AIR CONDITIONING SYSTEM Back-up Power Source Circuit

DESCRIPTION

The back-up power source circuit for the A/C amplifier is shown below. Power is supplied even when the engine switch is turned off. The power is used for diagnostic trouble code memory, etc.

WIRING DIAGRAM

A01CARCE02

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (ECU-B)


    1. Remove the ECU-B fuse from the No. 1 engine room relay block and junction block.

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

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

    NG

    REPLACE FUSE (ECU-B)

    OK

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


    1. A01CBUGE10

      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
      G33-21 (B) - Body ground Always 11 to 14 V
      G34-24 (+B2) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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