Nissan Frontier D40. Manual - part 968

SEC-28

< COMPONENT DIAGNOSIS >

KEY CYLINDER SWITCH

KEY CYLINDER SWITCH

DRIVER SIDE

DRIVER SIDE : Description

INFOID:0000000005272612

The main power window and door lock/unlock switch detects condition of the door key cylinder switch and
transmits to BCM as the LOCK or UNLOCK signal. 

DRIVER SIDE : Component Function Check

INFOID:0000000005272613

1.

CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL

Check "KEY CYL LK-SW" AND "KEY CYL UN-SW" in DATA MONITOR mode for “POWER DOOR LOCK
SYSTEM” with CONSULT-III.

Is the inspection result normal?

YES

>> Key cylinder switch is OK.

NO

>> Refer to 

SEC-28, "DRIVER SIDE : Diagnosis Procedure"

.

DRIVER SIDE : Diagnosis Procedure

INFOID:0000000005272614

Regarding Wiring Diagram information, refer to 

SEC-43, "Wiring Diagram - VEHICLE SECURITY SYSTEM

(King Cab) -"

 or 

SEC-52, "Wiring Diagram - VEHICLE SECURITY SYSTEM (Crew Cab) -"

.

1.

CHECK DOOR KEY CYLINDER SWITCH LH

With CONSULT-III

Check front door lock assembly LH (key cylinder switch) ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in
DATA MONITOR mode in CONSULT–III. Refer to 

DLK-20, "DOOR LOCK : CONSULT-III Function (BCM -

DOOR LOCK)"

.

• When key inserted in front key cylinder is turned to LOCK:

• When key inserted in front key cylinder is turned to UNLOCK:

Without CONSULT-III

1.

Turn ignition switch OFF.

2.

Check voltage between BCM connector M18 terminals 7, 8 and
ground.

Monitor item

Condition

KEY CYL LK-SW

Lock

: ON

Neutral / Unlock

: OFF

KEY CYL UN-SW

Unlock

: ON

Neutral / Lock

: OFF

KEY CYL LK-SW

: ON

KEY CYL UN-SW

: ON

Connector

Terminals

Condition

Voltage (V)

(Approx.)

(+)

(–)

WIIA0457E

KEY CYLINDER SWITCH

SEC-29

< COMPONENT DIAGNOSIS >

C

D

E

F

G

H

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J

L

M

A

B

SEC

N

O

P

Is the inspection result normal?

YES

>> Front door lock assembly LH (key cylinder switch) signal is OK.

NO

>> GO TO 2.

2.

CHECK FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH)

1.

Turn ignition switch OFF.

2.

Disconnect front door lock assembly LH (key cylinder switch).

3.

Check continuity between front door lock assembly LH (key cyl-
inder switch) connector D14 terminals 3, 4 and 5.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace front door lock assembly LH (key cylinder switch). Refer to 

DLK-135, "Removal and

Installation"

.

3.

CHECK FRONT DOOR LOCK ASSEMBLY LH HARNESS

1.

Disconnect BCM.

2.

Check continuity between BCM connector M18 terminals 7, 8
and front door lock assembly LH connector D14 terminals 3, 5.

3.

Check continuity between BCM connector M18 terminals 7, 8
and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness.

4.

CHECK FRONT DOOR LOCK ASSEMBLY LH GROUND

Check continuity between front door lock assembly LH connector
D14 terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness.

M18

7

Ground

Neutral/Lock

5

Unlock

0

8

Neutral/Unlock

5

Lock

0

Terminals

Condition

Continuity

4 – 5

Key is turned to LOCK.

Yes

Key is in N position or turned to UN-

LOCK

No

3 – 4

Key is turned to UNLOCK.

Yes

Key is in N position or turned to LOCK

No

WIIA0458E

7 - 3

: Continuity should exist.

8 - 5

: Continuity should exist.

7 - Ground

: Continuity should not exist.

8 - Ground

: Continuity should not exist.

WIIA0676E

4 - Ground

: Continuity should exist.

WIIA0677E

SEC-30

< COMPONENT DIAGNOSIS >

KEY CYLINDER SWITCH

5.

CHECK BCM OUTPUT VOLTAGE

1.

Connect BCM.

2.

Check voltage between BCM connector M18 terminals 7, 8 and
ground.

Is the inspection result normal?

YES

>> Check condition of the harness and connector.

NO

>> Replace BCM. Refer to 

BCS-54, "Removal and Installa-

tion"

.

7 - Ground

: Approx. 5V

8 - Ground

: Approx. 5V

WIIA0457E

HORN FUNCTION

SEC-31

< COMPONENT DIAGNOSIS >

C

D

E

F

G

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J

L

M

A

B

SEC

N

O

P

HORN FUNCTION

Symptom Table

INFOID:0000000005272615

HAZARD AND HORN REMINDER FUNCTION MALFUNCTION

NOTE:
• Before performing the diagnosis in the following table, check “Work flow”. Refer to 

SEC-3, "Work Flow"

.

• If the following symptoms” are detected, check systems shown in the “Diagnosis/service procedure” column

in this order.

Conditions of Vehicle (Operating Conditions)

• “ANSWER BACK FUNCTION” is ON when setting on CONSULT-III.
• Ignition switch is in OFF position.
• All doors are closed.

Symptom

Diagnosis/service procedure

Reference 

page

Hazard reminder does not operate by keyfob.
(Horn reminder operate.)

1.

Check “HAZARD ANSWER BACK” setting in “WORK 
SUPPORT”.

DLK-21

2.

Check hazard function.

EXL-72

3.

Check keyfob battery inspection.

DLK-51

Horn reminder does not operate by keyfob.
(Hazard reminder operate.)

1.

Check “HORN WITH KEYLESS LOCK” setting in 
“WORK SUPPORT”.

DLK-21

2.

Check horn function.

HRN-3

3.

Check Intermittent Incident.

GI-46