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

DTC Code DTC Name
Back-up Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

E293848E01

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CONFIRM MODEL

    1. Choose the model to be inspected.

    Result

    Result

    Proceed to

    w/o Stop and Start System

    A

    w/ Stop and Start System

    B
    B

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - ENGINE STOP AND START ECU)Click here

    A

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - POWER SOURCE)

    1. Disconnect the E54 air conditioning control assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E54-6 (B) - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E54-12 (GND) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - ENGINE STOP AND START ECU)

    1. Disconnect the E54 air conditioning control assembly connector.

    2. Disconnect the A25 engine stop and start ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E54-6 (B) - A25-2 (BO1)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - POWER SOURCE)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E54-12 (GND) - Body ground

      Always

      Below 1 Ω

    2. Reconnect the A25 engine stop and start ECU connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E54-6 (B) - E54-12 (GND)

      Always

      10 to 16 V

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick hereClick here

    NG

    GO TO STOP AND START SYSTEM

    Click here