2000 NISSAN PATROL Electronic Repair Manual

Before starting trouble diagnoses below, perform preliminary check, EL-1138.
Symptom numbers in the symptom chart correspond with those of Preliminary check.
SYMPTOM CHART
REFERENCE PAGE EL-1140 EL-1141 EL-1142 EL-1143 EL-1144 EL-1145 EL-1146 EL-1147 EL-1148 EL-1148
SYMPTOM
Power supply and ground circuit check
Procedure 1
(Door unlock sensor check)
Procedure 2
(Door key cylinder switch check)
Procedure 3
(Door lock and unlock switch check)
Procedure 4
(Door lock actuator check)
Procedure 5
(Super lock actuator check)
Procedure 6
(Driver's door switch check)
Procedure 7
(NATS release signal check)
Procedure 8
(Key switch check)
Procedure 9
(Ignition switch ªONº circuit check)
1Power door lock does not operate
using any switch.XX
2Power door lock does not operate
with both door key cylinders.X
3Power door lock does not operate
with door lock and unlock switch.X
4Specific door lock actuator does
not operate.X
5Super lock cannot be set by both
door key cylinders.XXXXX
6Super lock cannot be set by one of
door key cylinders.X
7*Super lock cannot be released by
one or both door key cylinders.X
8*Super lock cannot be released by
ignition key switch. (Signal from
NATS IMMU and ignition switch)XXX
9Specific super lock actuator does
not operate.X
10*Key reminder system does not
operate.XXX
X: Applicable
*: Make sure the power door lock system operates properly.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1139

POWER SUPPLY AND GROUND CIRCUIT CHECK
Main power supply circuit check
Terminals Ignition switch position
Å@OFF ACC ON
V1Ground
Battery
voltageBattery
voltageBattery
voltage
V10Ground
Ground circuit check
Terminals Continuity
V16- Ground Yes
SEL132X
SEL133X
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1140

DIAGNOSTIC PROCEDURE 1
(Door unlock sensor check)
CHECK DOOR UNLOCK SENSOR
INPUT SIGNAL.
Check voltage between super lock control
unit terminals
V28orV29and ground.
Refer to wiring diagram in EL-1130
(LHD), EL-1135 (RHD).
NG
cOK
Door unlock sensor is OK.
CHECK DOOR UNLOCK SENSOR.
1. Disconnect door unlock sensor connec-
tor.
2. Check continuity between door unlock
sensor terminals.
OK
cNG
Replace door lock actuator
assembly.
Check the following.
+Door unlock sensor ground circuit
+Harness for open or short between con-
trol unit and door unlock sensor
Terminals
Condi-
tionVoltage
[V]
Å@
Driver
sideV28GroundLockedApprox.
5
Unlocked 0
Pas-
senger
side
V29GroundLockedApprox.
5
Unlocked 0
Terminals Condition Continuity
V2-V5Locked No
Unlocked Yes
SEL134X
SEL814UB.
.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1141

DIAGNOSTIC PROCEDURE 2
(Door key cylinder switch check)
CHECK DOOR KEY CYLINDER SWITCH
INPUT SIGNAL (LOCK/UNLOCK SIG-
NAL).
Check voltage between super lock control
unit terminal
V24orV25and ground.
NG
cOK
Door key cylinder switch is
OK.
CHECK DOOR KEY CYLINDER
SWITCH.
1. Disconnect door key cylinder switch
connector.
2. Check continuity between door key cyl-
inder switch terminals.
OK
cNG
Replace door key cylinder
switch.
Check the following.
+Door key cylinder switch ground circuit
+Harness for open or short between
super lock control unit and door key
cylinder switch
Terminals
Key posi-
tionVoltage
[V]
Å@
V24GroundBetween
neutral
and lock0
Other
positionsApprox. 5
V25GroundBetween
neutral
and
unlock0
Other
positionsApprox. 5
Terminals Key position Continuity
Front LH:
V1-V2
Front RH:
V3-V2
Neutral No
Between
neutral and
lockYes
Front LH:
V3-V2
Front RH:
V1-V2
Neutral No
Between
neutral and
unlockYes
SEL135X
SEL875WA
.
.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1142

