Problem Symptoms Table

NOTE:

When the distance control ECU and/or ECM are replaced with a new one, initialization must be performed.
When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

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	Refer to Cruise Control Switch Circuit
	2. CRUISE main indicator light circuit	Refer to Cruise Main Indicator Light Circuit
	3. ECM	Refer to REMOVAL
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	Refer to Cruise Control Switch Circuit
	2. ECM	Refer to REMOVAL
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	Refer to Cruise Control Switch Circuit
	2. Stop light switch circuit	Refer to DTC P0571: Brake Switch "A" Circuit
	3. Park/Neutral position switch circuit	Refer to Park / Neutral Position Switch Circuit
	4. Vehicle speed sensor circuit	Refer to DTC P0500: Vehicle Speed Sensor Malfunction; DTC P0503: Vehicle Speed Sensor "A" Intermittent / Erratic / High
	5. Transmission control switch circuit	Refer to Transmission Control Switch Circuit
	6. Combination meter system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	7. ECM	Refer to REMOVAL
While vehicle is driven with cruise control, the control is canceled. (CRUISE main indicator light remains on.)	1. Cruise control switch circuit	Refer to Cruise Control Switch Circuit
	2. Vehicle speed sensor circuit	Refer to DTC P0500: Vehicle Speed Sensor Malfunction; DTC P0503: Vehicle Speed Sensor "A" Intermittent / Erratic / High
	3. Stop light switch circuit	Refer to DTC P0571: Brake Switch "A" Circuit
	4. Combination meter system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	5. Park/Neutral position switch circuit	Refer to Park / Neutral Position Switch Circuit
	6. ECM	Refer to REMOVAL
Hunting (Speed is not constant.)	1. Vehicle speed sensor circuit	Refer to DTC P0500: Vehicle Speed Sensor Malfunction; DTC P0503: Vehicle Speed Sensor "A" Intermittent / Erratic / High
Hunting (Speed is not constant.)	2. ECM	Refer to REMOVAL
Vehicle speed setting cannot be canceled. (When coast, acceleration, resume, set speed change function is operated with control switch.)	1. Cruise control switch circuit	Refer to Cruise Control Switch Circuit
	2. ECM	Refer to REMOVAL
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	Refer to ADJUSTMENT
Skid control buzzer does not sound.	1. Buzzer circuit	Refer to Skid Control Buzzer Circuit
	2. VSC system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	3. Distance control ECU power source circuit	Refer to Distance Control ECU Power Source Circuit
	4. Distance control ECU	Refer to REMOVAL
	5. ECM	Refer to REMOVAL
Set distance cannot be changed.	1. Combination meter system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	2. Distance control switch circuit	Refer to Distance Control Switch Circuit
	3. Distance control ECU	Refer to REMOVAL
	4. ECM	Refer to REMOVAL
No information on the display	1. Combination meter system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
No information on the display	2. ECM	Refer to REMOVAL
No brake control (when decelerating)	1. VSC system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	2. Distance control ECU power source circuit	Refer to Distance Control ECU Power Source Circuit
	3. Distance control ECU	Refer to REMOVAL
	4. ECM	Refer to REMOVAL
Constant speed mode cannot be turned on.	1. Cruise control switch circuit	Refer to Cruise Control Switch Circuit
	2. Combination meter system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	3. ECM	Refer to REMOVAL
Vehicle speed cannot be canceled with wiper HI. (Including automatic wiper)	1. Wiper switch circuit	Refer to Wiper and Washer Switch Circuit
	2. Wiper signal circuit	Refer to Wiper Signal Circuit
	3. Washer signal circuit	Refer to Washer Signal Circuit
	4. Distance control ECU	Refer to REMOVAL
	5. ECM	Refer to REMOVAL
When the washer is used, cruise control is canceled.	1. Washer motor circuit	Refer to Washer Motor Circuit
	2. Washer signal circuit	Refer to Washer Signal Circuit
	3. Distance control ECU	Refer to REMOVAL
	4. ECM	Refer to REMOVAL
Unable to adjust (complete) beam axis of millimeter wave radar sensor.	1. Check position, distance and angle of reflector	Refer to ADJUSTMENT
	2. Check installation of millimeter wave radar sensor	Refer to INSTALLATION
	3. Millimeter wave radar sensor	Refer to REMOVAL
	4. Distance control ECU	Refer to REMOVAL
	5. ECM	Refer to REMOVAL
Cannot change from constant speed control mode to vehicle-to-vehicle distance control mode.	1. Cruise control switch circuit	Refer to Cruise Control Switch Circuit
	2. Millimeter wave radar sensor power source circuit	Refer to Millimeter Wave Radar Sensor Power Source Circuit
	3. Distance control ECU	Refer to REMOVAL
	4. ECM	Refer to REMOVAL
The CRUISE main indicator light remains blinking.	1. TC and CG terminal circuit	Refer to TC and CG Terminal Circuit
The CRUISE main indicator light remains blinking.	2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM.	Refer to REMOVAL