Lighting System (For Hatchback) High Beam Headlight Circuit

Vehicle Exterior. Yaris. Ncp93, 131
Lighting (Ext). Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM

INSPECT HEADLIGHT DIMMER RELAY (DIM RELAY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - BATTERY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

LIGHTING SYSTEM (for Hatchback) - High Beam Headlight Circuit


DESCRIPTION

The main body ECU controls the high beam headlights.

WIRING DIAGRAM


Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Hatchback) High Beam Headlight Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. According to the display on the Techstream, perform the Active Test.

    Main Body
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Head Light Hi
    		Headlight dimmer relay
    		OFF or ON
    		-
    OK:
    Headlight dimmer relay operates (High beam headlight illuminate.)


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000002CE208CX.html)

2.INSPECT HEADLIGHT DIMMER RELAY (DIM RELAY)

  1. Inspect the headlight dimmer relay (DIM relay) (YARIS_NCP93 RM000001Y5C00VX.html).



NG
REPLACE HEADLIGHT DIMMER RELAY (DIM RELAY)
OK


3.CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - BATTERY)


    Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Hatchback) High Beam Headlight Circuit

  1. Remove the headlight dimmer relay (DIM relay) from the No. 2 engine room relay block.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    DIM-2 - Body ground
    		Always
    		11 to 14 V
    DIM-3 - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *1
    		No. 2 Engine Room Relay Block
    *2
    		Headlight Dimmer Relay (DIM Relay) Holder


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  1. Remove the headlight dimmer relay (DIM relay) from the No. 2 engine room relay block.

  1. Disconnect the 3C instrument panel junction block assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    DIM-1 - 3C-35
    		Always
    		Below 1 Ω
    DIM-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  1. Remove the instrument panel junction block assembly.

  1. Remove the main body ECU from the instrument panel junction block assembly.



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


    Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Hatchback) High Beam Headlight Circuit


    Text in Illustration
    *a
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)
    		-
    		-
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3C-35 - MB-22 (DIM)
    		Always
    		Below 1 Ω


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000002CE208CX.html)