T-SB-0006-19

January 7, 2019

Maintenance for HV and Auxiliary Batteries
Service
Category

General

Section

Pre-Delivery Service

Market USA

Applicability
YEAR(S)

MODEL(S)

2020

Avalon HV, Camry HV,
Corolla HV, Highlander HV,
Mirai, Prius, Prius C, Prius
Prime, RAV4 HV

ADDITIONAL INFORMATION

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.
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 and apply the
parking brake completely. The shift lever CANNOT be shifted from the “P” position with the auxiliary
battery disconnected.
 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.

© 2018 Toyota Motor Sales, USA

Page 1 of 5

T-SB-0006-19

January 7, 2019

Page 2 of 5

Maintenance for HV and Auxiliary Batteries
Maintenance Items
CONDITION*

MAINTENANCE OPERATION

Before Delivery

To Store for 30 Days or More

Just After Unloading and
Every 2 Months

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

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

GR8 Battery Diagnostic Station*

00002-MCGR8

1

*Essential SST.

NOTE
 The GR8 battery diagnostic station (P/N 00002-MCGR8) supersedes the automatic trickle charger (P/N
00002-YA122-01) and fast battery chargers (Associated P/N ASE6003 and Christie P/N CAPPDQ). P/N
00002-YA122-01, ASE6003, and CAPPDQ are now obsolete.
 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.

© 2018 Toyota Motor Sales, USA

T-SB-0006-19

January 7, 2019

Page 3 of 5

Maintenance for HV and Auxiliary Batteries
Before Delivery (continued)

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, and close the back door.
NOTE
 If measuring the voltage with the negative (–) terminal connected, turn OFF the Power
button and turn ON the headlights 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.

3. Test the auxiliary battery using the GR8
battery diagnostic station.
 If the battery tests good, continue
to step 4.
 If the battery tests bad (“Replace
Battery”), replace the auxiliary battery.

Figure 1. GR8 Battery Diagnostic Station

4. Charge the auxiliary battery using the GR8 battery diagnostic station.
A. Connect the red charger clamp to the positive (+) battery terminal and the
black charger clamp to the negative (–) battery terminal.
B. Plug the charger into a grounded 110V nominal outlet and flip the Power switch to the
“ON” position.
C. Once the charger is properly turned ON, perform a diagnostic charge.
D. The GR8 battery diagnostic station will indicate results when complete.
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).

© 2018 Toyota Motor Sales, USA

T-SB-0006-19

January 7, 2019

Page 4 of 5

Maintenance for HV and Auxiliary Batteries
Before Delivery (continued)

5. If the GR8 battery diagnostic station is NOT available, you may charge the auxiliary battery by
cycling the vehicle to Ready ON.


Run time will vary depending on the SOC.



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

To Store for 30 Days or More

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

3. When removing the vehicle from storage,
connect the negative (–) terminal.
Torque: 6.5 N*m (66 kgf*cm, 58 in*lbf)
NOTE
AFTER recharging the auxiliary battery, the
hybrid system may NOT start. Follow the
procedure below to initialize the system.
1.
2.
3.

1

Negative (–) Terminal

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

Every Two Months
NOTE
 When the remaining capacity of the HV battery is low, the gasoline engine automatically starts and the
HV battery is charged by the generator. 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
When
the
thevehicle
remaining
in open
capacity
air or
of the
connect
HV battery
the exhaust
is low, the
extraction
gasoline engine
hose toautomatically
the exhauststarts
pipe.and the
HV battery is charged. The 12V auxiliary battery is also charged by the HV battery regardless of the
gasoline engine operation.

2. Apply the parking brake.

 Make sure to reconnect the negative (–) terminal of the auxiliary battery BEFORE performing
this procedure.
© 2018 Toyota Motor Sales, USA

T-SB-0006-19

January 7, 2019

Page 5 of 5

Maintenance for HV and Auxiliary Batteries
Every Two Months (continued)

3. With the brake pedal depressed, push the
Power button and select the Start mode 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.

© 2018 Toyota Motor Sales, USA