DIAGNOSTIC PROCEDURE 3
(Door lock and unlock switch check)
CHECK DOOR LOCK AND UNLOCK
SWITCH INPUT SIGNAL.
Check voltage between control unit termi-
nal
V20orV23and ground.
NG
cOK
Door lock and unlock
switch is OK.
CHECK DOOR LOCK AND UNLOCK
SWITCH.
1. Disconnect door lock and unlock switch
connector.
2. Check continuity between each door
lock and unlock switch terminals.
Power window main switch
[Door lock and unlock switch (with
power window)]
Door lock and unlock switch (without
power window)
OK
cNG
Replace power window
main switch (with power
window) or door lock and
unlock switch (without
power window).
Check the following.
+Ground circuit for power window main
switch [Door lock and unlock switch
(with power window)] or door lock and
unlock switch (without power window)
+Harness for open or short between
power window main switch [Door lock
and unlock switch (with power window)]
or door lock and unlock switch (without
power window) and control unit connec-
tor
TerminalsDoor lock and
unlock switch
conditionVoltage
(V)
V20- GroundLock 0
N and UnlockBattery
voltage
V23- GroundUnlock 0
N and LockBattery
voltage
ConditionTerminals17 18 19
Unlockjj
N No continuity
Lockjj
ConditionTerminals123
Lockjj
N No continuity
Unlockjj
SEL626X
SEL627X
SEL628X
.
.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1143

DIAGNOSTIC PROCEDURE 4
(Door lock actuator check)
CHECK OUTPUT SIGNAL FOR DOOR
LOCK ACTUATOR.
Check voltage for door lock actuator.
Door lock actuator driver
Door lock actuator passenger, rear
and back
Refer to wiring diagram in EL-1132
(LHD), EL-1137 (RHD).
OK
cNG
Door lock actuator is OK.
CHECK DOOR LOCK ACTUATOR.
1. Disconnect door lock actuator connec-
tor.
2. Apply 12V direct current to door lock
actuator and check operation.
Door lock actuator operation
Back door lock actuator operation
NG
cOK
Check harness between
control unit and door lock
actuator.
Replace door lock actuator assembly.
Door lock/unlock
switch conditionTerminals
Voltage
(V)
Å@
Unlock®Lock
V14Ground
Battery
voltage
Lock®Unlock
V11Ground
Door lock/unlock
switch conditionTerminals
Voltage
(V)
Å@
Unlock®Lock
V14Ground
Battery
voltage Lock®Unlock
V4Ground
Door lock actuator operationTermi-
nals
Å@
Unlocked®Locked
V6V3
Locked®UnlockedV3V6
Back door lock actuator operationTermi-
nals
Å@
Unlocked®Locked
V3V1
Locked®UnlockedV1V3
SEL137X
SEL138X
SEL818UB
SEL827UB
SEL434VA
.
.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1144

DIAGNOSTIC PROCEDURE 5
[Super lock actuator (in door lock actuator assembly)
check]
CHECK OUTPUT SIGNAL FOR SUPER
LOCK ACTUATOR.
Check voltage for super lock actuator.
Put the system in set condition before
checking release signal.
Refer to wiring diagram in EL-1131
(LHD), EL-1136 (RHD).
OK
cNG
Super lock actuator is OK.
CHECK SUPER LOCK ACTUATOR.
1. Disconnect door lock actuator assem-
bly connector.
2. Set lever A in Lock position.
3. Apply 12V direct current to door lock
actuator assembly and check opera-
tion.
NG
cOK
Check harness between
control unit and door lock
actuator assembly.
Replace door lock actuator assembly.
Door key cylin-
der switch con-
ditionTerminals
Voltage
(V)
Å@
Lock (Set)
V6Ground
Approx. 12
Unlock
(Released)
V3Ground
Super lock
actuator opera-
tionTermi-
nalsConnection from
lever B to lever
A
Å@
Released®Set
V1V4Disconnect
Set®Released
V4V1Connect
SEL139X
SEL820UB
.
.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1145

DIAGNOSTIC PROCEDURE 6
(Driver's door switch check)
CHECK DOOR SWITCH INPUT SIGNAL.
Check voltage between super lock control
unit terminal
V30and ground.
Refer to wiring diagram in EL-1129
(LHD), EL-1134 (RHD).
NG
cOK
Door switch is OK.
CHECK DOOR SWITCH.
1. Disconnect door switch connector.
2. Check continuity between door switch
terminals.
OK
cNG
Replace door switch.
Check the following.
+Driver side door switch ground condi-
tion
+Harness for open or short between con-
trol unit and door switch
Condition Voltage [V]
Any door is opened. 0
Driver's door is
closed.Approx. 12
Terminals Condition Continuity
Driver
side door
switch
V1-
groundClosed No
Open Yes
SEL140X
SEL141X
.
.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1146