Hyundai Sonata LF: Cruise Control System / Cruise Control Switch Schematic Diagrams

Troubleshooting

Trouble Symptom Charts Trouble Symptom 1 Trouble Symptom 2 Trouble symptomProbable causeRemedyThe set vehicle speed varies greatly upward or downward"Surging" (repeated alternating acceleration and deceleration) occurs after settingMalfunction of the vehicle speed sensor circuitRepair the vehicle speed sensor system, or replace the partMalfunction of ECMCheck input and output signals at ECM Trouble Symptom 3 Trouble symptomProbable causeRemedyThe CC system is not canceled when the brake pedal is depressedDamaged or disconnected wiring of the brake pedal switchRepair the harness or replace the brake pedal switchMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 4 Trouble symptomProbable causeRemedyThe 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 circuitRepair the harness or repair or replace the inhibitor switchImproper adjustment of inhibitor switchMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 5 Trouble symptomProbable causeRemedyCannot decelerate (coast) by using the "SET/–" switchTemporary damaged or disconnected wiring of "SET/–" switch input circuitRepair the harness or replace the "SET/–" switchMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 6 Trouble symptomProbable causeRemedyCannot accelerate or resume speed by using the "RES/+" switchDamaged or disconnected wiring, or short circuit, or "RES/+" switch input circuitRepair the harness or replace the "RES/+" switchMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 7 Trouble symptomProbable causeRemedyCC system can be set while driving at a vehicle speed of less than 40km/h (25mph), or there is no automatic cancellation at that speedMalfunction of the vehicle-speed sensor circuitRepair the vehicle speed sensor system, or replace the partMalfunction of the ECM signalsCheck input and output signals at ECM Trouble Symptom 8 Trouble symptomProbable causeRemedyThe cruise main switch indicator lamp does not illuminate (But CC system is normal)Damaged or disconnected bulb of cruise main switch indicator lampRepair the harness or replace the part...

Cruise Control Switch Repair procedures

Inspection [Measuring Resistance] 1. Disconnect the cruise control switch connector from the control switch. 2. Measure resistance between terminals on the control switch when each function switch is ON (switch is depressed)...

Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Water pump Repair procedures

Removal 1. Loosen the drain plug (A), and drain the engine coolant. Remove the radiator cap to drain with speed.     System is under high pressure when the engine is hot.To avoid danger of releasing scalding engine coolant, remove the cap only when the engine is cool...

Hyundai Sonata LF 2014-2019 Service Manual: Relay Box (Passenger Compartment) Description and Operation

Description Auto Cut System Of Dark Current AbbreviationExpalnationACUAirbag Control UnitADMAssist Door ModuleB_CANBody Controller Area NetworkBCMBody Control ModuleBSDBlind Spot DetectionC_CANChassis Controller Area NetworkCLUCluster ModuleDATCDual Automatic Temp ControlDDMDriver Door ModuleESCElectronic Stability ProgramEMSEngine Management SystemLDWSLane Departure Warning SystemM_CANMulti media Controller Area NetworkMDPSMotor Driven Power SteeringP_CANPowertrain Controller Area NetworkPSMPower Seat ModuleSASSteering Angle SensorSJBSmart Junction BlockSMKSmart Key UnitSPASSmart Parking Assist SystemTCUTransmission Control UnitTPMSTire Pressure Monitoring SystemVDCVehicle Dynamic ControlTMUTelematics SystemABSAnti-lock Brake SystemSCCSmart Cruise Control Smart Junction Block (SJB) General function : Interior Junction Block + some functions of BCM It controls loads with CAN communication and IPS...