Kia Optima: 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 |
|
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 |
BCW & RCCA Indicator
Repair procedures
Inspection
1.
Remove the front door trim.
(Refer to Body - "Frond Door Trim")
2.
Check that the mirror operates prop ...
Cruise Control (CC) Switch
Components and components location
Components
1. Left remote control switch
(Audio + Bluetooth + Voice)
2. Right remote control switch
(Trip + SCC + LFA)
...
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