LIGHTING SYSTEM > Daytime Running Light Relay Circuit

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DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights.
The system illuminates the high-intensity LED parking lights (high-intensity circuit).

WIRING DIAGRAM


E222785E02


INSPECTION PROCEDURE

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

1.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 daytime running lights operate.

    Main Body 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Daytime Running Light
    		Daytime running lights
    		ON/OFF
    		-

    OK:
    Daytime running lights illuminate. (LED parking lights illuminate on high-intensity (bright) setting.)



NG
Go to step 2
OK

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

2.INSPECT DRL RELAY

  1. Remove the DRL relay from the engine room relay block.



    E222294E01

  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
    (DRL Relay)



NG
REPLACE DRL RELAY
OK


3.CHECK HARNESS AND CONNECTOR (DRL FUSE - DRL RELAY)

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    Relay Terminal 1 - Body ground
    		Power switch off
    		11 to 14 V
    Relay Terminal 3 - Body ground
    		Power switch off
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (DRL RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH)

  1. Disconnect the A47*1 or A9*2 headlight assembly LH connector.

  1. Disconnect the A48*1 or A38*2 headlight assembly RH connector.

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

    1. *1: for LED headlight
    2. *2: except LED headlight

    Standard Resistance:
    for LED Headlight : 
    Tester Connection
    		Condition
    		Specified Condition
    Relay Terminal 5 - A47-4 (B)
    		Always
    		Below 1 Ω
    Relay Terminal 5 - A48-4 (B)
    		Always
    		Below 1 Ω
    Relay Terminal 5 - Body ground
    		Always
    		10 kΩ or higher
    except LED Headlight : 
    Tester Connection
    		Condition
    		Specified Condition
    Relay Terminal 5 - A9-1 (B)
    		Always
    		Below 1 Ω
    Relay Terminal 5 - A38-1 (B)
    		Always
    		Below 1 Ω
    Relay Terminal 5 - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (DRL RELAY - MAIN BODY ECU)

  1. Disconnect the H16 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
    Relay Terminal 2 - H16-15 (DRL)
    		Always
    		Below 1 Ω
    Relay Terminal 2 - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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