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.

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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.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

INSPECT AUTO HIGH BEAM SWITCH

Click here

NG

REPLACE AUTO HIGH BEAM SWITCH

OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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