Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1193
8-112 ELECTRICAL-BODY AND CHASSIS
ELECTRICAL-BODY AND CHASSIS 8-113
TROUBLE SHOOTING
HEADLIGHT
1. Both the headlights (high and low beam) do not light
Checkpoint
Trouble
Cause
Countermeasure
Repair the wiring
Poor ground point contact
NG
Repair open circuit or
connector contact
Repair open circuit
Repair or replace the
combination switch
Voltage between 1
C-42
-
ground
Open circuit between lighting
relay and lighting switch
Open circuit between battery
positive terminal and lighting
relay
Combination switch continuity
Poor switch contact or sw
faulty
Voltage between
5
X-1
- ground and
2
X-1
- ground
Reinstall or replace the
lighting relay
Lighting relay
Poor relay contact or relay
faulty
NG
NG
NG
NG
OK
OK
OK
OK
Ground point contact (C-2)
Repair open circuit
Wiring continuity between
7
C-42
-
C-2
and
16
C-42
-
C-2
Open circuit
NG
OK
8-114 ELECTRICAL-BODY AND CHASSIS
2. High or low beam does not light on both headlights
Checkpoint
Trouble
Cause
Countermeasure
Repair or replace the
combination switch
Dimmer
×passing switch
continuity
Poor switch contact or switch
faulty
NG
Repair open circuit or
connector contact
Voltage between
13
C-42
- ground and
15
C-42
- ground
Open circuit between
headlight and dimmer
×passing
switch
NG
OK
3. RH (or LH) high and low beam does not light
Replace the headlight bulb
Headlight connector continuity
Blown filament or air leakage
NG
Repair or replace the wire
and/or connector
Wiring continuity between
connector 3
C-19
- fuse No.
EB-9 or 3
C-26
fuse No.
EB-8
Open circuit and/or poor
connector contact
NG
OK
Reinstall or replace fuse No.
EB-8 or No. EB-9
Fuse No. EB-8 (10A) or
No. EB-9 (10A) (Relay and
fuse box)
(No. EB-9 RH, No. EB-8: LH)
Poor installation or blown fuse
NG
OK
4. High or low beam does not light on one headlight (RH or LH)
Replace the headlight
assembly
Headlight connector continuity
Blown filament
NG
Repair open circuit or
connector contact
Wiring continuity between
headlight and dimmer
×passing
switch
Open circuit between
headlight and dimmer
×passing
switch
NG
OK
ELECTRICAL-BODY AND CHASSIS 8-115
5. Headlight does not go out
Checkpoint
Trouble
Cause
Countermeasure
Replace the lighting relay
Lighting relay continuity
between connector 1
X-1
- 5
X-1
(Should be no
continuity)
Relay point fused
NG
Replay the combination switch
Lighting switch continuity
between connector 1
C-42
-7
C-42
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
14
C-42
- 16
C-42
when
switch is not operating
(Should be no continuity)
Switch point fused or faulty
NG
Repair short circuit
between 4
X-1
- 1
C-42
and 4
X-1
- 14
C-42
Check if headlight goes out
when connector
C-42
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 16
C-42
-
C-2
Poor ground point contact
NG
OK
Clean the light lens
Headlight lens
Lens dirty
NG
OK
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