DTC 31

Circuit Description
When the ignition switch is turned ON, the sensing and diagnostic module (SDM) will perform tests to diagnose malfunctions within itself.

DTC 31 Will Set When
The SDM does not pass the internal tests.

CAUTION: Before replacing the SDM, disconnect the negative battery cable. Wait 1 minute for the SDM capacitor to discharge. The capacitor supplies reserve power to deploy the airbags, even if the battery is disconnected. Unintentional deployment of the airbags can cause injury.

Step 1:

DTC 31 - SDM INTERNAL FAULT