Air Conditioning System (For Sedan) Ig Power Source Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (A/C)

INSPECT AIR CONDITIONING AMPLIFIER

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - MAIN BODY ECU)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND)

AIR CONDITIONING SYSTEM (for Sedan) - IG Power Source Circuit


DESCRIPTION

This is the main power source supplied to the air conditioning amplifier when the ignition switch is turned on. This power source is used for operating components such as the air conditioning amplifier.

WIRING DIAGRAM


Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan).Air Conditioning System (For Sedan) Ig Power Source Circuit


INSPECTION PROCEDURE

HINT:
Start the engine before the inspection. Check the IG1 relay or battery if the engine does not start.
1.INSPECT FUSE (A/C)

  1. Remove the A/C fuse from the main body ECU.

  1. Measure the resistance.

    Standard resistance:
    Bellow 1 Ω

  1. Reinstall the A/C fuse.



NG
REPLACE FUSE
OK


2.INSPECT AIR CONDITIONING AMPLIFIER
Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan).Air Conditioning System (For Sedan) Ig Power Source Circuit

  1. Disconnect the E8 air conditioning amplifier connector.

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E8-8 (IG+) - E8-12 (GND)
    		Ignition switch ON
    		11 to 14 V

  1. Reconnect the air conditioning amplifier connector.



NG
Go to step 3
OK

REPLACE AIR CONDITIONING AMPLIFIER (YARIS_NCP93 RM000001HO100MX.html)

3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - MAIN BODY ECU)
Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan).Air Conditioning System (For Sedan) Ig Power Source Circuit

  1. Disconnect the E8 air conditioning amplifier connector.

  1. Disconnect the 4S main body ECU connector.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E8-8 (IG+) - 4S-10
    		Below 1 Ω

  1. Reconnect the air conditioning amplifier connector.

  1. Reconnect the main body ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND)

  1. Disconnect the E8 air conditioning amplifier connector.



    Yaris. Ncp93, 131.Heating Air Conditioning.Air Conditioning System (For Sedan).Air Conditioning System (For Sedan) Ig Power Source Circuit

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E8-12 (GND) - Body ground
    		Below 1 Ω

  1. Reconnect the air conditioning amplifier connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000001CXV007X.html)