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

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001B3SS
Model Year Start: 2019	Model: Avalon HV	Prod Date Range: [04/2018 - 08/2020]
Title: HYBRID / BATTERY CONTROL: HV RELAY ASSEMBLY (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 junction block assembly 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
*: When performing learning using the Techstream. Click here
Auxiliary battery terminal is disconnected/reconnected	Perform steering sensor zero point calibration	Lane departure alert system (w/ Steering Control)
		Pre-collision system
		Intelligent clearance sonar system*
		Lighting System (for HV Model with Cornering Light)
	Memorize steering angle neutral point	Parking assist monitor system
	Memorize steering angle neutral point	Panoramic view monitor system

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
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

PROCEDURE

1. REMOVE SERVICE PLUG GRIP

Click here

2. DISCONNECT ENGINE ROOM MAIN WIRE

Click here

3. REMOVE CONNECTOR COVER ASSEMBLY

Click here

4. CHECK TERMINAL VOLTAGE

Click here

5. INSTALL CONNECTOR COVER ASSEMBLY

Click here

6. CONNECT ENGINE ROOM MAIN WIRE

Click here

7. REMOVE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY

Click here

8. REMOVE REAR DOOR SCUFF PLATE LH

Click here

9. REMOVE REAR UNDER SIDE COVER LH

Click here

10. REMOVE REAR DOOR SCUFF PLATE RH

HINT:

Use the same procedure as for the LH side.

11. REMOVE REAR UNDER SIDE COVER RH

Click here

12. REMOVE REAR UNDER COVER

Click here

13. REMOVE REAR SEAT CUSHION LEG SUB-ASSEMBLY

Click here

14. REMOVE NO. 1 HV BATTERY COVER PANEL RH

Click here

15. DISCONNECT HV FLOOR UNDER WIRE

Click here

16. DISCONNECT FLOOR WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Disengage the clamp.

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

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

17. REMOVE NO. 1 HYBRID BATTERY EXHAUST DUCT

Click here

18. REMOVE UPPER HV BATTERY COVER SUB-ASSEMBLY

Click here

19. REMOVE HV BATTERY JUNCTION BLOCK ASSEMBLY

CAUTION:

Be sure to wear insulated gloves and protective goggles.

(a) Remove the bolt and disconnect the electric vehicle battery plug assembly.

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

NOTICE:

Insulate the disconnected connectors with insulating tape.

(d) Disengage the 2 claws and open the wiring harness protector.

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

NOTICE:

Insulate the disconnected connectors with insulating tape.

(f) Using a screwdriver with its tip wrapped with protective tape, disengage the 2 claws and remove the wiring harness protector.

*a	Protective Tape

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

(h) Remove the 4 nuts and HV battery junction block assembly from the HV battery.

NOTICE:

If the HV battery junction block assembly has been struck or dropped, replace it with a new one.