How to Troubleshoot the ACC
Adaptive Cruise Control (ACC) Indicator (Orange)
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).
ACC Activation Indicator (Green)
If the ACC system is normal, the indicator comes on when the main switch is ON, and goes off when the main switch is OFF. If the adaptive cruise control (ACC) system malfunctions, the indicator color changes from green to orange.
Self-diagnostic Function
The ACC system has a self-diagnostic function. If the self-diagnostic function detects a malfunction, the ACC system stops control, turns on the ACC indicator (orange), and stores DTCs.
Multi-information Display (MID) Indication
If the ACC system is normal, the ACC indicates its operation on the MID when the main switch is ON.
Adaptive Cruise Control (ACC) Unit
The ACC unit uses input from the millimeter wave radar 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 recognizes the position of the moving vehicle ahead and detects the two vehicles speed differential.
The ACC unit receives this information from the millimeter wave radar.
The millimeter wave radar also detects its own errors, and it signals the ACC unit if an error is detected.
CAN Communication
The ACC unit is on the F-CAN, and it communicates with other units via the F-CAN.
If the ACC unit detects a communication error or a malfunction in another connected unit, the ACC system will not operate even though it is OK.
In this case, both the ACC indicator and the related unit indicator will come on and stay on.
Millimeter Wave Radar Aiming
If the millimeter wave radar is removed or replaced, do the millimeter wave radar aiming procedure. If the aiming is incomplete, the ACC indicator comes on.
How to Retrieve DTCs
  1. With the ignition switch to LOCK (0), connect the HDS to the data link connector (DLC) (A) under the left side of the dashboard.
  1. Turn the ignition switch to ON (II).
  1. Make sure the HDS communicates with the vehicle and the ACC unit. If it does not communicate, troubleshoot the DLC circuit.
  1. 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 to LOCK (0), connect the HDS to the DLC (A) under the left side of the dashboard.
  1. Turn the ignition switch to ON (II).
  1. Make sure the HDS communicates with the vehicle and the ACC unit. If it does not communicate, troubleshoot the DLC circuit.
  1. Clear the DTC(s) by following the screen prompts on the HDS.
    NOTE: See the HDS Help menu for specific instructions.