Nissan Frontier. Manual — part 1307
WCS
KEY SWITCH SIGNAL CIRCUIT
WCS-23
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
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
.
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
PKIC0643E
WCS
COMBINATION METER
WCS-25
< ECU DIAGNOSIS INFORMATION >
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
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.
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).
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