AIR CONDITIONING SYSTEM IG Power Source Circuit

DESCRIPTION

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

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

WIRING DIAGRAM

A019L7VE34

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Start the engine before inspection. Check the IG1 NO. 1 relay or battery if the engine does not start.

PROCEDURE


  1. INSPECT A/C AMPLIFIER


    1. A019MYPE44
      Text in Illustration
      *1

      Component with harness connected

      (A/C Amplifier)

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F50-1 (IG+) - F50-14 (GND) Engine switch off Below 1 V
      F50-1 (IG+) - F50-14 (GND) Engine switch on (IG) 11 to 14 V

    NG

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

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

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


    1. A019L63E46
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)

      Disconnect the A/C amplifier connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F50-1 (IG+) - Body ground Engine switch off Below 1 V
      F50-1 (IG+) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A019L63E47
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F50-14 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE A/C AMPLIFIER Click here