2018 INFINITI Q50 HYBRID fuse

The following warning label is applied to the high-voltage battery located inside the luggage compartment.
2-5
High-voltage Safety System
The high-voltage safety system is intended to help keep vehicle occupants and emergency responders safe
from high-voltage electricity. • A high-voltage fuse provides short circuit protection inside the high-voltage battery.
• The high-voltage safety system is insulated from the metal chassis.
• Positive and negative high-voltage power cables are connected to the high-voltage battery and arecontrolled by normally open system main relays (SMR1 and SMR2) . When the vehicle is shut off,
the relays stop electrical flow from leaving the high-voltage battery. However, it can take
approximately ten (10) minutes for the high-voltage capacitor to fully discharge. AAYIA0456ZZ
FRG–14

• The high-voltage system and high-voltage capacitor may remain powered for up to
approximately 10 minutes after the vehicle is shut off. Personal Protective Equipment
(PPE) must always be worn when touching or working on high-voltage components
to avoid risk of electrical shock and severe personal injury or death.
• The high-voltage battery retains high-voltage at all times. PPE must always be worn when touching or working on high-voltage components to avoid risk of electrical shock and
severe personal injury or death.
• A ground fault monitor continuously monitors for high-voltage leakage to the metal chassis while the vehicle is running. If a malfunction is detected, the HPCM (hybrid powertrain control module) will
illuminate the hybrid system warning lamp in the instrument cluster.
•

The high-voltage battery relays (SMR1 and SMR2) will automatically open to stop the electrical flow
in front, side or certain rear collisions that are sufficient enough to activate the supplemental
restraint system (SRS) . Trunk
J

unction Box High-Voltage Battery
System main relay 1
Service Plug (With Fuse)
System main relay 2
Transmission
Traction Motor Traction Motor
Inverter
(With built in high- voltage capacitor) Electric
Compressor DC/DC
Converter
Engine Compartment DANGER
HPCM
(Hybr

id Powertrain
Control Module)
AAYIA0156GB
FRG–15

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 12-volt battery. Refer to Primary Procedure
(FRG–22) .
•

Disconnect the underhood fuse panel terminal connector for the high-voltage control system and
disconnect the 12-volt battery. Refer to Alternate Procedure 1 (Disconnect Underhood Fuse Panel)
(FRG–25) .
•

Remove the service plug and disconnect the 12-volt battery. Refer to Alternate Procedure 2
(Remove

Service Plug) (FRG–28) .
Primary

Procedure
NOTE:
Before disconnecting the 12-volt battery terminal, if necessary, lower the windows, adjust
the steering column, adjust the seats, unlock the doors, etc. Once 12-volt battery is
disconnected, power controls will not operate.
1. If possible, check the READY indicator status in the instrument cluster. If it is on, the high-
voltage

system is active.
2. Place the shift selector in the Park (P) position.
3. Push the ignition switch once to turn OFF the high- voltage system. Verify that the READY indicator is off
and then continue to the next steps to open the trunk
for 12-volt battery negative cable access.
If the READY indicator does not turn off, refer to
Alternate Procedure 1 (Disconnect Underhood Fuse
Panel)
(FRG–25)
4. If possible, keep the Infiniti Intelligent Key at least 5
meters (16 feet) away from the vehicle (except to open
the trunk as noted below) . AAYIA0191ZZ
LOCK
ACC
(OFF)
ON
AAYIA0192ZZ
AAYIA0068ZZ
FRG–22

Alternate Procedure 1 (Disconnect Underhood Fuse Panel)
NO
TE:
Before disconnecting the underhood fuse panel and the negative (-) battery cable, if
necessary, lower the windows, adjust the steering column, adjust the seats, unlock the
doors, etc. Once the underhood fuse panel and negative (-) battery cable are disconnected,
power controls will not operate.
1. Pull release handle (1) and pull up release lever (2) to open the hood.
2. Remove clips (A) and RH hood ledge cover (1) .NOTE: : Arrow in illustration depicts vehicle front
direction.
3.

Remove clips (A) and RH cowl cover (1) . TGAAYIA0009ZZ
AAYIA0207ZZ
AAYIA0208ZZ
FRG–25

4. Disengage pawls (A) of underhood fuse panel cover and
remove underhood fuse panel cover (1) .
NOTE: : Arrow in illustration depicts vehicle front
direction.
5.

Pull underhood fuse panel (1) out by hand and
disconnect terminal (black) connector (A) .
NOTE: : Arrow in illustration depicts vehicle front
direction.
6.

If you cannot identify the connector, disconnect all
connectors on the underhood fuse panel. To avoid unintended reinstallation and risk of electrical shock and severe personal injury or
death,

the rescuer should cover the fuse box and connectors with insulated tape or remove
the fuse panel and carry on his/her person.
7. Open the trunk using any of the following:NOTE:
The trunk release power cancel switch must be in the
ON position in order for the trunk to be opened
using any of the methods below.
a. push-button switch on the lower LH side of theinstrument panel (ensure that the trunk release
power cancel switch is in the ON position) . A
1
AAYIA0209ZZ 1
A
AAYIA0210ZZ
OFF
ON AAYIA0203ZZ
FRG–26

b. trunk button on the Infiniti Intelligent Key
[press for longer than one (1) second].
c. trunk open request switch (located above license plate)*.
* You must have the Infiniti Intelligent Key within
approximately 1 meter (3 feet) range of trunk
request switch to use the trunk open
request switch function.
NOTE:
If the electrical release does not work, the
trunk will have to be forced open.
8. Open the 12-volt battery service access cover.
9. Disconnect negative (-) battery cable and cover it with insulated tape.
10. Wait approximately ten (10) minutes for complete discharge of the high-voltage capacitor
after the fuse panel and battery cable have been disconnected.
11. Perform the first response action. AAYIA0068ZZ
AAYIA0194ZZ
AAYIA0195ZZ
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FRG–27