Isuzu N-Series. Service manual — part 1030
CAB AND CHASSIS ELECTRICAL 8-225
All the Doors Do Not Lock and Unlock
All the Doors Do Not Get Locked (or Unlocked)
N8A5256E
N8A5257E
8-226 CAB AND CHASSIS ELECTRICAL
Driver Side Door Does Not Get Locked (or Unlocked)
FRT Passenger Side Door Does Not Get Locked (or Unlocked)
RR Door-RH Side Does Not Get Locked (or Unlocked)
RR Door-LH Side Does Not Get Locked (or Unlocked)
REPLACE THE DOOR LOCK SWITCH
N8A0216E
REPLACE THE DOOR LOCK ACTUATOR
N8A0217E
CAB AND CHASSIS ELECTRICAL 8-227
Inspection of The Door Lock Circuit
Check the voltage and the continuity between the controller harness side connector terminals.
Termi-
Item
Connect-
Wire
nal
Connected to
to be
ing
Checking conditions
Standard
color
No.
checked
terminal
Unlock
Continuity
1
R/G
1-Ground
Lock
No continuity
Unlock
No continuity
2
G/B
2-Ground
Lock
Continuity
3
B
Ground
3-Ground
-
Continuity
Continuity
4
BR/Y
Actuator
4-5
-
(There is some
(Unlock)
resistance)
Continuity
5
BR/R
Actuator
5-4
-
(There is some
(Lock)
resistance)
6
R
Fuse F-7 (15A)
Voltage
6-Ground
-
Battery voltage
Conti-
nuity
(Resis-
tance)
Door lock SW
(Unlock)
Door lock SW
(Lock)
Driver seat side
door
Driver seat side
door
Harness side
1
2
3
4
5
6
B-12
N8A0218E
8-228 CAB AND CHASSIS ELECTRICAL
Door Lock Relay
The door lock controller sends out to each door lock ac-
tuator the lock/unlock signals received from door lock
switch of driver seat side.
Inspection
Remove the connector of the door lock controller, and
check the continuity and the voltage between the con-
troller side connector terminals.
(Connect the (+) terminal of the battery to 6
and
the (
−) terminal to 3
.)
3
— 5
. . . . .Continuity
3
— 4
. . . . .Continuity
(Then, ground 2
.)
5
. . . . ..Voltage for approx. 1 second
(Disconnect the ground of 2
, and ground 1
.)
4
. . . . ..Voltage for approx. 1 second
Replace the controller when the result of inspection is
found abnormal.
Door Lock Operation Test
After confirming that there is continuity between the har-
ness side connector terminals 4
and 5
of the
door lock controller, apply battery voltage to each of the
terminals to conduct the operation test.
When the door lock will not operate, check the door lock
actuator for any trouble.
For 24 Volt
For 12V
N8A0219E
B-12
B-12
B-12
B-12
B-12
B-12
B-12
B-12
B-12
B-12
B-12
B-12
Controller side
3
2
1
6
5
4
N8A0220E
B-12
B-12
Connecting terminal
4 (BR/Y)
5 (BR/R)
Operation
Unlock
Lock
Harness
side
1
2
3
4
5
6
B-12
N8A0221E
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