Isuzu KB P190. Service manual — part 1336
8A-406 ELECTRICAL-BODY AND CHASSIS
CIRCUIT DIAGRAM 4JH1 (LHD) WITHOUT ANTI THEFT G.EXP TYPE
RTW78AXF013701
ELECTRICAL-BODY AND CHASSIS 8A-407
TROUBLESHOOTING
QUICK CHART FOR CHECK POINTS
Check Points
Fuse
C21
(20A)
Power
Window &
Door Lock
Switch
Door
Lock
Switch
Key Cylinder
switch
Door Lock Actuator
Cable
Trouble Mode
Driver’s
side
Driver’s
side
D/S P/S
Passen
ger’s
side
RR-RH RR-LH
Harness
1. All the doors do not
lock and unlock
2. All the doors do not
get locked (or
unlocked)
3. Driver’s side door
does not get locked
(or unlocked)
4. FRT passenger’s side
door does not get
locked (or unlocked)
5. RR door-RH does not
get locked (or
unlocked)
6. RR door-LH does not
get locked (or
unlocked)
7. Door lock does not
operate when
operating from the
driver’s seat side
8A-408 ELECTRICAL-BODY AND CHASSIS
1. All the doors do not lock and unlock
Checkpoint
Trouble
Cause
Countermeasure
Reinstall or replace the fuse
No. C21 (20A)
Poor fuse contact or blown
NG
Repair grounding point contact
Grounding point
C2
Poor grounding point contact
Repair open circuit or
connector contact
Voltage between the driver’s
side power window & door
lock SW harness side
connector terminal 1
D5
and the ground (Should be
battery voltage present)
Open circuit or poor connector
contact
NG
NG
OK
OK
OK
Fuse No. C21 (20A, Fuse box)
Repair open circuit or
connector contact
Open circuit or poor connector
contact
NG
Replace the driver’s side
power window & door lock
SW.
Driver’s side power window &
door lock SW. function
SW. malfunction
NG
OK
Continuity between 3 or 4
D4
or 2
D24
and
C2
2. All the doors do not get locked (or unlocked)
Repair open circuit or
connector contact
Open circuit or poor connector
contact
NG
Replace the driver’s side
power window & door lock
SW.
Driver’s side power window &
door lock SW. function
SW. malfunction
NG
OK
Continuity between the driver’s
side power window & door
lock SW harness side
connector terminals 14
D20
and 6
D20
ELECTRICAL-BODY AND CHASSIS 8A-409
3. Driver’s side door does not get locked (or unlocked)
Checkpoint
Trouble
Cause
Countermeasure
Replace the door lock SW.
Door lock SW. function
SW. malfunction
NG
4. FRT passenger’s side door does not get locked (or unlocked)
Replace the FRT passenger’s
side door lock actuator
FRT passenger’s side door
lock actuator function
Actuator malfunction
NG
5. RR door-RH does not get locked (or unlocked)
Replace the RR door lock
actuator-RH
RR door lock actuator-RH
function
Actuator malfunction
NG
6. RR door-LH does not get locked (or unlocked)
Replace the RR door lock
actuator-LH
RR door lock actuator-LH
function
Actuator malfunction
NG
7. Door lock does not operate when operated from the driver’s seat side
Repair grounding point
C2
contact
Poor grounding point contact
NG
Replace the door lock position
SW.
Continuity between the door
lock position SW. side
connector terminals 1
D4
, 5
D4
and 3
D4
or 1
D24
and 2
D24
and 4
D4
when the SW is locked and 2
D4
and 4
D4
, 6
D4
and 3
D4
or 3
D4
and 2
D24
when the SW. unlocked
SW. malfunction
NG
OK
Grounding point
C2
(RHD),
C109
(LHD)
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