AIR CONDITIONING SYSTEM IG Power Source Circuit

DESCRIPTION

The main power source is supplied to the air conditioning amplifier when the engine switch is on (IG).

The power source is used for operating the air conditioning amplifier and servo motor, etc.

WIRING DIAGRAM

A001FT3E02
*a Main Body ECU
*b FGND
*c Battery
*d Air Conditioning Amplifier

CAUTION / NOTICE / HINT

Tech Tips

Start the engine before inspection. Check the P-IG1 relay or battery if the smart access system with push-button start does not start.

PROCEDURE


  1. INSPECT FUSE (P-IG1-1)


    1. Remove the P-IG1-1 fuse from the passenger side junction block.

    2. Measure the resistance of the fuse.

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      P-IG1-1 Fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK AIR CONDITIONING AMPLIFIER (IG+ VOLTAGE)

    A001FJNE03
    *1 Component with harness connected: (Air Conditioning Amplifier)
    *2 FGND

    1. Remove the air conditioning amplifier with its connectors still connected Click here.

    2. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L76-5 (IG+) - L76-1 (GND) Engine switch on (IG) 11 to 14 V
      L76-5 (IG+) - L76-2 (FGND) Engine switch on (IG) 11 to 14 V
      L76-5 (IG+) - L77-6 (RGND) Engine switch on (IG) 11 to 14 V

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

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

    A001C0XE03
    *1 FGND

    1. Disconnect the L76 and L77 air conditioning amplifier connectors.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L76-5 (IG+) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      L76-1 (GND) - Body ground Always Below 1 Ω
      L76-2 (FGND) - Body ground Always Below 1 Ω
      L77-6 (RGND) - Body ground Always Below 1 Ω

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR