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

Toyota Yaris XP210 (2020-2025) 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.
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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

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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

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