31-3x

SRS DTC Troubleshooting: 31-3x (x can be 0 thru 9 or A thru F)

DTC 31-3x ("x" can be 0 thru 9 or A thru F):Short to Another Wire or Decreased Resistance in 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, review SRS Precautions and Procedures Service and Repair, General Troubleshooting Information Initial Inspection and Diagnostic Overview, and Battery Terminal Disconnection and Reconnection. Procedures

1. Clear the DTC memory. Initial Inspection and Diagnostic Overview

2. Turn the ignition switch to 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 31-3x indicated?
YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. Initial Inspection and Diagnostic Overview If another DTC is indicated, troubleshoot the DTC.


3. Turn the ignition switch to LOCK (0). Disconnect the negative cable from the battery, then wait for 3 minutes.

4. Disconnect the floor wire harness 2P connector (A) from the driver's side airbag (B).

5. Connect the SRS inflator simulator (2 Ohms connectors) and simulator lead L to the floor wire harness.

6. Reconnect the negative cable to the battery.

7. Clear the DTC memory.

8. Read the DTC. Initial Inspection and Diagnostic Overview

Is DTC 31-3x indicated?
YES - Go to step 9.

NO - Short to another wire in the driver's side airbag inflator; replace the driver's side airbag. Side Airbag Replacement






9. Turn the ignition switch to LOCK (0). Disconnect the negative cable from the battery, then wait for 3 minutes.

10. Disconnect both seat belt tensioner 4P connectors. Service and Repair

11. Disconnect SRS unit connector B (28P) from the SRS unit. Service and Repair

12. Disconnect the SRS inflator simulator from the SRS simulator lead. Do not disconnect the simulator lead from the floor wire harness 2P connector.

13. Connect the SRS short canceller (070AZ-SAA0100) to the terminals No 17 and No. 18 of SRS unit connector B (28P). Service and Repair

14. Measure the resistance between the terminals of the black SRS simulator lead (A). There should be an open circuit or at least 1 MOhms.

Is the resistance as specified?
YES - Faulty SRS unit or poor connection at SRS unit connector B (28P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit. SRS Unit Replacement

NO - Short in the floor wire harness; replace the floor wire harness.