2013 INFINITI M HYBRID service

1. About the INFINITI M35h HYBRID
This
hybrid electric vehicle (HEV) uses two types of batteries. One is a 12V battery that is the same as the
battery in vehicles powered by internal combustion engines. The 12V battery is located behind the rear seat
back with battery cable access through the trunk area. The other is the Lithium-ion (Li-ion) battery (high
voltage) for the traction motor which propels the vehicle. The Li-ion battery is located behind the rear seat
back with service plug access through the trunk area.
The high voltage Li-ion battery is recharged with an on-board DC/DC converter and generator powered by
the engine. Additionally, the vehicle system can recharge the Li-ion battery by converting driving force
into electricity while the vehicle is decelerating or being driven downhill. This is called regenerative charging.
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No. Component
LocationDescription
a Lithium-ion
(Li-ion)
Battery Trunk area (behind
rear seat back) The Li-ion battery stores and outputs DC
power (Maximum voltage 400V) needed to
propel the vehicle.
b DC/DC Converter Trunk area (mounted
to top of Li-ion bat-
tery) The DC/DC converter reduces the voltage of
the Li-ion battery to provide power to the 12V
battery in order to operate the vehicle’s electric
components (headlights, audio system, etc.) .
c Service Plug Trunk area (below
parcel shelf; behind
access door in trim
panel) This is used to disable the high voltage system.
d 12V Battery Trunk area (below
parcel shelf; behind
trim panel left of
Li-ion battery) A lead-acid battery that supplies power to the
low voltage devices.
e High Voltage Har-
nesses Trunk area (on Li-ion
battery) , under floor
pan, engine com-
partment Orange-colored power cables carry high DC
voltage between each of the high voltage com-
ponents.
f Electric Air Condi-
tioner Compressor Engine compart-
ment (front driver
side) Air conditioner compressor
g Traction Motor
Inverter Engine compart-
ment (rear passen-
ger side) Converts the DC power stored in the Li-ion
battery to three-phase AC power and controls
motor torque (revolution) by regulating the
motor current. The inverter has a built in high
voltage capacitor.
h Traction Motor Built-into the trans-
mission Converts three-phase alternating current (AC)
power to drive power (torque) which propels
the vehicle.
2-3 Li-ion Battery Pack Specifications Li-ion Battery Specifications
Li-ion

battery voltage 346V (400V max.)
Number of Li-ion battery modules in the pack 12
Li-ion battery module voltage 28.8V each
Li-ion battery dimensions 33.35 x 17.83 x 15.43 in. (847 x 453 x 392 mm)
Li-ion battery weight 121.28 lbs (55 kg)
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2-6 High Voltage Circuit Shut-Off System
This
vehicle is equipped with a system to shut off the current from the Li-ion battery by the following
methods: Service plug
Positioned in the center area of the Li-ion battery, this plug shuts off the out-
put
of high voltage when manually removed.
System main relays Controlled by the ignition switch, these relays are powered by the 12V sys- tem and shut off high voltage from the Li-ion battery.
Emergency shut-off sys-
tem In the case of a collision (air bag deployment, etc.) or certain system malfunc-
tions this system shuts off the high voltage from the Li-ion battery.
2-7 Preventing Electrical Shock 1. If it is necessary to touch any of the high voltage harnesses or components, always wearappropriate PPE (refer to 3-1 Preparation Items) . Shut off the high voltage system by referring to
3-3.1 High Voltage System Shut-Down Procedure.
2.

