Lighting System (For Hatchback) Taillight Relay Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)

REPLACE MAIN BODY ECU

PERFORM ACTIVE TEST USING TECHSTREAM

LIGHTING SYSTEM (for Hatchback) - Taillight Relay Circuit


DESCRIPTION

The main body ECU controls the TAIL relay.

WIRING DIAGRAM


Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Hatchback) Taillight 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
    Taillight Relay
    		Taillight relay
    		OFF or ON
    		-
    OK:
    TAIL relay operates. (Clearance lights, side marker lights, taillights and license plate lights illuminate.)


NG
Go to step 2
OK

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

2.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)
Yaris. Ncp93, 131.Lighting (Ext).Lighting System (For Sedan).Lighting System (For Hatchback) Taillight Relay Circuit

  1. Disconnect the 3E instrument panel junction block assembly connectors.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    3E-1 - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Instrument Panel Junction Block Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.REPLACE MAIN BODY ECU

  1. Replace the main body ECU (YARIS_NCP93 RM000003TOE00CX.html).


NEXT


4.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
    Taillight Relay
    		Taillight relay
    		OFF or ON
    		-
    OK:
    TAIL relay operates. (Clearance lights, side marker lights, taillights and license plate lights illuminate.)


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK

END (MAIN BODY ECU WAS DEFECTIVE)