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

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001A0G4
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 EV Mode Circuit; 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]

Pattern Select Switch EV Mode Circuit

DESCRIPTION

The EV drive mode signal will be sent to the hybrid vehicle control ECU when the EV drive mode switch (electric parking brake switch assembly) is operated. If the specified conditions are met, the system enters EV drive mode and the vehicle will be driven using EV drive mode. This signal is then transmitted from the hybrid vehicle control ECU via CAN to the combination meter assembly to illuminate the EV drive mode indicator.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Depending on the condition of the hybrid control system and the driving conditions, the drive mode may not be able to be changed to EV drive mode and a warning message will be displayed on the multi-information display.

HINT:

Under the following conditions, the drive mode will not be able to be changed to EV drive mode:

The hybrid control system is extremely hot.
The hybrid control system is extremely cold.
The engine is warming up.
The SOC (State of Charge) of the HV battery is low.
The vehicle is being driven at a speed higher than the specified value.
The accelerator pedal is being fully depressed or the vehicle is climbing a slope.
The defroster is on.
DTCs are stored.

PROCEDURE

1.	ASK ABOUT VEHICLE CONDITION

(a) Check if a buzzer sounded and a message was displayed on the multi-information display when attempting to enter EV drive mode.

Result	Proceed to
No buzzer sounded and no message was displayed on multi-information display	A
A buzzer sounded and a message was displayed on multi-information display	B

HINT:

If a buzzer sounds and a message is displayed on the multi-information display, one or more of the EV drive mode entry conditions have not been met.

END

2.	READ VALUE USING TECHSTREAM (CAN BUS CHECK)

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: System Select / CAN Bus Check.

CAN Bus Check

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

(e) Turn the power switch off.

GO TO CAN COMMUNICATION SYSTEM

3.	CHECK DTC OUTPUT (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: System Select / Health Check.

(e) Check for DTCs.

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

(f) Turn the power switch off.

GO TO DTC CHART

4.	READ VALUE USING TECHSTREAM (EV MODE, EV MODE SWITCH)

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / EV Mode, EV Mode Switch.

Powertrain > Hybrid Control > Data List

Tester Display
EV Mode
EV Mode Switch

(e) Read the values displayed on the Techstream.

Powertrain > Hybrid Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

EV Mode

EV drive mode transition availability

ON or OFF

In EV drive mode: ON

EV Mode Switch

EV drive mode switch condition

ON or OFF

EV drive mode switch being pushed and held: ON

EV drive mode switch not operated: OFF

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

(f) Turn the power switch off.

GO TO PROBLEM SYMPTOMS TABLES

5.	INSPECT EV DRIVE MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

Click here

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

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

(a) Disconnect the G24 EV 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 EV Drive Mode Switch (Electric Parking Brake Switch Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - EV DRIVE MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY))

(a) Disconnect the G47 hybrid vehicle control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G47-15 (EVSW) - G24-14 (S)	Always	Below 1 Ω
G47-15 (EVSW) or G24-14 (S) - Body ground	Always	10 kΩ or higher

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

Front view of wire harness connector

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

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

(e) Reconnect the G47 hybrid vehicle control ECU connector.

REPLACE HYBRID VEHICLE CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR