Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B3S9
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 - 08/2020]
Title: HYBRID / BATTERY CONTROL: HV BATTERY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL; 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during HV battery removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure

Necessary Procedure

Effect/Inoperative Function when Necessary Procedure not Performed

Link
*: When performing learning using the Techstream.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; PARK ASSIST / MONITORING: INTELLIGENT CLEARANCE SONAR SYSTEM (for HV Model): CALIBRATION

Auxiliary battery terminal is disconnected/reconnected

Perform steering sensor zero point calibration

Lane departure alert system (w/ Steering Control)

2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; PRE-COLLISION: PRE-COLLISION SYSTEM (for HV Model): INITIALIZATION

Pre-collision system

Intelligent clearance sonar system*

Lighting System (for HV Model with Cornering Light)

Memorize steering angle neutral point

Parking assist monitor system

2019 - 2022 MY Avalon HV [04/2018 -        ]; PARK ASSIST / MONITORING: PARKING ASSIST MONITOR SYSTEM(for HV Model): INITIALIZATION

Panoramic view monitor system

2019 - 2022 MY Avalon HV [04/2018 -        ]; PARK ASSIST / MONITORING: PANORAMIC VIEW MONITOR SYSTEM (for HV Model): INITIALIZATION

Replacement of HV battery

Battery status info update

HV battery status information cannot be updated

2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): UTILITY

Replacement of hybrid battery terminal block

High voltage fuse accumulated load history reset

DTCs are stored

CAUTION:

  • Orange wire harnesses and connectors indicate high-voltage circuits. To prevent electric shock, always follow the procedure described in the repair manual.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): PRECAUTION

  • To prevent electric shock, wear insulated gloves when working on wire harnesses and components of the high voltage system.

NOTICE:

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • When the cable is disconnected from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected.

    Click here 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

  • If the HV battery has been struck or dropped, replace it.
  • When connecting a connector to the HV battery, confirm that the connector is securely connected through the following:

    - Push the connector until a click sound is heard.

    - Visually check and confirm that the connector is securely connected by pulling on it.

  • Make sure to insulate the high-voltage connectors and terminals of the HV battery with insulating tape after removing it.

    If the HV battery stored without insulating the connectors and terminals, electric shock or fire may result.

  • When performing repairs around the HV battery, such as using a tap, do not allow metal shavings to enter the HV battery.
  • Do not touch any high voltage wire harnesses, connectors or parts with bare hands.
  • Hold the areas shown in the illustration and lift the HV battery.
  • Do not allow foreign matter, such as grease or oil, to adhere to the bolts or nuts of the HV battery.
  • Do not put your hands into the openings of the HV battery.

    *a

    Opening
  • When removing/installing/moving the HV battery, make sure not to tilt it more than 80°.
  • Do not climb on top of or stand on the HV battery.
  • Do not allow any foreign matter or water to enter the HV battery.
  • If any bolts, nuts or clips are dropped into the HV battery, make sure to remove them.

HINT:

When disposing of an HV battery, make sure to return it through an authorized collection agent who is capable of handling it safely. If the HV battery is returned via the manufacturer specified route, it will be returned properly and in a safe manner by an authorized collection agent.

PROCEDURE

1. REMOVE SERVICE PLUG GRIP

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: SERVICE PLUG GRIP: REMOVAL

2. DISCONNECT ENGINE ROOM MAIN WIRE

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: FRAME WIRE: REMOVAL+

3. REMOVE CONNECTOR COVER ASSEMBLY

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL+

4. CHECK TERMINAL VOLTAGE

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL+

5. INSTALL CONNECTOR COVER ASSEMBLY

CAUTION:

Be sure to wear insulated gloves.

(a) Using a T25 "TORX" socket wrench, install the connector cover assembly to the inverter with converter assembly with the bolt (A).

Torque:

4.5 N·m {46 kgf·cm, 40 in·lbf}

NOTICE:

Do not touch the waterproof seal of the connector cover assembly.

*a

Bolt (A)

*b

Bolt (B)

(b) Install the bolt (B).

