AIR CONDITIONING SYSTEM IG Power Source Circuit

DESCRIPTION

The main power source is supplied to the A/C amplifier when the engine switch on (IG).

The power source is used for operating the A/C amplifier and servo motor, etc.

WIRING DIAGRAM

A01630KE07

INSPECTION PROCEDURE

Tech Tips

Start the engine before inspection. Check the IG1 relay or battery if the engine does not start.

PROCEDURE


  1. INSPECT FUSE (ECU-IG LH)


    1. A01621EE07

      Remove the ECU-IG LH fuse from the cowl side junction block LH.

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

      Standard Resistance
      Tester Item Condition Specified Condition
      ECU-IG LH fuse Always Below 1 Ω

    NG

    REPLACE FUSE (ECU-IG LH)

    OK

  2. INSPECT A/C AMPLIFIER (IG+ - GND)


    1. A0160AFE46

      Remove the A/C amplifier with its connectors still connected.

    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
      J58-21 (IG+) - J58-20 (GND) Engine switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) Click here

    OK

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

  3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)


    1. A0162IGE13

      Disconnect the A/C amplifier connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      J58-21 (IG+) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BODY GROUND)


    1. A0162IGE11

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J58-20 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE A/C AMPLIFIER Click here