Toyota 4Runner: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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.

Intuitive Parking Assist System

Symptom	Suspected Area	See page
System does not operate at all (Initial check function also does not operate)	Proceed to "Clearance sonar main switch circuit"
	Clearance warning ECU assembly
Clearance warning indicator indicates that front clearance sonar sensor LH and/or RH are frozen	Clear the sensors surface
	Proceed to "Front Clearance Sonar Sensor LH Circuit"
	Proceed to "Front Clearance Sonar Sensor RH Circuit"
	Clearance warning ECU assembly
Clearance warning indicator indicates rear clearance sonar sensor is frozen	Clean the sensor surface
	Proceed to "Rear Clearance Sonar Sensor LH Circuit"
	Proceed to "Rear Clearance Sonar Sensor RH Circuit"
	Clearance warning ECU assembly
Clearance warning indicator indicates back sonar sensor is frozen	Clean the sensor surface
	Proceed to "Back Sonar Sensor LH Circuit"
	Proceed to "Back Sonar Sensor RH Circuit"
	Clearance warning ECU assembly
Clearance warning indicator indicates open in front clearance sonar sensor LH and/or RH	Clean the sensor surface
	Front Clearance Sonar Sensor LH Circuit
	Front Clearance Sonar Sensor RH Circuit
	Clearance warning ECU assembly
Clearance warning indicator indicates open in rear clearance sonar sensor circuit	Initial check function
	Proceed to "Rear Clearance Sonar Sensor LH Circuit"
	Proceed to "Back Sonar Sensor LH Circuit"
	Proceed to "Back Sonar Sensor RH Circuit"
	Proceed to "Rear Clearance Sonar Sensor RH Circuit"
	Clearance warning ECU assembly
Clearance sonar sensors operate when shift lever is not in R, or do not operate even when shift lever is in R	Proceed to "Park/Neutral Position Switch Circuit"
	Clearance warning ECU assembly
System operates even when vehicle speed is 10 km/h or more	Proceed to "Speed Signal Circuit"
System operates even when vehicle speed is 10 km/h or more	Clearance warning ECU assembly
Indicator does not dim at night, or illuminates dimly during daytime	Proceed to "Taillight Relay Circuit"
	Proceed to "Clearance Sonar Main Switch Circuit"
	Clearance warning ECU assembly
Detection operation is normal but clearance warning indicator does not illuminate	Proceed to "Indicator Circuit"
	Combination meter assembly
	Clearance warning ECU assembly
Detection operation is normal but clearance sonar main switch indicator does not illuminate	Inspect back sonar or clearance sonar switch assembly
	Proceed to "Indicator Circuit"
	Clearance warning ECU assembly
System operates but clearance warning buzzer does not sound	Proceed to "Clearance Warning Buzzer Circuit"
System operates but clearance warning buzzer does not sound	Replace clearance warning ECU assembly
Clearance warning buzzer volume is low	Clearance warning ECU assembly

Problem Symptoms Table

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