AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) Back-up Power Source Circuit

DESCRIPTION

The back-up power source circuit for the air conditioning amplifier assembly is shown below. Power is supplied even when turning the engine switch off and is used for diagnostic trouble code memory, etc.

WIRING DIAGRAM

A015BFUE03

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (A/C)


    1. Remove the A/C fuse from the cowl side junction block LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A/C fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)

    A0155VCE05

    1. w/ Rear Heater


      1. Disconnect the E36 amplifier connector.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        E36-6 (+B1) - Body ground Always 11 to 14 V
        E36-7 (+B2) - Body ground
    2. A0158GFE06

      w/o Rear Heater


      1. Disconnect the E81amplifier connector.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        E81-21 (+B1) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here