Isuzu KB P190. Manual — part 1275

8A-162 ELECTRICAL-BODY AND CHASSIS

5. Headlight does not go out

Checkpoint

Trouble

Cause

Countermeasure

Replace the lighting relay

Lighting relay continuity
between connector 1

X6

- 2

X6

(Should be no

continuity)

Relay point fused

NG

Replay the combination
switch

Lighting switch continuity
between connector 3

B60

-1

B60

when switch is

OFF(Should be no continuity)

point fused or faulty

NG

OK

OK

Repair or replace the
combination switch

Dimmer

⋅passing switch con-

tinuity between connector
3

B60

- 1

B60

when switch

is not operating
(Should be no continuity)

Switch point fused or faulty

NG

Repair short circuit
between 3

X6

- 3

B60

and 5

X2

- 2

B60

Check if headlight goes out
when connector

C2

,

C36

is disconnected

Short circuit

NG

OK

6. Insufficient headlight brightness

Replace the headlight bulb

Headlight bulb

Bulb filament faulty

NG

Repair the wiring

Dimmer

⋅passing switch

Wire continuity between con-
nector 1

B60

-

C2

Poor ground point contact

NG

OK

Clean the light lens

Headlight lens

Lens dirty

NG

OK

ELECTRICAL-BODY AND CHASSIS 8A-163

7. Passing light does not function when dimmer switch is operated

Checkpoint

Trouble

Cause

Countermeasure

Repair or replace the dimmer
switch

Dimmer switch

Poor switch point contact

NG

Repair open circuit between
3

X6

- 3

B60

Voltage between
3

B60

- ground (Should

be battery voltage present)

Open circuit

NG

OK

8. Headlight beam does not change when dimmer switch is operated

Repair or replace the dimmer

switch

Dimmer switch

Loose beam lever or foreign

material in switch

NG

8A-164 ELECTRICAL-BODY AND CHASSIS

TAIL LIGHT, LICENSE PLATE LIGHT, CLEARANCE LIGHT

1. All lights do not light

Checkpoint

Trouble

Cause

Countermeasure

Repair or replace the

combination switch

Lighting switch continuity

between connector

2

B60

- 1

B60

Poor switch point or connector

contact

NG

Reinstall or replace the tail

relay

Tail relay

Poor relay contact or relay

faulty

NG

OK

Reinstall or replace the fuse

No. EB12 (LH), EB11 (RH)

Fuse No. EB12 (LH) or EB11

(RH) (10A, Relay and fuse

box)

Poor fuse contact or blown

NG

OK

2. Tail light does not light

Replace the bulb or repair
connector contact

Tail light bulb continuity

Bulb burned out or poor
connector contact

NG

Repair open circuit or
connector contact

Continuity between connector
3

F5

- 4

F5

(RH)

or 3

F6

- 4

F6

(LH)

Open circuit or poor connector
contact

NG

OK

ELECTRICAL-BODY AND CHASSIS 8A-165

3. License plate light does not light

Checkpoint

Trouble

Cause

Countermeasure

Repair open circuit or

connector contact

Continuity between
connector 1

T4

- 2

T4

or 1

T3

- 2

T3

Open circuit or poor connector

contact

NG

Replace the bulb or repair

connector contact

License plate light bulb
continuity

Bulb burned out or poor

connector contact

NG

OK

4. Clearance light does not light

Replace the bulb or repair

connector contact

Clearance light bulb continuity

Bulb burned out or poor

connector contact

NG