Toyota CH-R Service Manual: Headlight Dimmer Switch Circuit

Toyota CH-R Service Manual / Lighting (ext) / Lighting System / Headlight Dimmer Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives the following switch information:

Light control switch in tail, head or AUTO position
Dimmer switch in high, low or high flash (pass) position
Fog light switch in front or off position*1

*1: w/ Fog Light

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

Click here

*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
Dimmer SW	Dimmer switch high position signal	ON or OFF	ON: Dimmer switch in high or high flash position OFF: Dimmer switch in low position	-
Passing Light SW	Dimmer switch high flash position (pass) signal	ON or OFF	ON: Dimmer switch in high flash position OFF: Dimmer switch not in high flash position	-
Front Fog Light SW	Fog light switch front position signal	ON or OFF	ON: Fog light switch in front position OFF: Fog light switch off	*1
Auto Light SW	Light control switch AUTO position signal	ON or OFF	ON: Light control switch in AUTO position OFF: Light control switch not in AUTO position	-
Head Light SW (Head)	Light control switch head position signal	ON or OFF	ON: Light control switch in head position OFF: Light control switch not in head position	-
Head Light SW (Tail)	Light control switch tail position signal	ON or OFF	ON: Light control switch in tail or head position OFF: Light control switch not in tail or head position	-

*1: w/ Fog Light

Body Electrical > Main Body > Data List

Tester Display
Dimmer SW
Passing Light SW
Front Fog Light SW
Auto Light SW
Head Light SW (Head)
Head Light SW (Tail)

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

HINT:

Inspect the items that did not change when reading the Data List.

(a) Remove the headlight dimmer switch assembly.

Click here

(b) Inspect the headlight dimmer switch assembly.

Click here

REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(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
F24-9 (BFG) - F15-26 (FFOG)*1	Always	Below 1 Ω
F24-14 (HU) - F15-24 (HU)	Always	Below 1 Ω
F24-17 (HF) - F15-10 (HF)	Always	Below 1 Ω
F24-18 (T) - F15-22 (TAIL)	Always	Below 1 Ω
F24-19 (H) - F15-12 (HEAD)	Always	Below 1 Ω
F24-20 (A) - F15-8 (A)	Always	Below 1 Ω
F24-9 (BFG) or F15-26 (FFOG) - Body ground*1	Always	10 kΩ or higher
F24-14 (HU) or F15-24 (HU) - Body ground	Always	10 kΩ or higher
F24-17 (HF) or F15-10 (HF) - Body ground	Always	10 kΩ or higher
F24-18 (T) or F15-22 (TAIL) - Body ground	Always	10 kΩ or higher
F24-19 (H) or F15-12 (HEAD) - Body ground	Always	10 kΩ or higher
F24-20 (A) or F15-8 (A) - Body ground	Always	10 kΩ or higher
F24-15 (EL) - Body ground	Always	Below 1 Ω
F24-8 (LFG) - Body ground*1	Always	Below 1 Ω

*1: w/ Fog Light

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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