Toyota Yaris: Lighting System / Problem Symptoms Table

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
If the windshield glass is dirty, fogged up or has an oily film, the forward recognition camera may not operate properly, affecting the operation of systems that use the forward recognition camera.*1
- *1: w/ Toyota Safety Sense
When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera*1 will not match the information from the vehicle. As a result, a DTC may be stored.
- *1: w/ Toyota Safety Sense
If the forward recognition camera*1 has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.
for one time recognition: Click here

for sequential recognition: Click here

for driving adjustment: Click here
- *1: w/ Toyota Safety Sense

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.

Headlight

Symptom	Suspected Area	Link
Left low beam headlight does not illuminate	Refer to "LO-beam Headlight does not Illuminate"
Right low beam headlight does not illuminate	Refer to "LO-beam Headlight does not Illuminate"
Both left and right low beam headlights do not illuminate	Headlight dimmer switch circuit
	CAN communication system
	Main body ECU (Multiplex network body ECU)
	CXPI communication system
	Semiconductor power integration ECU
Left high beam headlight does not illuminate	High Beam Headlight Circuit
Left high beam headlight does not illuminate	Harness or connector	-
Right high beam headlight does not illuminate	High Beam Headlight Circuit
Right high beam headlight does not illuminate	Harness or connector	-
Both left and right high beam headlights do not illuminate	Headlight dimmer switch circuit
	CAN communication system
	Main body ECU (Multiplex network body ECU)
	CXPI communication system
	Semiconductor power integration ECU
High Flash (passing function) does not operate (high beam headlights are normal)	Headlight dimmer switch circuit
	CAN communication system
	Main body ECU (Multiplex network body ECU)
	CXPI communication system
	Semiconductor power integration ECU

Clearance Light

Symptom	Suspected Area	Link
Clearance light does not illuminate	Clearance Light/Daytime Running Light Circuit
Clearance light does not illuminate	Harness or connector	-

Taillight

Symptom	Suspected Area	Link
Left or right taillight does not illuminate	Tail light LED
Left or right taillight does not illuminate	Harness or connector	-
All of the taillights, clearance lights and license plate lights do not illuminate	Headlight dimmer switch circuit
	Taillight Relay Circuit
	Harness or connector	-

License Plate Light

Symptom	Suspected Area	Link
Left or right license plate light does not illuminate	License plate light bulb
Left or right license plate light does not illuminate	Harness or connector	-
Both left and right license plate lights do not illuminate	Taillight Relay Circuit
Both left and right license plate lights do not illuminate	Harness or connector	-

Stop Light

Symptom	Suspected Area	Link
Left or right stop light does not illuminate	Stop light LED
Left or right stop light does not illuminate	Harness or connector	-
All of the stop lights do not illuminate	STOP fuse	-
	Stop light switch assembly
	Harness or connector	-

High Mounted Stop Light

Symptom	Suspected Area	Link
High mounted stop light does not illuminate	Center stop light assembly
High mounted stop light does not illuminate	Harness or connector	-

Front Fog Light

Symptom	Suspected Area	Link
Left or right front fog light does not illuminate	Fog light assembly	-
Left or right front fog light does not illuminate	Harness or connector	-
Both left and right front fog lights do not illuminate (taillights are normal)	Headlight dimmer switch circuit
	Front fog light circuit
	Harness or connector	-

Rear Fog Light

Symptom	Suspected Area	Link
Rear fog light does not illuminate	Rear fog light LED
	Headlight dimmer switch circuit
	Rear fog light circuit
	Harness or connector	-

Back-up Light

Symptom	Suspected Area	Link
Back-up light does not illuminate	Back-up light LED
	Back-up light switch assembly
	Harness or connector	-

Turn Signal Light

Symptom	Suspected Area	Link
Left or right front turn signal light does not operate	Headlight lens sub-assembly
	Wire harness
	Harness or connector	-
Left or right side turn signal light does not operate	Side turn signal light assembly
	Outer rear view mirror assembly
	Harness or connector	-
Left or right rear turn signal light does not operate	Rear turn signal light LED
Left or right rear turn signal light does not operate	Harness or connector	-
Turn signal lights do not operate in one direction	Turn signal switch circuit
Turn signal lights do not operate in one direction	Meter/gauge system
All turn signal lights do not operate	Turn signal switch circuit
All turn signal lights do not operate	Meter/gauge system
All turn signal lights do not flash at the correct speed	Combination meter assembly

Hazard Warning Signal Light

Symptom	Suspected Area	Link
Hazard warning signal lights do not operate	Hazard warning switch circuit
Hazard warning signal lights do not operate	Combination meter assembly

Automatic Light Control System

Symptom	Suspected Area	Link
Automatic light control system does not operate	Headlight dimmer switch circuit
Automatic light control system does not operate	Main body ECU (Multiplex network body ECU)

