February 8, 2013

T-SB-0027-13

Maintenance for HV & Auxiliary Batteries
Service
Category

General

Section

Pre-Delivery Service

USA

Market

Applicability
YEAR(S)

MODEL(S)

2014

Prius, Prius C, Prius
PHV, Prius V

ADDITIONAL INFORMATION

Introduction

Prius vehicles are equipped with 2 types of batteries:
• Hybrid Vehicle (HV) battery
• 12-volt auxiliary battery
If Prius 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 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.

Warranty Information
OP CODE

DESCRIPTION

TIME

OFP

T1

T2

N/A

Not Applicable to Warranty

–

–

–

–

© 2013 Toyota Motor Sales, USA

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February 8, 2013

T-SB-0027-13

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Maintenance for HV & Auxiliary Batteries

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 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 TSB.

Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)

PART NUMBER

QTY

GR8 Battery Diagnostic Station**

00002-MCGR8

1

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.
** Essential SST.

© 2013 Toyota Motor Sales, USA

February 8, 2013

T-SB-0027-13

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 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 engine has been running before measuring the voltage, wait 20 minutes or more after
the engine stops. This removes the surface charge.

© 2013 Toyota Motor Sales, USA

February 8, 2013

T-SB-0027-13

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

1

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.
• If this method is used, you must confirm
that the battery is charged to 12.8 volts
using a DVOM.

© 2013 Toyota Motor Sales, USA

P/N 00002-MCGR8

February 8, 2013

T-SB-0027-13

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Maintenance for HV & Auxiliary Batteries

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

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 system.
2. Open back door and remove the battery cover
3. Disconnect the negative (–) terminal.

Figure 4..

1

1

© 2013 Toyota Motor Sales, USA

Negative Terminal

February 8, 2013

T-SB-0027-13

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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)

1

1

Negative Terminal

3. Install the battery cover and close the back door.
NOTE
After recharging the auxiliary battery, the hybrid 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 system.

© 2013 Toyota Motor Sales, USA

February 8, 2013

T-SB-0027-13

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, the gasoline engine automatically starts
and the HV battery is charged by the generator. The 12-volt 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.
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 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.

© 2013 Toyota Motor Sales, USA