To avoid the risk of electrocution, do not touch the inside of the Li-ion battery with bare hands
after shutting off the high voltage system. The Li-ion battery maintains charge even though the
high voltage system is shut down.
3. Cover damaged high voltage components with insulated tape.
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• The vehicle contains parts that contain powerful magnets. If a person who is wearing
a
pacemaker or other medical device is close to these parts, the medical device may be
affected by the magnets. Such persons must not perform work on the vehicle.
• Be sure to check the READY indicator (1) in the instrument cluster, and verify that the READY indicator is off and the high voltage system is stopped.
• After the high voltage system is shut down, please wait for ten (10) minutes for complete discharge of the high voltage capacitor. While waiting, do not operate any vehicle
functions.
NOTE:
The high voltage full discharge takes ten (10) minutes, but after five (5) minutes the voltage
has dropped below 60V.
• Remove the 12V battery negative (-) terminal and wait for three (3) minutes to discharge the air bag capacitor. Even though the 12V battery negative (-) is disconnected, the
Supplemental Restraint System (SRS) air bag maintains voltage for three (3) minutes.
There is a possibility of sudden SRS air bag inflation due to harness short circuit or
damage and it may cause serious injuries.
• The 12V system will remain active even after the 12V battery negative (-) terminal is removed while the high voltage system is active. This is because the DC/DC converter will
not shut down and power will be supplied to the 12V system and high voltage system
continuously.
Before disconnecting the 12V battery terminal, if necessary, lower the windows, adjust the steering column,
adjust the seats, unlock the doors, open the trunk, etc. as required. Once the 12V battery is disconnected,
power controls will not operate.
Powering Down the High Voltage System
The high voltage system can be shut down with any 1 of the following procedures: • Turn OFF the power switch and disconnect the 12V battery. Refer to Primary Procedure.
•

Remove the fuse for the high voltage control system and disconnect the 12V battery. Refer to Alter-
nate

Procedure 1 .
•

Remove the service plug and disconnect the 12V battery. Refer to Alternate Procedure 2. 21

6. Open the 12V battery service access cover (G) .
7.
Disconnect negative (-) battery cable (H) and cover it with insulated tape.
8. Wait ten (10) minutes for complete discharge of the high voltage capacitor after the battery cable has been disconnected.
9. Perform the dismantling operation. Refer to 6. Dismantling Information. AAYIA0034ZZ
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5. Open the trunk. The trunk can be opened with the push-button switch (D) on the lower LH side of
the instrument panel or with the mechanical key (E) housed inside the INFINITI Intelligent Key™.
6. Open the 12V battery service access cover (F) .
7. Disconnect negative (-) battery cable (G) and cover it with insulated tape.
8. Wait ten (10) minutes for complete discharge of the high voltage capacitor after the fuse is pulled and battery cable has been disconnected.
9. Perform the dismantling operation. Refer to 6. Dismantling Information. AAYIA0011GB
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Alternate Procedure 2
• Do not remove the service plug without always wearing appropriate PPE to help
protect the dismantler from serious injury or death by electrical shock.
• Immediately cover the service plug socket with insulated tape. To avoid electric shock, DO NOT touch the terminals inside the socket. To avoid unintended reinstallation and risk of electrical shock and severe personal injury
or

death, the dismantler should carry the service plug on his/her person while work is
in progress.
NOTE: Before disconnecting the 12V battery terminal, if necessary, lower the windows, adjust the
steering column, adjust the seats, unlock the doors, etc. Once 12V battery is disconnected,
power controls will not operate.
1. Check the READY indicator (A) status in the instrument cluster. If it is on, the high voltage systemis active.
2. Place the shift selector in the Park (P) position.
3. Push the ignition switch (B) once to turn OFF the high voltage system. Then verify whether the READY indicator (A) is off.
If the READY indicator (A) does not turn off, continue to the next steps to open the trunk for 12V
battery negative cable access. AAYIA0062ZZ
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6. Open the 12V battery service access cover (G) .
7.
Disconnect negative (-) battery cable (H) and cover it with insulated tape.
8. Open service plug access cover (J) .
9. Remove the service plug (K) by pressing the locking tab (L) and rotating the handle (M) fully outward (N) . Using the handle, pull the service plug (P) completely out of its socket.
10. Cover the service plug socket with insulated tape. AAYIA0035ZZ
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