SRS System

Control System DTCs

SRS DTC Troubleshooting: 31-3x

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 Service and Repair.
* Before doing this troubleshooting procedure, review SRS Precautions and Procedures Service and Repair, General Troubleshooting Information Reading and Clearing Diagnostic Trouble Codes, and Battery Terminal Disconnection and Reconnection Procedures.
* 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 Programming and Relearning, and retest.


1. Problem verification:

-1. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

-2. Turn the ignition switch to ON (II), then wait for 10 seconds.

-3. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

Is DTC 31-3x indicated?
-YES- The failure is duplicated. Go to step 2.
-NO- Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures Reading and Clearing Diagnostic Trouble Codes. If another DTC is indicated, troubleshoot the DTC.

2. Driver's side airbag inflator check:

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the negative cable from the battery, then wait at least 3 minutes.

-3. Disconnect the driver's side airbag inflator 2P connector (A) on the floor wire harness.






-4. Connect the terminals of SRS simulator lead L to the SRS inflator simulator (2 Ohms connectors), then connect SRS simulator lead L to the driver's side airbag inflator 2P connector on the floor wire harness.

-5. Reconnect the negative cable to the battery.

-6. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

-7. Turn the ignition switch to ON (II), then wait for 10 seconds.

-8. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

Is DTC 31-3x indicated?
-YES- Go to step 3.
-NO- Short to another wire in the driver's side airbag inflator; replace the driver's side airbag Side Airbag Removal And Installation, then clear the DTC.

3. Shorted wire check (LSA+ line to LSA- line):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the negative cable from the battery, then wait at least 3 minutes.

-3. Disconnect the following connector.






-4. Disconnect the SRS inflator simulator from SRS simulator lead L. Do not disconnect SRS simulator lead L from the driver's side airbag inflator 2P connector on the floor wire harness.

-5. Connect the SRS short canceller to SRS unit connector B (39P) terminals No. 5 and No. 6 Reading and Clearing Diagnostic Trouble Codes.

-6. Measure the resistance of the test point.










Is there an open circuit, or at least 1 MOhms?
-YES- The LSA+, LSA- wires are OK. 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 Service and Repair. 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.