Cruise Control. Dynamic Radar Cruise Control System Problem Symptoms Table

Cruise Control System. Lexus Is250, Is220D. Gse20 Ale20

Cruise Control. Lexus Is250, Is220D. Gse20 Ale20

Dynamic Radar Cruise Control System -- Problem Symptoms Table

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuse and relay related to this system before inspecting the suspected areas below.

Dynamic Radar Cruise Control System
Symptom	Suspected area	See page
Main switch cannot be turned ON. (CRUISE main indicator light on combination meter does not illuminate.)	1. Cruise control switch circuit	Click here
	2. CRUISE main indicator light circuit	Click here
	3. ECM	Click here
Vehicle speed setting cannot be done. (CRUISE main indicator light on combination meter illuminates when main switch is turned ON, but turns off when operating SET function.)	1. Cruise control switch circuit	Click here
	2. ECM	Click here
Vehicle speed setting cannot be done. (CRUISE main indicator light on combination meter illuminates when main switch is turned ON, and remains on when operating SET function.)	1. Cruise control switch circuit	Click here
	2. Stop light switch circuit	Click here
	3. Park/Neutral position switch circuit	Click here
	4. Shift paddle switch circuit	Click here
	5. Vehicle speed sensor circuit	Click here
	6. Transmission control switch circuit	Click here
	7. Combination meter system	Click here
	8. ECM	Click here
While vehicle is driven with cruise control, the control is canceled. (CRUISE main indicator light remains on.)	1. Cruise control switch circuit	Click here
	2. Vehicle speed sensor circuit	Click here
	3. Stop light switch circuit	Click here
	4. Combination meter system	Click here
	5. Park/Neutral position switch circuit	Click here
	5. Shift paddle switch circuit	Click here
	6. ECM	Click here
Hunting (Speed is not constant.)	1. Vehicle speed sensor circuit	Click here
	2. Malfunction in speed meter circuit	Click here
	3. Millimeter wave radar sensor power source circuit	Click here
	4. Distance control ECU power source circuit	Click here
	5. Distance control ECU	Click here
	6. ECM	Click here
Vehicle speed setting cannot be canceled. (When coast, acceleration, resume, set speed change function is operated with control switch.)	1. Cruise control switch circuit	Click here
	2. ECM	Click here
Erroneous detection or lost sight of the vehicle ahead.	1. Clean radar sensor with soft cloth, etc.	-
Erroneous detection or lost sight of the vehicle ahead.	2. Improper aiming of sensor beam axis	Click here
Alarm buzzer does not sound.	1. Buzzer circuit	Click here
	2. VSC system	Click here
	3. Millimeter wave radar sensor power source circuit	Click here
	4. Distance control ECU power source circuit	Click here
	5. Distance control ECU	Click here
	6. ECM	Click here
Set distance cannot be changed.	1. Combination meter system	Click here
	2. Distance control switch circuit	Click here
	3. Cruise control switch circuit	Click here
	4. Distance control ECU	Click here
	5. ECM	Click here
No information on the display	1. Combination meter system	Click here
No information on the display	2. ECM	Click here
No brake control (when decelerating)	1. VSC system	Click here
	2. Distance control ECU power source circuit	Click here
	3. Distance control ECU	Click here
	4. ECM	Click here
Constant speed mode cannot be turned on.	1. Cruise control switch circuit	Click here
	2. Combination meter system	Click here
	3. ECM	Click here
Vehicle speed cannot be canceled with wiper HI. (Including automatic wiper)	1. Rain sensor system	Click here
	2. Wiper switch circuit	Click here
	3. Distance control ECU	Click here
	4. ECM	Click here
Setting cannot be canceled in SNOW mode.	1. Pattern select switch circuit	Click here
	2. Automatic transmission system	Click here
	3. ECM	Click here
Unable to adjust (complete) beam axis of millimeter wave radar sensor.	1. Check for DTC P1570	Click here
	2. Check position, distance and angle of reflector	Click here
	3. Check installation of millimeter wave radar sensor	Click here
	4. Millimeter wave radar sensor	Click here
	5. Distance control ECU	Click here
	6. ECM	Click here
Cannot change between constant speed control mode and vehicle-to-vehicle distance control mode.	1. Cruise control switch circuit	Click here
	2. Millimeter wave radar sensor power source circuit	Click here
	3. Distance control ECU	Click here
	4. ECM	Click here