Self-Diagnostic Function: Notes

The OnStar system has a self-diagnostic function.

The self-diagnostic function is performed when the ignition switch is turned ACC (I) or ON (II).

NOTE: Most items are checked with ACC (I) except the Collision Detection Signal.

Fig 1: Self-Diagnostic Function Chart

Courtesy of AMERICAN HONDA MOTOR CO., INC.

The OnStar control unit will store the DTCs when failures have been found in the self-diagnostic function mode. The red LED will be turned ON at the same time.