LIGHTING SYSTEM > Light Control Switch Circuit

for Preparation Click here


DESCRIPTION

The main body ECU receives light control switch, dimmer switch and front fog light switch information signals from the headlight dimmer switch.

WIRING DIAGRAM


E163074E02


INSPECTION PROCEDURE

1.READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH)

  1. Operate the Techstream according to the display and select the "Data List".

    Main Body 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Dimmer SW
    		Dimmer switch signal / ON or OFF
    		ON: Dimmer switch ON
    OFF: Dimmer switch OFF
    		-
    High Flasher SW
    		Passing light switch signal / ON or OFF
    		ON: Passing light switch ON
    OFF: Passing light switch OFF
    		-
    F Fog Light SW
    		Front fog light switch signal / ON or OFF
    		ON: Front fog light switch ON
    OFF: Front fog light switch OFF
    		-
    Auto Light SW
    		Auto light switch signal / ON or OFF
    		ON: Auto light switch ON
    OFF: Auto light switch OFF
    		-
    Head Light SW
    		Headlight switch signal / ON or OFF
    		ON: Headlight switch ON
    OFF: Headlight switch OFF
    		-
    Tail Light SW
    		Taillight switch signal / ON or OFF
    		ON: Taillight switch ON
    OFF: Taillight switch OFF
    		-

    OK:
    When combination light switch operation is performed, the result will be the same as above.


NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

2.INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
E143952E01

  1. Remove the headlight dimmer switch (Click here).

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

    Standard resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    18 (T) - 12 (EL)
    		Light control switch TAIL
    		Below 1 Ω
    Light control switch HEAD
    20 (H) - 12 (EL)
    		Light control switch HEAD
    19 (A) - 12 (EL)
    		Light control switch AUTO
    4 (BFG) - 3 (LFG)
    		Front fog light switch ON
    17 (HF) - 12 (EL)
    		Dimmer switch High
    11 (HU) - 12 (EL)
    		Dimmer switch Low


NG
REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY (Click here)
OK


3.CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND)

E146047E02

  1. Disconnect the J10 switch connector.

  1. Disconnect the J3, J4 and DD ECU connectors.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J10-4 (BFG) - J3-28 (FFOG)
    		Always
    		Below 1 Ω
    J10-19 (A) - J4-21 (A)
    J10-20 (H) - J3-17 (HEAD)
    J10-18 (T) - J4-23 (TAIL)
    J10-17 (HF) - J4-13 (HF)
    J10-11 (HU) - DD-13 (HU)
    J10-12 (EL) - Body ground
    J10-3 (LFG) - Body ground
    J10-4 (BFG) - Body ground
    		Always
    		10 kΩ or higher
    J10-19 (A) - Body ground
    J10-20 (H) - Body ground
    J10-18 (T) - Body ground
    J10-17 (HF) - Body ground
    J10-11 (HU) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU