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

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

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.

B

END

A

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Turn the power switch off.

B

GO TO CAN COMMUNICATION SYSTEM

A

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Check for DTCs.

(f) Turn the power switch off.

B

GO TO DTC CHART

A

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Read the values displayed on the Techstream.

(f) Turn the power switch off.

A

GO TO PROBLEM SYMPTOMS TABLES

B

Click here

NG

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

OK

(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))

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

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

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

*a Rear view of wire harness connector (to Hybrid Vehicle Control ECU) *b 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.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR