Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: ECO Switch Circuit

DESCRIPTION

When the ECO switch assembly (electric parking brake switch assembly) is operated, the air conditioning amplifier assembly receives a signal and enables or disables ECO mode control of the air conditioning system.

Symptom

Factor

When ECO switch assembly (electric parking brake switch assembly) is operated, blower speed does not change

  • Air conditioning amplifier assembly malfunction
  • ECO switch assembly (electric parking brake switch assembly) malfunction
  • Harness or connector

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ECO Switch

ECO switch assembly (electric parking brake switch assembly)

OFF or ON

OFF: ECO switch assembly (electric parking brake switch assembly) not pushed

ON: ECO switch assembly (electric parking brake switch assembly) pushed and held

ECO switch assembly (electric parking brake switch assembly) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display

ECO Switch

OK:

ECO switch assembly (electric parking brake switch assembly) condition displayed on the Techstream changes with the actual switch operation.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

2.

INSPECT ECO SWITCH ASSEMBLY (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Remove the ECO switch assembly (electric parking brake switch assembly).

Click here

(b) Inspect the ECO switch assembly (electric parking brake switch assembly).

Click here

NG

REPLACE ECO SWITCH ASSEMBLY (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

OK

3.

CHECK HARNESS AND CONNECTOR (ECO SWITCH ASSEMBLY (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G24-11 (ECU) - G36-20 (ECOS)

Always

Below 1 Ω

G24-16 (GND1) - Body ground

Always

Below 1 Ω

G24-11 (ECU) or G36-20 (ECOS) - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Dtc Check / Clear

    Front Window Fogging

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