How to Troubleshoot the Adaptive Cruise Control

Adaptive Cruise Control (ACC) Indicator (Orange) When the adaptive cruise control (ACC) system is OK, the adaptive cruise control (ACC) indicator comes on for about 2 seconds after turning the ignition switch ON (II), then it goes off. When the adaptive cruise control (ACC) system detects a problem while in operation, the adaptive cruise control (ACC) system stops control, and the adaptive cruise control (ACC) indicator comes on and stays on.
NOTE: The adaptive cruise control (ACC) system is communicating with the PCM, the VSA system, and the gauge control module by F-CAN. If a connected unit malfunctions, the adaptive cruise control (ACC) system does not operate. In this case, both the adaptive cruise control (ACC) indicator and the connected unit indicator come on and stay on (except the gauge control module).

Adaptive Cruise Control (ACC) Activation Indicator (Green) If the adaptive cruise control (ACC) system is normal, the indicator comes on when the adaptive cruise control (ACC) switch is ON, and goes off when the adaptive cruise control (ACC) switch is OFF. If the adaptive cruise control (ACC) system malfunctions, the indicator color changes from green to orange. |

Self-diagnostic Function The adaptive cruise control (ACC) system has a self-diagnostic function. If the self-diagnostic function detects a malfunction, the adaptive cruise control (ACC) system stops control, turns on the adaptive cruise control (ACC) indicator, and stores DTCs. |

Multi-information Display (MID) Indication If the adaptive cruise control (ACC) system is normal, the adaptive cruise control (ACC) indicates its operation on the multi-information display (MID) when the adaptive cruise control (ACC) switch is ON. |

Adaptive Cruise Control (ACC) Unit The adaptive cruise control (ACC) unit uses input from the millimeter wave radar unit to control the vehicle's speed and brakes to maintain a constant distance between the vehicle and other moving vehicles directly ahead. |

Millimeter Wave Radar The millimeter wave radar unit recognizes the position of the moving vehicle ahead and detects the two vehicles speed differential. The adaptive cruise control (ACC) unit receives this information from the millimeter wave radar unit.
The millimeter wave radar unit also detects its own errors, and it signals the adaptive cruise control (ACC) unit if an error is detected.

CAN Communication The adaptive cruise control (ACC) unit is on the F-CAN, and it communicates with other units via the F-CAN. If the adaptive cruise control (ACC) unit detects a communication error or a malfunction in another connected unit, the adaptive cruise control (ACC) system will not operate even though it is OK.
In this case, both the adaptive cruise control (ACC) indicator and the related unit indicator will come on and stay on.

Millimeter Wave Radar Aiming If the millimeter wave radar unit is removed or replaced, do the millimeter wave radar aiming procedure. If the aiming is incomplete, the adaptive cruise control (ACC) indicator comes on. |

How to Retrieve DTCs

1. With the ignition switch OFF, connect the HDS to the data link connector (DLC) (A) under the left side of the dashboard.

1. Turn the ignition switch ON (II), and follow the prompts on the HDS to display the DTC(s) on the screen. After determining the DTC, refer to the DTC Troubleshooting.
   NOTE: See the HDS Help menu for specific instructions.

How to Clear DTCs NOTE: You cannot clear the DTCs manually.

1. With the ignition switch OFF, connect the HDS to the data link connector (DLC) (A) under the left side of the dashboard.

1. Turn the ignition switch ON (II), and clear the DTC(s) by following the screen prompts on the HDS.
   NOTE: See the HDS Help menu for specific instructions.