When the ACC system is OK, the ACC indicator comes on for about 2 seconds after turning the ignition switch to ON (II), then it goes off.

When the ACC system detects a problem while in operation, the ACC system stops control, and the ACC indicator comes on and stays on.

NOTE: The ACC system is communicating with the ECM/PCM, the VSA system, and the gauge control module by F-CAN. If a connected unit malfunctions, the ACC system does not operate. In this case, both the ACC indicator and the connected unit indicator come on and stay on (except the gauge control module).