Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1300
8–120 ELECTRICAL-BODY AND CHASSIS
TROUBLE SHOOTING
HEADLIGHT
1.
Both the headlights (high and low beam) do not light
Checkpoint
Trouble Cause
Countermeasure
Poor ground point contact
Repair the wiring
Ground point contact (C-2)
Poor switch contact or sw
faulty
Repair or replace the
combination switch
Combination switch
continuity
Poor relay contact or relay
faulty
Reinstall or replace the
lighting relay
Lighting relay
Open circuit between
battery positive terminal
and lighting relay
Repair open circuit
Voltage between
5 X-1 -
ground
and
2 X-1 -
ground
Open circuit between
lighting relay and lighting
switch
Repair open circuit or
connector contact
Voltage between 1 C-42 -
ground
Open circuit
Repair open circuit
Wiring continuity between
7 C-42 - C-2 and
16 C-42 - C-2
NG
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
ELECTRICAL-BODY AND CHASSIS 8–121
2.
High or low beam does not light on both headlights
Checkpoint
Trouble Cause
Countermeasure
3.
RH (or LH) high and low beam does not light
Poor switch contact or
switch faulty
Repair or replace the
combination switch
Dimmer · passing switch
continuity
Open circuit between
headlight and dimmer ·
passing switch
Repair open circuit or
connector contact
Voltage between
13 C-42 - ground and
15 C-42 - ground
Poor installation or blown
fuse
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)
Blown filament or air
leakage
Replace the headlight bulb
Headlight connector
continuity
Open circuit and/or poor
connector contact
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
NG
OK
OK
OK
NG
NG
NG
4.
High or low beam does not light on one headlight (RH or LH)
Blown filament
Replace the headlight
assembly
Headlight connector
continuity
Open circuit between
headlight and dimmer ·
passing switch
Repair open circuit or
connector contact
Wiring continuity between
headlight and dimmer ·
passing switch
OK
NG
NG
NG
8–122 ELECTRICAL-BODY AND CHASSIS
5.
Headlight does not go out
Checkpoint
Trouble Cause
Countermeasure
6.
Insufficient headlight brightness
Relay point fused
Replace the lighting relay
Lighting relay continuity
between connector 1 X-1
- 5 X-1 (Should be no
continuity)
Switch point fused or faulty
Replay the combination
switch
Lighting switch continuity
between connector 1 C-42
- 7 C-42 when switch is OFF
(Should be no continuity)
Lens dirty
Clean the light lens
Headlight lens
Bulb filament faulty
Replace the headlight bulb
Headlight bulb
Poor ground point contact
Repair the wiring
Dimmer · passing switch
wire continuity between con-
nector 16 C-42 - C-2
NG
OK
OK
OK
NG
Switch point fused or faulty
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)
OK
NG
Short circuit
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
OK
NG
NG
NG
NG
ELECTRICAL-BODY AND CHASSIS 8–123
7.
Passing light does not function when dimmer switch is operated
Checkpoint
Trouble Cause
Countermeasure
8.
Headlight beam does not change when dimmer switch is operated
Poor switch point contact
Repair or replace the
dimmer switch
Dimmer switch
Open circuit
Repair open circuit between
4 X-1 -
14 C-42
Voltage between
14 C-42 - ground (Should
be battery voltage present)
Loose beam lever or
foreign material in switch
Repair or replace the
dimmer switch
Dimmer switch
NG
OK
NG
NG
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