T-SB-0033-22

Rev2

April 1, 2022

Maintenance for HV and Auxiliary Batteries
Service
Category

General

Section

Pre-Delivery Service

Market USA

Applicability
YEAR(S)

MODEL(S)

2023

Camry HV, Corolla Cross
HV, Corolla HV, Highlander
HV, Mirai, Prius, RAV4 HV,
RAV4 Prime, Sequoia HV,
Sienna HV, Tundra HV,
Venza HV

ADDITIONAL INFORMATION

REVISION NOTICE
November 22, 2022 Rev2:
 Applicability has been updated to include 2023 model year Corolla Cross HV, Prius,
RAV4 Hybrid, and RAV4 Prime vehicles.
August 18, 2022 Rev1:
 Applicability has been updated to include 2023 model year Highlander Hybrid, Sequoia Hybrid,
and Tundra Hybrid vehicles.
Any previous printed versions of this bulletin should be discarded.

Draft - Confidential

© 2022 Toyota Motor Sales, USA

Page 1 of 6

T-SB-0033-22

Rev2

April 1, 2022

Page 2 of 6

Maintenance for HV and Auxiliary Batteries
Introduction

Hybrid vehicles are equipped with two types of batteries:


Hybrid vehicle (HV) battery.



Auxiliary (12V) battery.

If the hybrid vehicle is put into storage, the State-Of-Charge (SOC) of its HV battery and auxiliary
battery will gradually decrease. To prevent the auxiliary battery from becoming discharged during
storage, proper maintenance is necessary.
As a matter of policy, Toyota does not provide battery warranty coverage for discharged and/or
failed batteries due to lack of maintenance. It is the dealer’s responsibility to maintain the
specified SOC of the vehicle’s battery while in stock and ensure proper SOC at delivery.
Perform the following maintenance service for the HV battery and auxiliary battery.
NOTE
 BEFORE disconnecting the auxiliary battery, confirm the shift lever is in the “P” position. The shift lever
CANNOT be shifted from the “P” position with the auxiliary battery disconnected.
 Do NOT apply the parking brake. Ensure vehicles with electronic parking brakes do NOT engage
and the Auto function has been DISABLED (refer to the vehicle’s Owner’s Manual for details).
 If the negative (–) terminal of the auxiliary battery is reconnected, even if the Power button is in the
Start mode, the hybrid system may NOT start. In this case, push the Power button and select the Start
mode again to start the hybrid system (the Ready light is ON). If the hybrid system still does NOT start
(the Ready light is OFF), refer to the Repair Manual.

Maintenance Items
CONDITION*

MAINTENANCE OPERATION

Before Delivery

Fully charge the auxiliary battery (deliver the vehicle to the
customer AFTER it is fully charged to 12.6V or more).

To Store for 30 Days or More
(Except Mirai)

Disconnect the negative (–) terminal of the auxiliary battery
in the luggage compartment to prevent the SOC
of the auxiliary battery from decreasing during storage due
to parasitic current.

Periodical Battery Charging: Upon
arrival at the dealership and then
every 2 months

Keep the hybrid system ON for 30 minutes with the
transmission in the “P” position (in order to charge the HV
battery and the auxiliary battery).

*The condition also corresponds with the section titles within this bulletin.

© 2022 Toyota Motor Sales, USA

T-SB-0033-22

Rev2

April 1, 2022

Page 3 of 6

Maintenance for HV and Auxiliary Batteries
Warranty Information
OP CODE

DESCRIPTION

TIME

OFP

T1

T2

N/A

Not Applicable to Warranty

–

–

–

–

Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)

PART NUMBER

QTY

Battery Diagnostic Tool*

DCA-8000P T

1

*Essential SST.

NOTE
 The DCA-8000 battery diagnostic tool (P/N DCA-8000P T) supersedes the GR8 battery diagnostic
station (P/N 00002-MCGR8).
 Additional SSTs may be ordered by calling 1-800-933-8335.

Before Delivery

1. BEFORE charging the auxiliary battery, turn OFF ALL lights, accessories, and the
hybrid system.
2. Check the battery SOC.


If the battery voltage is LESS THAN 12.6V, continue to step 3.