Torque:

8.0 N·m {82 kgf·cm, 71 in·lbf}

6. CONNECT ENGINE ROOM MAIN WIRE

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: FRAME WIRE: INSTALLATION+

7. REMOVE BATTERY COOLING BLOWER ASSEMBLY

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; HYBRID / BATTERY CONTROL: BATTERY BLOWER: REMOVAL

8. REMOVE NO. 1 HV BATTERY COVER PANEL RH

CAUTION:

Be sure to wear insulated gloves.

(a) Using the service plug grip, remove the battery cover lock striker.

HINT:

Insert the projection of the service plug grip and turn the button of the battery cover lock striker counterclockwise to release the lock.

*1

Service Plug Grip

*2

Battery Cover Lock Striker

*a

Projection

*b

Turn

*c

Button

(b) Remove the 3 bolts, 3 nuts and No. 1 HV battery cover panel RH from the HV battery.

9. DISCONNECT HV FLOOR UNDER WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Disconnect the 2 HV battery junction block assembly connectors.

NOTICE:

Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.

*a

Shield Ground

(b) Disconnect the shield ground from the HV battery.

(c) Disconnect the floor wire connector.

10. DISCONNECT FLOOR WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Disengage the clamp.

(b) Disconnect the electric vehicle battery plug assembly connector.

(c) Disconnect the HV battery junction block assembly connector.

11. REMOVE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY

Click here 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR (for Rear Floor): REMOVAL+

12. DISCONNECT FLOOR WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Disengage the 2 clamps to disconnect the floor wire.

13. REMOVE NO. 1 HYBRID BATTERY EXHAUST DUCT

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the clip.

(b) Disengage the claw to remove the No. 1 hybrid battery exhaust duct from the HV battery.

14. DISCONNECT FLOOR WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Disengage the clamp.

(b) Disconnect the battery voltage sensor connector.

15. REMOVE HV BATTERY

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the 5 bolts and HV battery from the vehicle body.

NOTICE:

  • Do not allow foreign matter, such as grease or oil, to adhere to the bolts of the HV battery.
  • To prevent the wire harness from being caught, make sure to bundle the wire harness using insulating tape or equivalent.
  • Use cardboard or another similar material to protect the HV battery and vehicle body from damage.
  • Since the HV battery is very heavy, 2 people are needed to remove it. When removing the HV battery, be careful not to damage the parts around it.
  • When removing the HV battery from the vehicle, do not allow it to contact the vehicle.
  • When removing/installing/moving the HV battery, make sure not to tilt it more than 80°.
  • Insulate the disconnected terminals or connectors with insulating tape.
  • If the HV battery has been struck or dropped, replace it.

16. REMOVE NO. 4 HV BATTERY SHIELD SUB-ASSEMBLY

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the 4 nuts and No. 4 HV battery shield sub-assembly from the HV battery.

17. REMOVE NO. 3 HV BATTERY SHIELD SUB-ASSEMBLY

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the 4 nuts and No. 3 HV battery shield sub-assembly from the HV battery.

18. REMOVE NO. 4 HV BATTERY END PLATE SUB-ASSEMBLY

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the 2 bolts, 2 nuts and No. 4 HV battery end plate sub-assembly from the HV battery.

*a

Bolt

*b

Nut

19. REMOVE NO. 5 HV BATTERY END PLATE SUB-ASSEMBLY

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the 12 nuts and No. 5 HV battery end plate sub-assembly from the HV battery.

20. REMOVE UPPER HV BATTERY COVER SUB-ASSEMBLY

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: BATTERY VOLTAGE SENSOR (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

21. REMOVE NO. 1 HV BATTERY SHIELD PANEL

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: BATTERY VOLTAGE SENSOR (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

22. REMOVE BATTERY VOLTAGE SENSOR

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: BATTERY VOLTAGE SENSOR (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

23. REMOVE HYBRID BATTERY TERMINAL BLOCK

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: FUSE BOX (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

24. REMOVE HV BATTERY JUNCTION BLOCK ASSEMBLY

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HV RELAY ASSEMBLY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

25. REMOVE NO. 2 HYBRID BATTERY SHIELD SUB-ASSEMBLY

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HV BATTERY THERMISTOR (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

26. REMOVE NO. 1 HV BATTERY INTAKE DUCT LH

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HV BATTERY THERMISTOR (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+