Diag.Code 31 Center Airbag Sensor Assembly Malfunction CIRCUIT DESCRIPTION The center airbag sensor assembly consists of a center airbag sensor, safing sensors, ignition control and drive circuit, diagnosis circuit, etc. It receives signals from the airbag sensors, judges whether or not the airbag must be activated, and diagnoses system malfunction. Diagnostic code 31 is recorded when occurrence of a malfunction in the center airbag sensor assembly is detected. Code No. Diagnosis 31 · Center airbag sensor assembly malfunction. DIAGNOSTIC CHART HINT: When a malfunction code other than code 31 is displayed at the same time, first repair the malfunction indicated by the malfunction code other than code 31. 1 Is diagnostic code 31 output again? NO → Using simulation method, reproduce malfunction symptoms (See page AB-32). ↓ YES ↓ Replace center airbag sensor assembly.