Adaptive Cruise Control (ACC) Symptom Troubleshooting Index

WARNING: This page is about a different variant/trim than selected.

NOTE: The ACC system is cancelled when the VSA system is activated.

Symptom	Diagnostic procedure	Also check for
Vehicle speed can be set, but there is no ACC indication on the MID	Do the gauge control module self-diagnostic function .
ACC OFF is displayed on the MID unexpectedly	Check the ACC system auto stop control history .
Vehicle speed cannot be set when the SET switch is pressed between 25 mph (40 km/h) and 90 mph (145 km/h)	Test the ACC combination switch . Test the brake pedal position switch .	An open in the wire A short in the wire The system is in service mode.
Vehicle does not decelerate or accelerate accordingly when the SET- or RES+ switch is pressed	Test the ACC combination switch .	An open in the wire
Set speed does not cancel when the brake pedal is pressed	Test the brake pedal position switch .	An open in the wire
Set speed does not cancel when the MAIN switch is turned off	Test the ACC combination switch .	An open in the wire
Set distance cannot be adjusted with the distance switch	Test the ACC combination switch .
Vehicle speed can be set, but vehicle decelerates	Check for DTCs in the PGM-FI system with the HDS .	Faulty ETCS
ACC indicator (on the MID) does not come on	Symptom troubleshooting .
ACC indicator (on the MID) does not go off, and no DTCs are stored	NOTE: If any of the CAN communication failure DTC is indicated in another system, troubleshoot the DTC first. Check for an open or a short in the F-CAN circuit; - Between the gauge control module and the CAN gateway (F-CAN D_H, F-CAN D_L) - Between the millimeter wave radar and the CAN gateway (F-CAN C_H, F-CAN C_L) Check the millimeter wave radar power circuit (IG1_OPTION). Check the millimeter wave radar ground circuit (GND). Do to the gauge control module self-diagnostic function .	Refer to the followings about the indicator operating condition; General troubleshooting information Refer to the followings about the circuit troubleshooting; Gauge control Module connector for inputs and outputs Millimeter wave radar connector for inputs and outputs Adaptive cruise control (ACC) circuit diagram Fuse to components index Ground to components index
Senses a vehicle driving in another lane	Symptom troubleshooting .	Incorrect millimeter wave radar installation Wheel alignment

Symptom	Diagnostic procedure	Also check for
Does not sense the vehicle driving ahead	Symptom troubleshooting .	Out of the performance limits Wheel alignment Undetectable environment
Intermittently senses the vehicle driving ahead	Symptom troubleshooting .	Incorrect millimeter wave radar installation Wheel alignment Undetectable environment