Isuzu KB P190. 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)