Light Auto Turn-off System

Symptom	Suspected Area	Link
Light auto turn-off system does not operate	Headlight dimmer switch circuit
	IG signal circuit
	Front door courtesy switch circuit
	Main body ECU (Multiplex network body ECU)

Daytime Running Light System

Symptom	Suspected Area	Link
Left or right daytime running light does not illuminate	Clearance Light/Daytime Running Light Circuit
Left or right daytime running light does not illuminate	Harness or connector	-
Both left and right daytime running lights do not illuminate	Headlight dimmer switch circuit
	IG signal circuit
	CAN communication system
	Main body ECU (Multiplex network body ECU)
	CXPI communication system
	Semiconductor power integration ECU

Manual Headlight Beam Level Control System

Symptom	Suspected Area	Link
Headlight beam level control does not operate	Headlight leveling switch
	Harness or connector	-
	Headlight leveling motor

Automatic High Beam System (w/ Toyota Safety Sense)

Symptom	Suspected Area	Link
Automatic high beam system does not operate or automatic high beam indicator does not illuminate (low beam headlights and high beam headlights are normal)	Check Data List (Front Recognition Camera High Temperature 2)
	Check automatic high beam indicator light
	Check Data List (Auto High Beam Main Switch)
	Check Data List (Auto H Beam STS0)
	Perform Active Test (Automatic High Beam Indicator (Green))
	Auto high beam switch
	Harness or connector
	Combination meter assembly
	Forward recognition camera
	Main body ECU (Multiplex network body ECU)
Auto high beam switch indicator does not come ON	Refer to "Automatic High Beam Switch Indicator does not Come ON"

Extended Headlight Lighting

Symptom	Suspected Area	Link
Follow me home system does not operate	Check customize parameters (Follow Me Home Lighting Time)
Follow me home system does not operate	Main body ECU (Multiplex network body ECU)

Customize Parameters

CUSTOMIZE PARAMETERS CUSTOMIZE LIGHTING SYSTEM (EXT) NOTICE: When the customer requests a change in a function, first make sure that the function can be customized...

Terminals Of Ecu

TERMINALS OF ECU *1 Power Distribution Box Assembly *2 Main Body ECU (Multiplex Network Body ECU) CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY (a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly...

Other information:

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Inspection

INSPECTION PROCEDURE 1. INSPECT TURBOCHARGER SUB-ASSEMBLY (a) Check if the compressor side impeller and exhaust side turbine are damaged or defective. HINT: Wear on the center of the exhaust side turbine is not a malfunction. *a Compressor Side Impeller *b Exhaust Side Turbine *c Center of Exhaust Side Turbine (b) Move the rod by hand and check that the waste gate valve is not stuck...

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Diagnosis System

DIAGNOSIS SYSTEM FUNCTION OF WARNING INDICATOR AND MESSAGE (a) If the pre-collision system is not functioning properly, the driver is warned by the PCS warning light and a warning message is displayed on the multi-information display. Warning Message Detail DTC/RoB PCS warning light "Pre-Collision System Malfunction Visit Your Dealer" Pre-collision system malfunctioning Stored Illuminates "Pre-Collision System Radar In Self Calibration Unavailable See Owner's Manual" Millimeter wave radar sensor assembly misaligned Stored Illuminates "Pre-Collision System Out of Temperature Range Unavailable See Owner's Manual" Millimeter wave radar sensor assembly temperature malfunction Stored Illuminates "Pre-Collision System Unavailable See Owner's Manual" Millimeter wave radar sensor assembly voltage malfunction Determination was made for temporary suspension of system operation due to millimeter wave radar sensor assembly detecting interference from other nearby radar emitters Stored Illuminates "Pre-Collision System Radar Sensor Blocked Unavailable Clean Radar Sensor" Foreign matter attached to millimeter wave radar sensor assembly Stored Illuminates "Front Camera Unavailable See Owner's Manual" Abnormal forward recognition camera voltage Stored Illuminates "Front Camera Out of Temperature Range Unavailable Wait until Normal Temperature" Forward recognition camera temperature outside of operational range Stored Illuminates "Front Camera Low Visibility Unavailable See Owner's Manual" Foreign matter attached to forward recognition camera or area of windshield in front of forward recognition camera Forward recognition camera or area of windshield in front of forward recognition camera is fogged up Stored Illuminates "VSC Turned Off Pre-Collision Brake System Unavailable" VSC system is disabled Not stored Illuminates PCS Warning Light Illumination Status PCS Warning Light Condition Illuminates Pre-collision system malfunctioning Pre-collision system temporarily disabled During pre-collision system radar alignment Pre-collision system disabled VSC system disabled Not illuminated Other INITIAL CHECK (a) An initial check is performed when the ignition switch is off for more than 2 seconds and then turned ON...

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