Nissan Frontier. Manual - part 1307

WCS

KEY SWITCH SIGNAL CIRCUIT

WCS-23

< DTC/CIRCUIT DIAGNOSIS >

C

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B

A

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1. Disconnect BCM connector M18 and key switch connector.

2. Check continuity between BCM harness connector M18 (A) ter-

minal 37 and key switch harness connector M27 (B) terminal 1.

3. Check continuity between BCM harness connector M18 (A) ter-

minal 37 and ground.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair or replace harness.

4.

 CHECK KEY SWITCH POWER SUPPLY CIRCUIT

Check voltage between key switch harness connector M27 terminal

2 and ground.

Is the inspection result normal?

YES

>> Replace key switch.

NO

>> Repair or replace harness.

Component Inspection

INFOID:0000000009478009

1.

 CHECK KEY SWITCH

1. Turn ignition switch OFF.

2. Disconnect key switch.

3. Check continuity between key switch terminals 1 and 2.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace key switch.

BCM

Key switch

Continuity

Connector

Terminal

Connector

Terminal

M18 (A)

37

M27 (B)

1

Yes

BCM

Ground

Continuity

Connector

Terminal

M18 (A)

37

No

WKIA4102E

Terminals

Voltage

(Approx.)

(+)

(

−)

Key switch

Terminal

M27

2

Ground

Battery voltage

WKIA4103E

1 – 2
When key is inserted 
into key cylinder

: Continuity should exist.

When key is removed 
from key cylinder

: Continuity should not exist.

WCS-24

< ECU DIAGNOSIS INFORMATION >

COMBINATION METER

ECU DIAGNOSIS INFORMATION

COMBINATION METER

Reference Value

INFOID:0000000010217871

TERMINAL LAYOUT

PHYSICAL VALUES

LKIA0698E

Termi-

nal

Wire 

color

Item

Condition

Reference value (V)

(Approx.)

Ignition 

switch

Operation or condition

2

P

Generator

ON

Generator voltage low

0

Generator voltage normal

Battery voltage

3

R/Y

Battery power supply

—

—

Battery voltage

4

B/Y

Fuel level sensor ground

ON

—

0

5

W

Vehicle speed signal out-
put (2-pulse)

ON

Speedometer operated
[When vehicle speed is ap-
prox. 20 km/h (12 MPH)]

240 Hz

6

SB

Vehicle speed signal out-
put (8-pulse)

ON

Speedometer operated
[When vehicle speed is ap-
prox. 40 km/h (25 MPH)]

NOTE:
Maximum voltage may be 12V due to spec-
ifications (connected units).

7

G

Transmission ragne sig-
nal

ON

Shift lever: P or N

0

Shift lever: Except above

Battery voltage

9

BR

Fuel level sensor signal

—

—

Refer to 

MWI-12, "FUEL GAUGE : System 

Description"

.

11

P

CAN-L

—

—

—

12

L

CAN-H

—

—

—

13

GR

Ground

—

—

0

16

W/G

Ignition switch ON or 
START

ON

—

Battery voltage

17

B

AT-PN switch

—

—

—

18

L

AT 1 Range switch

—

—

—

20

Y

O/D off switch

ON

O/D off switch ON

0

O/D off switch OFF

Battery voltage

22

BR

Illumination control 
switch

—

—

Refer to 

INL-74, "System Description"

.

PKIC0643E

WCS

COMBINATION METER

WCS-25

< ECU DIAGNOSIS INFORMATION >

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Fail Safe

INFOID:0000000010217872

The combination meter performs a fail-safe operation for the functions listed below when communication is

lost.

23

B

Ground

—

—

0

24

V

Seat belt buckle switch 
LH

ON

Unfastened (ON)

0

Fastened (OFF)

Battery voltage

25

SB

DIFF LOCK indicator in-
put

ON

DIFF LOCK indicator ON

0

DIFF LOCK indicator OFF

Battery voltage

31

G

Parking brake switch

ON

Parking brake applied

0

Parking brake released

Battery voltage

32

SB

Brake fluid level switch

ON

Brake fluid level low

0

Brake fluid level normal

Battery voltage

34

L

Washer fluid level switch

ON

Washer fluid level low

0

Washer fluid level normal

Battery voltage

37

SB

Air bag warning lamp in-
put

ON

Air bag warning lamp ON

4

Air bag warning lamp OFF

0

39

G

Security indicator input

OFF

Security indicator ON

0

Security indicator OFF

Battery voltage

40

LG

Seat belt buckle switch 
RH

ON

Unfastened (ON)

0

Fastened (OFF)

Battery voltage

Termi-

nal

Wire 

color

Item

Condition

Reference value (V)

(Approx.)

Ignition 

switch

Operation or condition

Function

Specifications

Speedometer

Zero indication.

Tachometer

Fuel gauge

Engine coolant temperature gauge

Engine oil pressure gauge (with 6 gauge combination meter)

Voltage gauge (with 6 gauge combination meter)

Illumination control

Meter illumination

Change to nighttime mode when communication is lost.

Segment LCD

Odometer

Freeze current indication.

A/T position

Display turns off.

Buzzer

Buzzer turns off.

WCS-26

< ECU DIAGNOSIS INFORMATION >

COMBINATION METER

DTC Index

INFOID:0000000010217873

NOTE:

“TIME” indicates the following.

• 0: Indicates that a malfunction is detected at present.

• 1-63: Indicates that a malfunction was detected in the past. (Displays number of ignition switch OFF 

→ ON

cycles after malfunction is detected. Self-diagnosis result is erased when “63” is exceeded.)

Warning lamp/indicator lamp

ABS warning lamp

Lamp turns on when communication is lost.

Brake warning lamp

VDC OFF indicator lamp

Malfunction indicator lamp

SLIP indicator lamp

AT oil temp warning lamp

Lamp turns off when communication is lost.

Low washer fluid warning lamp

Hill descent control indicator lamp

Door open warning lamp

CRUISE indicator lamp

SET indicator lamp

O/D OFF indicator lamp

Oil pressure warning lamp

Air bag warning lamp

High beam indicator

Turn signal indicator lamp

Driver and passenger seat belt warn-
ing lamp

Lamp turns off when disconnected.

Charge warning lamp

Security indicator lamp

4WD indicator lamp

ATP indicator lamp

Differential lock indicator lamp

Low tire pressure warning lamp

Lamp will flash every second for 1 minute and then stay on con-
tinuously thereafter.

Function

Specifications

CONSULT display

Malfunction

Reference 

page

CAN COMM CIRC 
[U1000]

Malfunction is detected in CAN communication.

CAUTION:

Even when there is no malfunction on CAN communication system, malfunction may be 
misinterpreted when battery has low voltage (when maintaining 7 - 8 V for about 2 sec-
onds) or 10A fuse [No. 19, located in the fuse block (J/B)] is disconnected.

MWI-29

VEHICLE SPEED 
CIRC
[B2205]

Malfunction is detected when an erroneous speed signal is input.

CAUTION:

Even when there is no malfunction on speed signal system, malfunction may be misin-
terpreted when battery has low voltage (when maintaining 7 - 8 V for about 2 seconds). 

MWI-30