DTC 31-3x ("X" can be 0 thru 9 or A thru F): Short to Another Wire or Decreased Resistance in the Driver's Side Airbag Inflator

Special Tools Required

SRS Inflator Simulator 07SAZ-TB4011A
SRS Simulator Lead L 070AZ-SNAA300
SRS Short Canceller 070AZ-SAA0100

NOTE:

Before doing this troubleshooting procedure, find out if the vehicle was in a collision. If so, verify that all the required components were replaced with new components, of the correct part number, and that they were properly installed (see COMPONENT REPLACEMENT/INSPECTION AFTER DEPLOYMENT ).
Before doing this troubleshooting procedure, review SRS Precautions and Procedures (see PRECAUTIONS AND PROCEDURES ), General Troubleshooting Information (see DTC (DIAGNOSTIC TROUBLE CODES) ), and 12 Volt Battery Terminal Disconnection and Reconnection (see 12 VOLT BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
Before replacing the SRS unit, check the SRS unit software version with the HDS. If the software version is not the latest, update the SRS unit software (see SRS UNIT UPDATE ), and retest.

Clear the DTCs with the HDS (see HOW TO CLEAR DTCS ).
Turn the ignition switch to ON (II), then wait for 10 seconds.
Check for DTCs with the HDS (see HOW TO CLEAR DTCS ).
Is DTC 31-3x 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.
Turn the ignition switch to LOCK (0).
Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.
Disconnect the driver's side airbag inflator 2P connector (A) on the floor wire harness.

Fig 1: Disconnecting Driver's Side Airbag Inflator 2P Connector On Floor Wire Harness
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Connect the terminals of SRS simulator lead L to the SRS inflator simulator (2 Ω connectors), and then connect the SRS simulator lead L to the driver's side airbag inflator 2P connector on the floor wire harness.
Reconnect the negative cable to the 12 volt battery.
Clear the DTCs with the HDS (see HOW TO CLEAR DTCS ).
Turn the ignition switch to ON (II), then wait for 10 seconds.
Check for DTCs with the HDS (see HOW TO CLEAR DTCS ).
Is DTC 31-3x indicated?

YES -Go to step 12.

NO -Short to another wire in the driver's side airbag inflator; replace the driver's side airbag (see SIDE AIRBAG REPLACEMENT ), then clear the DTC.
Turn the ignition switch to LOCK (0).
Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.
Disconnect SRS unit connector B (39P) from the SRS unit (see step 10 ).
Disconnect the SRS inflator simulator from the SRS simulator lead L. Do not disconnect the SRS simulator lead L from the driver's side airbag inflator 2P connector on the floor wire harness.
Connect an SRS short canceller (070AZ-SAA0100) to SRS unit connector B (39P) terminals No. 28 and No. 29 (see OPENING THE SRS UNIT SHORTING CONNECTORS FOR DIAGNOSIS ).
Measure the resistance between the SRS simulator lead L (A) black terminals.

Fig 2: Measuring Resistance Between SRS Simulator Lead L Black Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there an open circuit or at least 1 MΩ?

YES -Faulty SRS unit or poor connection at SRS unit connector B (39P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit (see SRS UNIT REPLACEMENT ). If the DTC does not clear, replace the floor wire harness.

NO -Short to another wire in the floor wire harness; replace the floor wire harness, then clear the DTC.