Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1375
ELECTRICAL-BODY AND CHASSIS 8-65
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
8-66 ELECTRICAL-BODY AND CHASSIS
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
ELECTRICAL-BODY AND CHASSIS 8-67
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
4
X-1
- 14
C-42
Voltage between
14
C-42
- 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
8-68 ELECTRICAL-BODY AND CHASSIS
TAIL LIGHT, LICENSE PLATE LIGHT, CLEARANCE LIGHT AND ILLUMINATION
CONTROLLER
1. All lights do not light
Checkpoint
Trouble Cause
Countermeasure
Repair or replace the
combination switch
Lighting switch continuity
between connector
8
C-42
- 7
C-42
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. EB-12
Fuse No. EB-12 (15A, 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
T-6
- 4
T-6
(RH)
or 3
T-1
- 4
T-1
(LH)
Open circuit or poor connector
contact
NG
OK
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