Infiniti Q45. Manual - part 218

AUTO TRUNK SYSTEM

BL-141

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Terminals and Reference Value for Auto Trunk Control Unit

NIS000WA

Preliminary Check

NIS000WB

●

Trunk opener switch can unlock the trunk in regular mode.

Ter-

minal

Wire 

color

Item

Signal 

Input/Out-

put

Condition

Voltage (V)

(Approx.)

3

G/OR

Detention switch

Input

Vehi-
cle key 
in 
inserte
d

A/T selector lever in P posi-
tion

0

A/T selector lever in other 
position 

Battery voltage

4

R/L

Trunk buzzer

Input

Buzzer OFF

Battery voltage

Buzzer ON

0

5

G/Y

Electronic key trunk 
opening signal

Input

Electronic key trunk button (ON) 

 5 

→

 0 

→

 5

6

Y/R

Trunk lid opener switch

Input

OFF

→

 ON (OPEN)

5 

→

 0

7

BR/W

Vehicle speed signal

Input

Speedometer operation [the vehicle 
speed is approx. 40 km/h (25 MPH)].

8 

W/R

Trunk lid close switch

Input

Trunk lid close switch ON 

0

Trunk lid close switch OFF

5

10 Y/B

Weather strip detection 
switch

Input

Trunk lid is between just before fully 
closed position and fully closed posi-
tion (OFF)

5

Other than above (ON)

0

11

L/Y

Lid full up position 
switch

Input

Trunk lid fully opened position (ON)

0

Other than above (OFF)

5

12

P 

Trunk lid lock switch

Input

Engage the latch of trunk lock (lock)

 5

Engage the latch of trunk lock 
(unlock)

0

13

L/OR

Clutch solenoid

Input

Trunk auto operation

0

Other than above

Battery voltage

14

L/R

Encoder power supply

Output

—

Battery voltage

15

Y

Encoder pulse signal

Input/Out-

put

Trunk motor operation

16 R/W

Encoder 

ground

—

—

0

17 

PU

Power source (Fuse)

Input

—

Battery voltage

18

B

Ground

—

—

 0

20 G/W

Trunk motor OPEN 
signal

Output

When trunk lid auto open operates 

Battery voltage

Other than above

0

21 L/W

Trunk motor CLOSE 
signal

Output

When trunk lid auto close operates

Battery voltage

Other than above

0

PIIA0536E

OCC3383D

BL-142

AUTO TRUNK SYSTEM

●

Trunk lid opener cancel switch is ON.

●

Trunk lid can be open/closed properly with manual operation.

Symptom Chart

NIS000WC

Auto Trunk Control Unit Power Supply and Ground Circuit Check

NIS000WD

1. 

CHECK POWER SUPPLY CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect auto trunk control unit connector.

3.

Check voltage between auto trunk control unit harness connector B111 terminal 17 and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Check the following.

●

20A fuse [No.15, located in fuse block (J/B) No.1]

●

Harness for open or short between auto trunk control
unit and fuse.

Symptom

Malfunctioning system and reference

Refer to page

Trunk lid auto OPEN/CLOSE operation does not work.

1. Check auto trunk control unit power supply 
and ground circuit

BL-142

2. Check vehicle speed signal

DI-18

3. Check A/T device (detention switch)

BL-143

4. Check trunk motor

BL-145

5. Check clutch solenoid 

BL-145

6. Check weather strip detection switch

BL-148

7. Check lid full up position switch

BL-149

8. Replace auto trunk control unit

BL-135

Trunk lid auto OPEN operation does not work with the trunk lid 
opener switch.

1. Check trunk lid opener switch

BL-150

2. Check trunk cancel switch

BL-90

3. Replace auto trunk control unit

BL-135

Trunk lid auto OPEN operation does not work with electronic key.
(Door locking/unlocking operation with electronic key is normal.)

1. Check trunk open signal

BL-152

2. Check trunk motor

BL-145

3. Replace auto trunk control unit

BL-135

Trunk lid stops during auto OPEN/CLOSE operation.

1. Check trunk motor

BL-145

2. Check clutch solenoid

BL-145

3. Replace auto trunk control unit

BL-135

Trunk lid auto CLOSE operation does not work with trunk lid close 
switch.

1. Check trunk lid close switch

BL-146

2. Replace auto trunk control unit

BL-135

Trunk lid stops immediately after auto CLOSE operation starts

1. Check encoder circuit

BL-153

2. Replace auto trunk control unit.

BL-135

17 (PU) – Ground

: Battery voltage

PIIA2937E

AUTO TRUNK SYSTEM

BL-143

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2. 

CHECK GROUND CIRCUIT 

Check continuity between auto trunk control unit harness connector B111 terminal 18 and ground.

OK or NG

OK

>> Auto trunk control unit power supply and ground circuit

is OK.

NG

>> Repair or replace harness.

A/T Device (Detention Switch) Check

NIS000WE

1. 

CHECK DETENT SWITCH SIGNAL

Insert key to ignition key switch cylinder, check voltage between auto trunk control unit connector and ground.

OK or NG

OK

>> A/T device (detention switch) is OK.

NG

>> GO TO 2.

2. 

CHECK HARNESS CONTINUITY

1.

Turn ignition switch OFF.

2.

Disconnect auto trunk control unit and A/T device (detention switch) connector.

3.

Check continuity between auto trunk control unit connector B110 terminal 3 and A/T device (detention
switch) connector M97 terminal 7.

4.

Check continuity between auto trunk control unit connector B110
terminal 3 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness.

18 (B) –  Ground

: Continuity should exist.

PIIB0186E

Connector

Terminals (Wire color)

Condition

Voltage (V)

(Approx.)

(+)

(-)

B110

3 (G/OR)

Ground

A/T selector lever 
in P position

0

Other than above

Battery voltage

PIIB0244E

3 (G/OR) – 7 (G/OR)

: Continuity should exist.

3 (G/OR) – Ground

: Continuity should not exist.

PIIB8412E

BL-144

AUTO TRUNK SYSTEM

3. 

CHECK DETENTION SWITCH

Check continuity between A/T device (detention switch) terminals 6 and 7.

OK or NG

OK

>> GO TO 4.

NG

>> Replace A/T device (detention switch).

4. 

CHECK HARNESS CONTINUITY 

1.

Disconnect key switch connector.

2.

Check continuity between A/T device (detention switch) connector M97 terminal 6 and key switch and key
lock solenoid connector M64 terminal 4.

3.

Check continuity between detention switch connector M97 ter-
minal 6 and ground.

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace harness.

5. 

CHECK KEY SWITCH

Check continuity between key switch terminals 3 and 4.

OK or NG

OK

>> Check the following.

●

10A fuse [No.32, located in fuse block (J/B) No.2]

●

Harness for open or short between key switch and
fuse.

NG

>> Repair or replace harness.

Terminals Condition

Continuity

6 7

A/T selector lever in P position

No

Other than above

Yes

PIIB0188E

6 (PU/W) – 4 (PU/W)

: Continuity should exist,

6 (PU/W) – Ground

: Continuity should not exist.

PIIB0189E

Terminals

Condition

Continuity

3

4

Key is inserted

Yes

Key is removed

No

PIIB0245E