Lighting System (For Hatchback) Daytime Running Light Relay Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM

CHECK HEADLIGHT

INSPECT RUNNING LIGHT RELAY

CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

LIGHTING SYSTEM (for Hatchback) - Daytime Running Light Relay Circuit


DESCRIPTION

The main body ECU controls the daytime running lights (dimmed low beam headlights).
HINT:
  1. The running light relay has a headlight control function. This function dims the low beam headlights in accordance with operation signals from the main body ECU while the daytime running light system is operating.
  2. The running light relay dims the low beam headlights using a duty control.

WIRING DIAGRAM


Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Hatchback) Daytime Running Light Relay 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
    Daytime Running Light
    		Running light relay
    		OFF or ON
    		-
    OK:
    Running light relay operates. (Daytime running lights illuminate.)


NG
Go to step 2
OK

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

2.CHECK HEADLIGHT

  1. Check the operation of the low beam headlights.

    OK:
    Low beam headlights operate normally.


NG
GO TO PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000002CE208CX.html)
OK


3.INSPECT RUNNING LIGHT RELAY


    Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Hatchback) Daytime Running Light Relay Circuit

  1. Remove the running light relay from the No. 2 engine room relay block.

  1. Connect a positive (+) lead from the battery to terminal 6 (+B).

  1. Connect a negative (-) lead from the battery to terminal 2 (DRLS) and 3 (E).

  1. Check for pulses according to the value(s) in the table below.

    OK:
    Tester Connection
    		Condition
    		Specified Condition
    1 (HLOR) - Battery negative terminal
    		Always
    		Pulse generation
    5 (HLOL) - Battery negative terminal
    		Always
    		Pulse generation
    Text in Illustration
    *a
    		Component without harness connected
    (Running Light Relay)


NG
REPLACE RUNNING LIGHT RELAY (YARIS_NCP93 RM000004WXO001X.html)
OK


4.CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  1. Remove the running light relay from the No. 2 engine room relay block assembly.

  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
    DRL-2 (DRLS) - 3C-22
    		Always
    		Below 1 Ω
    DRL-2 (DRLS) - 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) Daytime Running Light Relay Circuit


    Text in Illustration
    *a
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)
    		-
    		-
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3C-22 - MB-25 (DRL)
    		Always
    		Below 1 Ω


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK

REPLACE MAIN BODY ECU (YARIS_NCP93 RM000003TOE00CX.html)