Infiniti QX56 (JA60). Manual - part 236

KEY SWITCH (BCM INPUT)

DLK-115

< COMPONENT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

DLK

N

O

P

KEY SWITCH (BCM INPUT)

Diagnosis Procedure

INFOID:0000000005146991

Regarding Wiring Diagram information, refer to 

DLK-178, "Wiring Diagram — INTELLIGENT KEY SYSTEM —

"

.

1.

CHECK KEY SWITCH POWER SUPPLY CIRCUIT

1. Remove mechanical key from ignition switch.

2. Disconnect key switch and ignition knob switch connector.

3. Check voltage between key switch and ignition knob switch har-

ness connector M12 terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Check harness between key switch and ignition knob

switch and fuse.

2.

CHECK KEY SWITCH

Check continuity between key switch and ignition knob switch termi-

nals 3 and 4.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Replace key cylinder assembly (built-in key switch).

3.

CHECK KEY SWITCH SIGNAL CIRCUIT

1. Disconnect BCM connector.

2. Check continuity between BCM harness connector M18 terminal

37 and key switch and ignition knob switch harness connector

M12 terminal 4.

3. Check continuity between BCM harness connector M18 terminal

37 and ground.

Is the inspection result normal?

YES

>> Key switch (BCM input) circuit is OK.

NO

>> Repair or replace harness between key switch and ignition knob switch and BCM.

3 – Ground

: Battery voltage.

PIIB4254E

Component

Terminals

Condition

Continuity

Ignition 

switch

3

4

Insert mechanical key 
into ignition switch.

Yes

Remove mechanical key 
from ignition switch.

No

PIIA6140E

37 – 4

: Continuity should exist.

37 – Ground

: Continuity should not exist.

PIIB4256E

DLK-116

< COMPONENT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

IGNITION KNOB SWITCH

IGNITION KNOB SWITCH

Diagnosis Procedure

INFOID:0000000005146992

Regarding Wiring Diagram information, refer to 

DLK-178, "Wiring Diagram — INTELLIGENT KEY SYSTEM —

"

.

1.

CHECK IGNITION KNOB SWITCH

With CONSULT-III

Display “PUSH SW” on DATA MONITOR screen, and check if ON/OFF display is linked to ignition switch oper-

ation.

Without CONSULT-III

1. Turn ignition switch OFF.

2. Disconnect Intelligent Key unit connector.

3. Check voltage between Intelligent Key unit harness connector

M70 terminal 27 and ground.

Is the inspection result normal?

YES

>> Ignition knob switch is OK.

NO

>> GO TO 2

2.

CHECK IGNITION KNOB SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect key switch and ignition knob switch connector.

3. Check voltage between key switch and ignition knob switch harness connector M12 terminal 1 and

ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace key switch and ignition knob switch

power supply circuit.

3.

CHECK IGNITION KNOB SWITCH OPERATION

Check continuity between key switch and ignition knob switch terminals 1 and 2.

Monitor item

Condition

PUSH SW

Ignition switch is pushed: ON

Ignition switch is released: OFF

Connector

Terminals

Condition

Voltage (V)

(Approx.)

(+)

(–)

M70

27

Ground

Ignition switch is 
pushed

Battery voltage

Ignition switch is re-
leased

0

WIIA1175E

1 - Ground

: Battery voltage

PIIB4257E

IGNITION KNOB SWITCH

DLK-117

< COMPONENT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

DLK

N

O

P

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Replace key switch and ignition knob switch.

4.

CHECK IGNITION KNOB SWITCH CIRCUIT

1. Check continuity between Intelligent Key unit harness connector (A) M70 terminal 27 and key switch and

ignition knob switch harness connector (B) M12 terminal 2.

2. Check continuity between Intelligent Key unit harness connector

M70 terminal 27 and ground.

Is the inspection result normal?

YES

>> Check the condition of harness and harness connector.

NO

>> Repair or replace harness between Intelligent Key unit

and key switch and ignition knob switch.

Component

Terminals

Condition

Continuity

Ignition 

knob switch

1

2

Ignition switch is pushed

Yes

Ignition switch is released

No

PIIA9929E

27 - 2

: Continuity should exist.

27 - Ground

: Continuity should not exist.

WIIA1176E

DLK-118

< COMPONENT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

HEADLAMP FUNCTION

HEADLAMP FUNCTION

Diagnosis Procedure

INFOID:0000000005146993

1.

CHECK HEADLAMP OPERATION

Do headlamps operate with headlamp switch?
YES or NO

YES

>> Headlamp circuit is OK.

NO

>> Check headlamp circuit. Refer to 

EXL-4, "Work Flow"

.