Kia Optima: Advanced Driver Assistance System (ADAS) / Cruise Control System (CC)

Kia Optima DL3 2019-2024 Service and Repair Manual / Advanced Driver Assistance System (ADAS) / Cruise Control System (CC)

Description and operation

Cruise Control

The cruise control system is engaged by the cruise "ON/OFF" main switch located on the right-hand side of steering wheel column. The system has the capability to cruise, coast, accelerate and resume speed.

It also has a safety interrupt, engaged upon depressing brake or shifting select lever.

The PCM is the control module for this system. The main components of cruise control system are mode control switches, transmission range switch, brake switch, vehicle speed sensor, PCM and ETC motor that connect throttle body.

The PCM has a low speed limit that prevents system engagement below a minimum speed of 30km/h (18.6mph).

The operation of the controller is controlled by mode control switches located on steering wheel.

Transmission range switch and brake switch are provided to disengage the cruise control system. The switches are on brake pedal bracket and transmission. When the brake pedal is depressed or select lever shifted, the cruise control system is electrically disengaged and the throttle is returned to the idle position.

Cruise main switch (ON/OFF)

The cruise control system is engaged by pressing the cruise "ON/OFF" main switch. Pressing the cruise "ON/OFF" main switch again releases throttle, clears cruise memory speed, and puts vehicle in a non-cruise mode.

Speed down switch

The "Speed down" switch located on right-hand side of steering wheel column.

The coast function - Down the "Speed down" switch and hold it when the cruise control is on. The vehicle will gradually slow down. Release the switch at the desired speed. The desired speed will be maintained.

Down the "" switch and release it quickly. The cruising speed will decrease by 1.0km/h (0.6mph).

Speed up switch

The "Speed up" switch located on right-hand side of steering wheel column

The accel function - Up the "Speed up" switch and hold it when the cruise control is on. The vehicle will gradually accelerate. Release the switch at the desired speed. The desired speed will be maintained.

Up the "Speed up" switch and release it quickly. The cruising speed will increase by 2.0km/h (1.2mph).

RESUME/PAUSE switch

The cruise control system is temporarily disengaged by pushing the "RESUME/PAUSE" switch.

Schematic diagrams

System Block Diagram

Component Parts And Function Outline

Component part		Function
Vehicle-speed sensor, ECS/ABS Control Module		Converts vehicle speed to pulse.
PCM		Receives signals from sensor and control switches.
Cruise control indicator		Illuminates when CRUISE main switch is ON (Built into cluster)
Cruise Control switches	CRUISE switch	Switch for automatic speed control power supply.
	Speed up switch	Controls automatic speed control functions by Speed up/down switch
	Speed down switch
Cancel switches	Cancel switch	Sends cancel signals to PCM.
	Brake-pedal switch
	Transaxle range switch (A/T)
ETC motor		Regulates the throttle valve to the set opening by PCM.

* ETC Motor : Electronic Throttle Control Motor

Troubleshooting

Trouble Symptom Charts

Trouble Symptom 1

Trouble Symptom 2

Trouble symptom	Probable cause	Remedy
The set vehicle speed varies greatly upward or downward "Surging" (repeated alternating acceleration and deceleration) occurs after setting	Malfunction of the vehicle speed sensor circuit	Repair the vehicle speed sensor system, or replace the part
	Malfunction of PCM	Check input and output signals at PCM

Trouble Symptom 3

Trouble symptom	Probable cause	Remedy
The CC system is not canceled when the brake pedal is depressed	Damaged or disconnected wiring of the brake pedal switch	Repair the harness or replace the brake pedal switch
	Malfunction of the PCM signals	Check input and output signals at PCM

Trouble Symptom 4

Trouble symptom	Probable cause	Remedy
The CC system is not canceled when the shift lever is moved to the "N" position (It is canceled, however, when the brake pedal is depressed)	Damaged or disconnected wiring of inhibitor switch input circuit	Repair the harness or repair or replace the inhibitor switch
	Improper adjustment of inhibitor switch
	Malfunction of the PCM signals	Check input and output signals at PCM

Trouble Symptom 5

Trouble symptom	Probable cause	Remedy
Cannot decelerate (coast) by using the "SET/–" switch	Temporary damaged or disconnected wiring of "Speed down" switch input circuit	Repair the harness or replace the "Speed down" switch
Cannot decelerate (coast) by using the "SET/–" switch	Malfunction of the PCM signals	Check input and output signals at PCM

Trouble Symptom 6

Trouble symptom	Probable cause	Remedy
Cannot accelerate or resume speed by using the "RES/+" switch	Damaged or disconnected wiring, or short circuit, or "Speed up" switch input circuit	Repair the harness or replace the "Speed up" switch
	Malfunction of the PCM signals	Check input and output signals at PCM

Trouble Symptom 7

Trouble symptom	Probable cause	Remedy
CC system can be set while driving at a vehicle speed of less than 40km/h (25mph), or there is no automatic cancellation at that speed	Malfunction of the vehicle-speed sensor circuit	Repair the vehicle speed sensor system, or replace the part
	Malfunction of the PCM signals	Check input and output signals at PCM

Trouble Symptom 8

Trouble symptom	Probable cause	Remedy
The cruise main switch indicator lamp does not illuminate (although CC system is normal)	Damaged or disconnected bulb of cruise main switch indicator lamp	Repair the harness or replace the part.
	Harness damaged or disconnected	Repair the harness or replace the part.

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