If the battery voltage is 12.6V or MORE, replace the positive (+) terminal cover, install the
battery cover (if applicable), and close the luggage compartment/hood.
NOTE
 If measuring the voltage with the negative (–) terminal connected, turn OFF the Power
button and turn ON the high beams for 20 – 30 seconds. This will remove the surface
charge from the battery.
 If the engine has been running before measuring the voltage, wait 20 minutes or more after
the engine stops. This removes the surface charge.
 For details on how to use the battery diagnostic station, refer to the DCA-8000 Instruction Manual
located at TIS – Diagnostics – Tools & Equipment – Battery Diagnostics.

© 2022 Toyota Motor Sales, USA

T-SB-0033-22

Rev2

April 1, 2022

Page 4 of 6

Maintenance for HV and Auxiliary Batteries
Before Delivery (continued)

3. Test the auxiliary battery using the
DCA-8000 battery diagnostic tool’s
Advanced Battery Test mode.

Figure 1. DCA-8000 Battery Diagnostic Tool

If charging is required, the DCA-8000
battery diagnostic tool will automatically
start to charge.
A. Connect the red charger clamp to
the positive (+) terminal and the
black charger clamp to the
negative (–) terminal.
B. Plug the charger into a grounded 110V
outlet and press the power button.
C. Once the DCA-8000 battery diagnostic
tool is properly turned ON, perform an
Advanced Battery Test. The DCA-8000
battery diagnostic tool will indicate
results when complete. If the battery
tests bad, the DCA-8000 will display
“Replace Battery.” In this case, replace
the auxiliary battery.

CAUTION
 Charge in a well-ventilated area.
 Do NOT allow sparks OR fire near the auxiliary battery.

NOTE
If the auxiliary battery was stored at 32°F (0°C) or below, charge the auxiliary battery in a room
above 32°F (0°C).

4. If the DCA-8000 battery diagnostic tool is NOT available, you may charge the auxiliary battery
by cycling the vehicle to Ready ON.


Run time will vary depending on the battery SOC.



If this method is used, you MUST confirm that the battery is charged to 12.8V using
a DVOM.

© 2022 Toyota Motor Sales, USA

T-SB-0033-22

Rev2

April 1, 2022

Page 5 of 6

Maintenance for HV and Auxiliary Batteries
To Store for 30 Days or More-Disconnect the Negative (–) Terminal (Except Mirai)

1. Turn OFF ALL lights, accessories, and the hybrid system.
2. Disconnect the negative (–) terminal.

Figure 2.

NOTE
When it is necessary to move the vehicle,
reconnect the negative (–) terminal.

1
c

3. When removing the vehicle from storage,
connect the negative (–) terminal.
Please refer to applicable Repair Manual
for torque specifications.
NOTE
AFTER recharging the auxiliary battery, the
hybrid system may NOT start. Follow the
procedure below to initialize the system.

1

Negative (–) Terminal

1. Put the shift lever in the “P” position.
2. Open and close ANY of the doors.
3. Restart the hybrid system.

Periodical Battery Charging-Cycle Vehicle to Ready ON
NOTE
 When the remaining capacity of the HV battery is low, the gasoline engine automatically starts and the
HV battery is charged. The auxiliary battery is also charged by the HV battery regardless of the
gasoline engine operation.
 Be sure to reconnect the negative (–) terminal of the auxiliary battery BEFORE performing
this procedure.

1. Park the vehicle in open air or connect the exhaust extraction hose to the exhaust pipe.
2. Apply the parking brake.

© 2022 Toyota Motor Sales, USA

T-SB-0033-22

Rev2

April 1, 2022

Page 6 of 6

Maintenance for HV and Auxiliary Batteries
Periodical Battery Charging-Cycle Vehicle to Ready ON (continued)

3. With the brake pedal depressed, push the
Power button and check that the Ready light
in the meter illuminates when the hybrid
system starts (the Ready light is ON).

Figure 3.

4. Turn OFF ALL lights and accessories.

5. Check that the shift lever is in the “P” position.

6. Keep the Ready light ON and charge the HV battery for 30 minutes.
NOTE
 If the amount of charging energy is small, the display may NOT indicate the energy flow.
 Ensure there is a sufficient amount of fuel for the vehicle to run for 30 minutes.

© 2022 Toyota Motor Sales, USA