Air Conditioning System (For Hatchback) Headlight Signal Circuit

Vehicle Interior. Yaris. Ncp93, 131
Heating Air Conditioning. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT HEADLIGHT ASSEMBLY

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

AIR CONDITIONING SYSTEM (for Hatchback) - Headlight Signal Circuit


DESCRIPTION

The air conditioning amplifier assembly receives headlight operational signals to determine electrical load conditions. The electrical load condition signals are used for controlling the number of the PTC heater elements to be heated.

WIRING DIAGRAM


Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan).Air Conditioning System (For Hatchback) Headlight Signal Circuit


INSPECTION PROCEDURE

1.INSPECT HEADLIGHT ASSEMBLY

  1. Check that the headlight comes on when the light control switch is turned to the HEAD position.

    OK:
    The headlight comes on.
    Result
    Result
    		Proceed to
    NG
    		A
    OK (w/ Daytime Running Light System or w/ Theft Deterrent System)
    		B
    OK (w/o Daytime Running Light System and w/o Theft Deterrent System)
    		C


B
Go to step 2

C
Go to step 4
A

GO TO LIGHTING SYSTEM (YARIS_NCP93 RM000000PKJ0AIX.html)

2.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

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

  1. Disconnect the D130 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3A-22 - D130-21 (HLS)
    		Always
    		Below 1 Ω
    3A-22 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.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.Heating Air Conditioning.Air Conditioning System (For Sedan).Air Conditioning System (For Hatchback) Headlight Signal Circuit


    Text in Illustration
    *a
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)
    		-
    		-
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3A-22 - MB-15 (HRLY)
    		Always
    		Below 1 Ω


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000001M2W05EX.html)

4.CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Disconnect the D106 headlight dimmer switch assembly connector.

  1. Disconnect the D130 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D106-20 (H) - D130-21 (HLS)
    		Always
    		Below 1 Ω
    D106-20 (H) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000001M2W05EX.html)