HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): Pattern Select Switch Eco Mode Circuit; 2019 - 2020 MY Avalon HV [04/2018

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001A0GC
Model Year Start: 2019	Model: Avalon HV	Prod Date Range: [04/2018 - 08/2020]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): Pattern Select Switch Eco Mode Circuit; 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]

Pattern Select Switch Eco Mode Circuit

DESCRIPTION

When selecting ECO drive mode, the ECO drive mode switch (electric parking brake switch assembly) operation signal is sent to the air conditioning amplifier assembly. Following this, ECO drive mode control is activated for the heater and air conditioning system and the hybrid vehicle control system.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (CAN BUS CHECK)

Click here

Result	Proceed to
All of the ECUs and sensors that are currently connected to the CAN communication system are displayed	A
None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed	B

GO TO CAN COMMUNICATION SYSTEM

2.	CHECK DTC OUTPUT (HEALTH CHECK)

Click here

Result	Proceed to
No DTCs are output	A
DTCs are output	B

GO TO DTC CHART

3.	READ VALUE USING TECHSTREAM (ECO SWITCH)

(a) Connect the Techstream to the DLC3.

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

Body Electrical > Air Conditioner > Data List

Tester Display
ECO Switch

(d) Read the value displayed on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

ECO Switch

ECO drive mode switch condition

ON or OFF

ECO drive mode switch being pushed and held: ON

ECO drive mode switch not operated: OFF

Result	Proceed to
The Techstream display changes according to the ECO drive mode switch operation	A
The Techstream display does not change according to the ECO drive mode switch operation	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

4.	INSPECT ECO DRIVE MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

Click here

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (ECO DRIVE MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) - BODY GROUND)

(a) Disconnect the G24 ECO drive mode switch (electric parking brake switch assembly) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G24-16 (GND1) - Body ground	Always	Below 1 Ω

*a	Front view of wire harness connector (to ECO Drive Mode Switch (Electric Parking Brake Switch Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

(b) Disconnect the G24 ECO drive mode switch (electric parking brake switch assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G36-20 (ECOS) - G24-11 (ECU)	Always	Below 1 Ω
G36-20 (ECOS) or G24-11 (ECU) - Body ground	Always	10 kΩ or higher

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

Front view of wire harness connector

(to ECO Drive Mode Switch (Electric Parking Brake Switch Assembly))

(d) Reconnect the G24 ECO drive mode switch (electric parking brake switch assembly) connector.

(e) Reconnect the G36 air conditioning amplifier assembly connector.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR