Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001RDNA
Model Year Start: 2021 Model: Avalon Prod Date Range: [08/2020 -           ]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model): Drive Mode Select Switch Circuit; 2021 - 2022 MY Avalon [08/2020 -        ]

Drive Mode Select Switch Circuit

DESCRIPTION

The characteristics of the electronic throttle and EPS operation change according to operation of the drive mode select switch (electric parking brake switch assembly).

WIRING DIAGRAM

PROCEDURE

1.

CHECK THE PROBLEM SYMPTOMS

(a) Check each symptom by checking the suspected areas in the table below.

Result

Proceed to

SPORT mode or NORMAL mode is abnormal.

A

ECO mode is abnormal.

B
B

GO TO AIR CONDITIONING SYSTEM

A

2.

CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs.

Click here 2019 - 2022 MY Avalon [04/2018 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

Result

Proceed to

CAN communication system DTCs are not output.

A

CAN communication system DTCs are output.

B
B

GO TO CAN COMMUNICATION SYSTEM

A

3.

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

(a) Turn the engine switch off.

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

*a

Front view of wire harness connector

(to Drive mode select switch (Electric parking brake switch assembly))

(c) 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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT DRIVE MODE SELECT SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Inspect drive mode select switch (electric parking brake switch assembly).

for UA80E: Click here 2019 - 2022 MY Avalon [04/2018 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): COMBINATION SWITCH: INSPECTION

for UB80F: Click here 2021 - 2022 MY Avalon [08/2020 -        ]; UB80F (AUTOMATIC TRANSMISSION / TRANSAXLE): COMBINATION SWITCH: INSPECTION

OK:

Drive mode select switch (Electric parking brake switch assembly) is normal.

Result

Proceed to

CAN communication system DTCs are not output. (for 2GR-FKS)

A

CAN communication system DTCs are not output. (for A25A-FKS)

B

CAN communication system DTCs are output.

C
B

GO TO STEP 6

C

REPLACE DRIVE MODE SELECT SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

for UA80E: Click here 2019 - 2022 MY Avalon [04/2018 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): COMBINATION SWITCH: REMOVAL

for UB80F: Click here 2021 - 2022 MY Avalon [08/2020 -        ]; UB80F (AUTOMATIC TRANSMISSION / TRANSAXLE): COMBINATION SWITCH: REMOVAL

A

5.

CHECK HARNESS AND CONNECTOR (DRIVE MODE SELECT SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) - ECM)

(a) Connect the G24 drive mode select switch (electric parking brake switch assembly) connector.

(b) Disconnect the A18 ECM connectors.

*a

Front view of wire harness connector

(to ECM)

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

Standard Resistance:

w/ Adaptive Variable Suspension System

Tester Connection

Condition

Specified Condition

A18-55 (PWMS) - Body ground

SPORT S/S+ mode switch being turned and held

Below 1 Ω

A18-55 (PWMS) - Body ground

SPORT S/S+ mode switch not turned

10 kΩ or higher

A18-40 (SPCN) - Body ground

NORMAL/CUSTOM mode switch being pushed and held

Below 1 Ω

A18-40 (SPCN) - Body ground

NORMAL/CUSTOM mode switch not pushed

10 kΩ or higher

w/o Adaptive Variable Suspension System

Tester Connection

Condition

Specified Condition

A18-55 (PWMS) - Body ground

SPORT mode switch being turned and held

Below 1 Ω

A18-55 (PWMS) - Body ground

SPORT mode switch not turned

10 kΩ or higher

A18-40 (SPCN) - Body ground

NORMAL mode switch being pushed and held

Below 1 Ω

A18-40 (SPCN) - Body ground

NORMAL mode switch not pushed

10 kΩ or higher
OK

REPLACE ECM 2019 - 2021 MY Avalon [04/2018 - 08/2021]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL 2022 MY Avalon [08/2021 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (DRIVE MODE SELECT SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) - ECM)

(a) Connect the G24 drive mode select switch (electric parking brake switch assembly) connector.

(b) Disconnect the A64 ECM connectors.

*a

Front view of wire harness connector

(to ECM)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A64-12 (PWMS) - Body ground

SPORT mode switch being turned and held

Below 1 Ω

A64-12 (PWMS) - Body ground

SPORT mode switch not turned

10 kΩ or higher

A64-13 (SPCN) - Body ground

NORMAL mode switch being pushed and held

Below 1 Ω

A64-13 (SPCN) - Body ground

NORMAL mode switch not pushed

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR