's Airbag First Inflator (RHD model)
NOTE:
  1. Turn the ignition switch to ON (II), then wait for 10 seconds.
Is DTC 12-1x or 12-2x indicated?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the negative cable from the battery, then wait at least 3 minutes.
  1. Install a jumper wire between the No. 2 [No. 4] and No. 3 terminals of the cable reel 4P connector.
    [ ]: KE model
  1. Reconnect the negative cable to the battery.
  1. Turn the ignition switch to ON (II), then wait for 10 seconds.
Are DTC 12-1x or 12-2x indicated?
YES -
Go to Step 12 .
NO -
Faulty driver's airbag; replace the driver's airbag.
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the negative cable from the battery, then wait at least 3 minutes.

  1. Remove the column cover , then disconnect the dashboard wire harness 4P connector (A) from the cable reel.

  1. Install a jumper wire between the No. 2 [No. 4] and the No. 3 terminals of the dashboard wire harness 4P connector.
    [ ]: KE model
  1. Reconnect the negative cable to the battery.
Is DTC 12-1x or 12-2x indicated?
YES -
Go to Step 18 .
NO -
Open or increased resistance in the cable reel; replace the cable reel.
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the negative cable from the battery, then wait at least 3 minutes.
  1. Remove a jumper wire from the dashboard wire harness 4P connector.

  1. Install a jumper wire between the No. 5 and the No. 6 terminals of SRS unit connector A (39P).

  1. Measure the resistance between the No. 2 [No. 4] and the No. 3 terminals of the dashboard wire harness 4P connector. There should be less than 1.0 Ω.
    [ ]: KE model
Is the resistance as specified?
YES -
Faulty SRS unit or poor connection at SRS unit connector A (39P) and the SRS unit. Check the connection between the connector and the SRS unit. If the connection is OK, replace the SRS unit.
NO -
Open or increased resistance in the dashboard wire harness; replace the dashboard wire harness.■