Section 377 (On-Board Diagnostic (Air Bag System]): Foreword: Flowchart

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Use the following flowchart to verify the cause of the trouble.

NOTE:

When performing the inspection of the past malfunction code, the applicable DTCs may be added to memory by removing or disconnecting the related parts. Inspect only the DTCs that were indicated before inspecting.
When DTCs for a present malfunction are no longer output after present or past malfunctions or both have been repaired, be sure to perform past malfunction display cancellation to prevent repair of malfunctions that have already been repaired.

Fig 1: Troubleshooting Flow Chart
Courtesy of MAZDA MOTORS CORP.