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" |
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Clearance warning ECU assembly |
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Clearance warning indicator indicates that front clearance sonar sensor LH and/or RH are frozen |
Clear the sensors surface |
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Proceed to "Front Clearance Sonar Sensor LH Circuit" |
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Proceed to "Front Clearance Sonar Sensor RH Circuit" |
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|
Clearance warning ECU assembly |
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|
Clearance warning indicator indicates rear clearance sonar sensor is frozen |
Clean the sensor surface |
|
|
Proceed to "Rear Clearance Sonar Sensor LH Circuit" |
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|
Proceed to "Rear Clearance Sonar Sensor RH Circuit" |
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Clearance warning ECU assembly |
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|
Clearance warning indicator indicates back sonar sensor is frozen |
Clean the sensor surface |
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|
Proceed to "Back Sonar Sensor LH Circuit" |
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Proceed to "Back Sonar Sensor RH Circuit" |
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|
Clearance warning ECU assembly |
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|
Clearance warning indicator indicates open in front clearance sonar sensor LH and/or RH |
Clean the sensor surface |
|
|
Front Clearance Sonar Sensor LH Circuit |
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Front Clearance Sonar Sensor RH Circuit |
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|
Clearance warning ECU assembly |
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|
Clearance warning indicator indicates open in rear clearance sonar sensor circuit |
Initial check function |
|
|
Proceed to "Rear Clearance Sonar Sensor LH Circuit" |
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Proceed to "Back Sonar Sensor LH Circuit" |
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Proceed to "Back Sonar Sensor RH Circuit" |
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Proceed to "Rear Clearance Sonar Sensor RH Circuit" |
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Clearance warning ECU assembly |
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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" |
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|
Clearance warning ECU assembly |
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System operates even when vehicle speed is 10 km/h (6.2 mph) or more |
Proceed to "Speed Signal Circuit" |
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Clearance warning ECU assembly |
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Indicator does not dim at night, or illuminates dimly during daytime |
Proceed to "Taillight Relay Circuit" |
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Proceed to "Clearance Sonar Main Switch Circuit" |
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Clearance warning ECU assembly |
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|
Detection operation is normal but clearance warning indicator does not illuminate |
Proceed to "Indicator Circuit" |
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|
Combination meter assembly |
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|
Clearance warning ECU assembly |
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|
Detection operation is normal but clearance sonar main switch indicator does not illuminate |
Inspect back sonar or clearance sonar switch assembly |
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|
Proceed to "Indicator Circuit" |
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Clearance warning ECU assembly |
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System operates but clearance warning buzzer does not sound |
Proceed to "Clearance Warning Buzzer Circuit" |
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Replace clearance warning ECU assembly |
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|
Clearance warning buzzer volume is low |
Clearance warning ECU assembly |
|
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Operation Check
OPERATION CHECK
1. CHECK INITIAL CHECK FUNCTION
(a) Check the initial check function for the buzzer.
(1) When the back sonar or clearance sonar switch assembly is turned on, check
that the foll ...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK CLEARANCE WARNING ECU
(a) Disconnect the F95 clearance warning ECU assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table
be ...
Other materials about Toyota 4Runner:
System Description
SYSTEM DESCRIPTION
1. POWER DOOR LOCK CONTROL SYSTEM DESCRIPTION
(a) The power door lock system locks/unlocks all the doors.
The driver and front passenger side door control switches send lock/unlock request
signals to the main body ECU (multiplex network ...
Meter Illumination does not Dim at Night
DESCRIPTION
If the dimmer switch is turned to TAIL, HEAD or AUTO, the main body ECU sends
a TAIL relay signal, panel light illumination signal, panel relay signal and TAIL
cancel OFF signal to the combination meter. Then the meter and accessory meter beco ...
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