Toyota Yaris: Lighting System / Automatic High Beam Switch Indicator does not Come ON

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System / Automatic High Beam Switch Indicator does not Come ON

DESCRIPTION

When the automatic high beam system is on, the main body ECU (multiplex network body ECU) illuminates the auto high beam switch indicator.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Diagnostic Note
Automatic High Beam Switch Light	Auto high beam switch indicator light	OFF or ON	-

Body Electrical > Main Body > Data List

Tester Display
Automatic High Beam Switch Light

OK:

Auto high beam switch indicator light illuminates.

USE SIMULATION METHOD TO CHECK

2.	INSPECT AUTO HIGH BEAM SWITCH

Click here

REPLACE AUTO HIGH BEAM SWITCH

3.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - AUTO HIGH BEAM SWITCH)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
H47-3 (IND+) - Body ground	Ignition switch off	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the H4 main body ECU (multiplex network body ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H47-4 (AZBI) - H4-15 (AHID)	Always	Below 1 Ω
H47-4 (AZBI) or H4-15 (AHID) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Turn Signal Switch Circuit

DESCRIPTION The steering sensor receives the turn signal switch information and controls the turn signal lights. WIRING DIAGRAM PROCEDURE 1. READ VALUE USING GTS (a) Read the Data List according to the display on the GTS...

Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

DESCRIPTION The main body ECU (multiplex network body ECU) controls the automatic high beam system based on signals received from the forward recognition camera...

Other information:

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual: Headlight LH Circuit (B243900,B243A00)

DESCRIPTION The light control LED ECU supplies internally boosted voltage to the light control LED ECU LH so that the current supplied to the LED is always maintained at a constant value. These DTCs are also output when the main body ECU (multiplex network body ECU) detects malfunctions while monitoring the applied voltage...

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual: Components

C..