1998 NISSAN PATROL power supply

TEL485A
POWER SUPPLY ROUTING
Wiring Diagram Ð POWER Ð (Cont'd)
EL-12

TEL486A
POWER SUPPLY ROUTING
Wiring Diagram Ð POWER Ð (Cont'd)
EL-13

Fuse
a. If fuse is blown, be sure to eliminate cause of problem
before installing new fuse.
b. Use fuse of speci®ed rating. Never use fuse of more than
speci®ed rating.
c. Do not partially install fuse; always insert it into fuse
holder properly.
d. Remove fuse for ``ELECTRICAL PARTS (BAT)'' if vehicle is
not used for a long period of time.
Fusible Link
A melted fusible link can be detected either by visual inspection or
by feeling with ®nger tip. If its condition is questionable, use circuit
tester or test lamp.
CAUTION:
+If fusible link should melt, it is possible that critical circuit
(power supply or large current carrying circuit) is shorted.
In such a case, carefully check and eliminate cause of
problem.
+Never wrap outside of fusible link with vinyl tape. Impor-
tant: Never let fusible link touch any other wiring harness,
vinyl or rubber parts.
Circuit Breaker Inspection
For example, when current is 30A, the circuit is broken within 8 to
20 seconds.
CEL083
MEL944F
SBF284E
POWER SUPPLY ROUTING
EL-14

DAYTIME LIGHT IS CALCELED
(Lighting switch in 1st or 2nd position or ignition switch in START position)
+Ignition switch is in START position
+Lighting switch is in 1st or 2nd position.
When one of the above conditions exists, power is supplied
+to base of the transistor-1 in daytime light control unit
+through daytime light control unit terminalj
11orj6.
And then, power supply path to the base transistor-2 is interrupted to cancel daytime light operation.
SEL491V
HEADLAMP Ð Daytime Light System Ð
System Description (Cont'd)
EL-66

Trouble Diagnoses
PRELIMINARY CHECK
CHECK-IN
Can Diagnosis mode
be activated? Refer to
``Meter/Gauge Opera-
tion and Odo/Trip Meter
Segment Check in
Diagnosis Mode'',
EL-108.
Ye s
cNo
Do meter warning
lamps operate?
No
cYe s
Check the screws
securing speedometer
and FPC.
(The screws are
located behind the
combination meter. For
details refer to EL-114.)cCan Diagnosis mode
be activated?
Nom
Check power supply
and ground circuit.
Refer to ``POWER
SUPPLY AND
GROUND CIRCUIT
CHECK'', EL-111.
Check meter/gauge
operation in Diagnosis
mode.b
Ye s
.
Malfunction is indicated
in Diagnosis mode.No malfunction is indi-
cated in Diagnosis
mode.Replace speedometer
(uni®ed meter control
unit).
Check the following:
+FPC connector con-
nection
Refer to ``Flexible
Print Circuit (FPC)'',
EL-109.
+Screws securing the
malfunctioning
meter/gauge
(The screws are
located behind the
combination meter.
For details refer to
EL-114.)
OK
.
NG
SYMPTOM CHART 2
Refer to EL-111.
SYMPTOM CHART 1
Refer to EL-111.Reconnect FPC connector and check continuity between
check land terminals and/or repair malfunctioning part.
Refer to ``Flexible Print Circuit (FPC)'', EL-109.
.
.
.
..
..
.
METER AND GAUGES
EL-110

