T-SB-0087-14

Rev1

August 11, 2014

Maintenance for HV & Auxiliary Batteries
Service
Category

General

Section

Pre-Delivery Service

Market

USA

Applicability
YEAR(S)

MODEL(S)

2016

Mirai, Prius, Prius C,
Prius V

2015

Prius, Prius C, Prius
PHV, Prius V

ADDITIONAL INFORMATION

REVISION NOTICE
September 1, 2015 Rev1:
• Applicability has been updated to include 2016 model year Mirai, Prius, Prius C, and Prius V
vehicles.
Any previous printed versions of this bulletin should be discarded.

Introduction

Prius and Mirai vehicles are equipped with 2 types of batteries:
• Hybrid Vehicle (HV) battery
• 12-volt auxiliary battery
If Prius or Mirai vehicles are 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.
Please perform the following maintenance service for the HV battery and 12-volt 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 12-volt 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/fuel cell system may NOT start. In this case, push the
“POWER” button and select the “START” mode again to start the hybrid/fuel cell system (the
“READY” light is ON). If the hybrid/fuel cell system still does NOT start (the “READY” light is
OFF), refer to the Repair Manual.

© 2015 Toyota Motor Sales, USA

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Rev1

T-SB-0087-14

August 11, 2014

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Maintenance for HV & Auxiliary Batteries

Warranty Information
OP CODE

DESCRIPTION

TIME

OFP

T1

T2

N/A

Not Applicable to Warranty

–

–

–

–

Maintenance Items
CONDITION*

MAINTENANCE OPERATION

Before Delivery

Fully charge 12-volt auxiliary battery (deliver the vehicle to
the customer after it is fully charged 12.6 V or more).

To Store for 30 Days or More

Disconnect the negative (–) terminal of the 12-volt
auxiliary battery in the luggage compartment to prevent
the SOC of the auxiliary battery from decreasing during
storage due to parasitic current.

Just After Unloading & Every 2 Months

Keep the Hybrid/Fuel Cell 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 SB.

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.

© 2015 Toyota Motor Sales, USA

T-SB-0087-14

Rev1

August 11, 2014

Page 3 of 7

Maintenance for HV & Auxiliary Batteries

Before Delivery
Fully charge the 12-volt auxiliary battery:

1. Before charging the auxiliary battery, turn OFF all lights, accessories, and the hybrid/fuel cell
system.
2. Open the back door and remove the battery cover.
3. Remove the positive (+) terminal cover.

Figure 1..

1

1

Positive Terminal Cover

4. Check the battery SOC.
• If the battery voltage is LESS THAN 12.6 V, then continue to step 5.
• If the battery voltage is 12.6 V or MORE, replace the positive (+) terminal cover, install
battery cover and close the back door.
NOTE
• If measuring the voltage with the negative (–) terminal connected, turn OFF the power
switch and turn ON the headlights for 20 to 30 seconds. This will remove the surface
charge from the battery.
• If the hybrid/fuel cell system has been running before measuring the voltage, wait 20
minutes or more after turning off the hybrid/fuel cell system. This removes the surface
charge.

© 2015 Toyota Motor Sales, USA

T-SB-0087-14

Rev1

August 11, 2014

Maintenance for HV & Auxiliary Batteries

Before Delivery (Continued)
Fully charge the 12-volt auxiliary battery: (Continued)

5. Test/charge the 12-volt auxiliary battery using the
GR8 Battery Diagnostic Station.

Figure 2.

.

NOTE
Be sure to use the latest GR8 Battery
Diagnostic Station software, which can be
found on TIS.

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 110-volt
nominal outlet and flip the power switch to the
“ON” position.
1

C. Once the charger is properly turned ON,
perform a diagnostic charge.
The GR8 Battery Diagnostic Station will
indicate result when complete.
If the battery tests bad ("Replace Battery"),
then replace 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).
CAUTION
• Charge in a well-ventilated area.
• Do NOT allow sparks or fire near the
auxiliary battery.

If the GR8 Battery Diagnostic Station is NOT
available, you may charge the 12-volt battery
by cycling the vehicle on to “READY.”
• Run time will vary depending on the state
of charge.

© 2015 Toyota Motor Sales, USA

GR8 Battery Diagnostic Station

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Maintenance for HV & Auxiliary Batteries

Before Delivery (Continued)
Fully charge the 12-volt auxiliary battery: (Continued)

• If this method is used, you must confirm
that the battery is charged to 12.8 volts
using a DVOM.
6. After charging the auxiliary battery, install the
positive (+) terminal cover.

Figure 3..

1

1

Positive Terminal Cover

7. Install the battery cover and close the back door.
To Store for 30 Days or More
Disconnect the negative (–) terminal:

1. Turn OFF all lights, accessories, and the hybrid/fuel cell system.
2. Open back door and remove the battery cover
3. Disconnect the negative (–) terminal.

Figure 4..

NOTE
After the ignition is turned off, the audio
receiver records various types of memory and
settings. Please wait at least 90 seconds before
disconnecting the cable from the negative
(-) auxiliary battery terminal after turning the
ignition off.
1

1

© 2015 Toyota Motor Sales, USA

Negative Terminal

T-SB-0087-14

Rev1

August 11, 2014

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Maintenance for HV & Auxiliary Batteries

To Store for 30 Days or More (Continued)
Disconnect the negative (–) terminal: (Continued)

4. Install the battery cover and close the back door.
NOTE
When it is necessary to move the vehicle, reconnect the negative (–) terminal.
When removing the vehicle from storage, connect the negative (–) terminal:

1. Open the back door and remove the battery cover.
2. Connect the negative (–) terminal.

Figure 5.

.

Torque: 6.0 N*m (61 kgf*cm, 4.4 ft*lbf)
NOTE
Certain systems need to be initialized after
disconnecting and reconnecting the cable to
the negative (-) auxiliary battery terminal.
Before starting the hybrid/fuel cell system,
ensure that the ground point is installed
securely to the body.

1

1

Negative Terminal

3. Install the battery cover and close the back door.
NOTE
After recharging the auxiliary battery, the hybrid/fuel cell system may NOT start. Follow the
procedure below to initialize the system.
• Put the shift lever in the “P” position.
• Open and close any of the doors.
• Restart the hybrid/fuel cell system.

© 2015 Toyota Motor Sales, USA

T-SB-0087-14

Rev1

August 11, 2014

Page 7 of 7

Maintenance for HV & Auxiliary Batteries

Every Two Months
Cycle vehicle to “READY” ON:
NOTE
• When the remaining capacity of the HV battery is low, if the vehicle is equipped with a gasoline
engine, it automatically starts and the HV battery is charged by the generator. On hydrogen
fuel cell vehicles, the HV battery is charged by the fuel cell system. The 12-volt auxiliary
battery is also charged by the HV battery regardless of the gasoline engine / hydrogen fuel
cell stack operation
• Be sure to reconnect the negative (–) terminal of the auxiliary battery BEFORE performing
this procedure.

1. If equipped with a gasoline engine, park the vehicle in open air or connect the exhaust extraction
hose to the exhaust pipe.
2. Apply the parking brake.
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/fuel cell system starts
(the “READY” light is ON).

Figure 6..

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.

© 2015 Toyota Motor Sales, USA