LIGHTING SYSTEM > High Beam Headlight Circuit

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DESCRIPTION

The main body ECU (multiplex network body ECU) controls the high beam headlights.

WIRING DIAGRAM


E223773E02


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK OPERATION (LOW BEAM HEADLIGHTS)

  1. Check the operation of the low beam headlights.

    OK:
    Low beam headlights operate normally.



NG
GO TO PROBLEM SYMPTOMS TABLE
OK


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Main Body / Active Test.

  1. Check that the high beam headlights illuminate.

    Main Body 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Head Light Hi
    		High beam headlights
    		ON/OFF
    		-

    OK:
    High beam headlights illuminate.



NG
Go to step 3
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

3.INSPECT HEADLIGHT DIMMER RELAY (DIM)


    E209495E01

  1. Remove the headlight dimmer relay from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Voltage is not applied between terminals 1 and 2
    		10 kΩ or higher
    3 - 5
    		Voltage is applied between terminals 1 and 2
    		Below 1 Ω

    Text in Illustration 
    *a
    		Component without harness connected
    (Headlight Dimmer Relay)



NG
REPLACE HEADLIGHT DIMMER RELAY
OK


4.CHECK HARNESS AND CONNECTOR (H-LP HI MAIN FUSE - HEADLIGHT DIMMER RELAY)

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    Headlight dimmer relay terminal 2 - Body ground
    		Power switch off
    		11 to 14 V
    Headlight dimmer relay terminal 3 - Body ground
    		Power switch off
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - HEADLIGHT ASSEMBLY)

  1. Disconnect the A8 or A39 headlight assembly connector (for LED headlight).

  1. Disconnect the A10 or A41 headlight assembly connector (except LED headlight).

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

    Standard Resistance:
    for LH side, LED Headlight 
    Tester Connection
    		Condition
    		Specified Condition
    5 - A8-6 (HI)
    		Always
    		Below 1 Ω
    5 - Body ground
    		Always
    		10 kΩ or higher
    A8-5 (E) - Body ground
    		Always
    		Below 1 Ω
    for RH side, LED Headlight 
    Tester Connection
    		Condition
    		Specified Condition
    5 - A39-6 (HI)
    		Always
    		Below 1 Ω
    5 - Body ground
    		Always
    		10 kΩ or higher
    A39-5 (E) - Body ground
    		Always
    		Below 1 Ω
    for LH side, except LED Headlight 
    Tester Connection
    		Condition
    		Specified Condition
    5 - A10-3 (HI)
    		Always
    		Below 1 Ω
    5 - Body ground
    		Always
    		10 kΩ or higher
    A10-5 (E) - Body ground
    		Always
    		Below 1 Ω
    for RH side, except LED Headlight 
    Tester Connection
    		Condition
    		Specified Condition
    5 - A41-3 (HI)
    		Always
    		Below 1 Ω
    5 - Body ground
    		Always
    		10 kΩ or higher
    A41-5 (E) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - MAIN BODY ECU)

  1. Disconnect the 2C main body ECU (multiplex network body ECU) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Headlight dimmer relay terminal 1 - 2C-22
    		Always
    		Below 1 Ω
    2C-22 - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  1. Remove the instrument panel junction block assembly.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2C-22 - A-22 (DIM)
    		Always
    		Below 1 Ω



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)