SYMPTOM CHART
Symptom chart 1 (Malfunction is indicated in Diagnosis mode)
Symptom Possible causes Repair order
Speedometer and/or odo/trip
meter indicate(s) malfunction
in Diagnosis mode.+Speedometer (Uni®ed meter control unit)+Replace speedometer (uni®ed meter control unit).
Multiple meter/gauge indicate
malfunction in Diagnosis
mode.
One of tachometer/fuel gauge/
water temp. gauge indicates
malfunction in Diagnosis
mode.+Meter/Gauge
+Speedometer (Uni®ed meter control unit)1. Check resistance of meter/gauge indicating malfunction. If
the resistance is NG, replace the meter/gauge. Refer to
``METER/GAUGE RESISTANCE CHECK'', EL-114.
2. If the resistance is OK, replace speedometer (uni®ed meter
control unit).
Symptom chart 2 (No malfunction is indicated in Diagnosis mode)
Symptom Possible causes Repair order
Speedometer and odo/trip
meter are malfunctioning.1. Sensor
- Speedometer, Odo/Trip meter
2. FPC connector
3. Speedometer (Uni®ed meter control unit)1. Check vehicle speed sensor.
INSPECTION/VEHICLE SPEED SENSOR (Refer to EL-112.)
2. Check FPC connector. Refer to ``Flexible Print Circuit
(FPC)'', EL-109.
3. Replace speedometer (uni®ed meter control unit).
Multiple meter/gauge are mal-
functioning. (except
speedometer, odo/trip meter)1. FPC connector
2. Speedometer (Uni®ed meter control unit)1. Check FPC connector. Refer to ``Flexible Print Circuit
(FPC)'', EL-109.
2. Replace speedometer (uni®ed meter control unit).
One of tachometer/fuel gauge/
water temp. gauge is malfunc-
tioning.1. Sensor/Engine revolution signal
- Tachometer
- Fuel gauge
- Water temp. gauge
2. FPC connector
3. Speedometer (Uni®ed meter control unit)1. Check the sensor for malfunctioning meter/gauge.
INSPECTION/ENGINE REVOLUTION SIGNAL (Refer to
EL-113.)
INSPECTION/FUEL TANK GAUGE (Refer to EL-113.)
INSPECTION/THERMAL TRANSMITTER (Refer to EL-114.)
2. Check FPC connector. Refer to ``Flexible Print Circuit
(FPC)'', EL-109.
3. Replace speedometer (uni®ed meter control unit).
Before starting trouble diagnoses above, perform PRELIMINARY CHECK, EL-110.
POWER SUPPLY AND GROUND CIRCUIT CHECK
Power supply circuit check
Terminals Ignition switch position
Å@OFF ACC ON
j
33GroundBattery
voltageBattery
voltageBattery
voltage
j
9Ground 0V 0VBattery
voltage
If NG, check the following.
+7.5A fuse [No.
24, located in fuse block (J/B)]
+10A fuse [No.
28, located in fuse block (J/B)]
+Harness for open or short between fuse and combination meter
SEL419V
METER AND GAUGES
Trouble Diagnoses (Cont'd)
EL-111

System Description
The warning chime is combined with the smart entrance control unit.
Both the ignition key and light warning chime will not sound, when ignition switch in the ON or START posi-
tion. (When power supply exists at smart entrance control unit terminalj
12.)
IGNITION KEY WARNING CHIME
With the key in the ignition key cylinder, the ignition switch in the OFF or ACC position, and the driver's door
open, the warning chime will sound. A battery positive voltage is supplied
+from key switch terminalj
1
+to smart entrance control unit terminalj1.
Ground is supplied
+through driver side door switch
+to smart entrance control unit terminalj
7.
LIGHT WARNING CHIME
With ignition switch in the OFF or ACC position, driver's door open, and lighting switch in 1ST or 2ND position,
warning chime will sound. A battery positive voltage is supplied
+from lighting switch terminalj
12or daytime light control unit
+to smart entrance control unit terminalj
14.
Ground is supplied
+through driver side door switch
+to smart entrance control unit terminalj
7.
WARNING CHIME
EL-135

DIAGNOSTIC PROCEDURE 2
(Key switch input signal check)
CHECK KEY SWITCH INPUT SIGNAL.
Check voltage between control unit termi-
nalj
1and ground.
OK
cNG
Check the following.
+Key switch
Refer to ``Electrical Com-
ponents Inspection'' (EL-
140).
+7.5A fuse [No.
24,
located in fuse block
(J/B)]
+Harness for open or
short between key
switch and fuse
+Harness for open or
short between control
unit and key switch
Go to DIAGNOSTIC PROCEDURE 3.
Condition of key switch Voltage [V]
Key is inserted. Approx. 12
Key is withdrawn. 0
DIAGNOSTIC PROCEDURE 3
CHECK POWER SUPPLY CIRCUIT FOR
CONTROL UNIT.
Check voltage between control unit termi-
nalsj
11,j12and ground.
OK
cNG
Check the following.
+
M92circuit breaker
+7.5A fuse [No.8,
located in the fuse block
(J/B)]
+Harness for open or
short
CHECK GROUND CIRCUIT FOR CON-
TROL UNIT.
Check continuity between control unit ter-
minalj
18and ground.
Continuity should exist.
OK
cNG
Repair harness or connec-
tors.
CHECK DOOR SWITCH INPUT SIGNAL.
Check voltage between control unit termi-
nalj
7and ground.
OK
cNG
Check the following.
+Driver side door switch
Refer to ``Electrical Com-
ponents Inspection'' (EL-
140).
+Door switch ground cir-
cuit
+Harness for open or
short between control
unit and door switch
Replace control unit.
Terminals Ignition switch position
Å@OFF ACC ON
j
11Ground Approx. 12V
j
12Ground 0V 0V Approx. 12V
Condition of driver's door Voltage [V]
Driver side door is closed. Approx. 12
Driver side door is open. 0
SEL852UB
SEL853UB
SEL854UB
SEL855UB
.
.
.
.
WARNING CHIME
Trouble Diagnoses (Cont'd)
EL-139