Toyota CH-R Service Manual: Automatic High Beam Switch Circuit

Toyota CH-R Service Manual / Lighting (ext) / Automatic High Beam System / Automatic High Beam Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects auto high beam switch signals. The automatic high beam system can be turned on and off by operating the integration control and panel assembly (automatic high beam switch).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to refer to registration.*1

*1: w/ Smart Key System

PROCEDURE

1.	READ VALUE USING Techstream

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Auto High Beam Main Switch	Auto high beam switch signal	ON or OFF	ON: Auto high beam switch pressed OFF: Auto high beam switch not pressed	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Auto High Beam Main Switch

Auto high beam switch signal

ON or OFF

ON: Auto high beam switch pressed

OFF: Auto high beam switch not pressed

Body Electrical > Main Body > Data List

Tester Display
Auto High Beam Main Switch

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT AUTO HIGH BEAM SWITCH

(a) Remove the auto high beam switch.

Click here

(b) Inspect the auto high beam switch.

Click here

OK:

Auto high beam switch is normal.

REPLACE AUTO HIGH BEAM SWITCH

3.	CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the F15 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
F6-6 (+B) - F15-17 (AHBI)	Always	Below 1 Ω
F6-6 (+B) or F15-17 (AHBI) - Body ground	Always	10 kΩ or higher
F6-3 (E) - Body ground	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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Automatic Light Control Sensor

...

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Toyota CH-R Service Manual: Automatic High Beam Switch Circuit

Lost Communication with Front Camera Module (U023A)

Automatic Light Control Sensor

Other materials:

Toyota C-HR (AX20) 2023-2025 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual