Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1203

8-152  ELECTRICAL-BODY AND CHASSIS 

3.  High mounted stoplight does not light 
 

Checkpoint  

Trouble 

Cause 

 

Countermeasure 

 

Repair or replace the high
mounted stoplight

Continuity between 1 

L-5

 -

1 

L-6

High mounted stoplight
malfunction

NG

Repair an open circuit or
connector contact between
1 

L-5

 - 8 

H-8

Voltage between 1 

L-5

 -

ground with brake pedal
depressed
(Should be battery voltage
present)

Open circuit or poor connector
contact

NG

OK

Repair grounding point
(

B-28

) contact

Grounding point (

B-28

)

Poor grounding point contact

NG

OK

 

 
 

ELECTRICAL-BODY AND CHASSIS  8-153 

TURN SIGNAL LIGHT AND HAZARD WARNING LIGHT 

1.  Turn signal light does not light on both sides (RH and LH) 
 

Checkpoint  

Trouble 

Cause 

 

Countermeasure 

 

Replace the flasher unit

Flasher unit malfunction

NG

Repair or replace the
combination switch

Turn signal switch continuity
between connector
3 

C-42

 - 4 

C-42

 and

3 

C-42

 - 5 

C-42

 when

turn signal switch operates

Short circuit between
connector 1 

C-45

 - 2 

C-45

when turn signal switch
operates with starter switch
in “ON” position (Turn
signal light should be ON)

Poor switch point contact or
faulty switch

NG

OK

Reinstall or replace fuse No.
CB-11 (15A)

Fuse No. CB-11 (15A, Fuse
box)

Poor fuse contact or blown
fuse

NG

OK

OK

Repair open circuit or
connector contact

Continuity between
connector 3 

C-45

 -ground

(Should be continuity)

Open circuit or poor connector
contact

NG

 

 
 

8-154  ELECTRICAL-BODY AND CHASSIS 

2.  Turn signal light does not light on one side (RH or LH) 
 

Checkpoint  

Trouble 

Cause 

 

Countermeasure 

 

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG

(LH)
Continuity between
2 

C-25

 - 4 

C-42

 (FRT),

1 

C-1

 - 4 

C-42

 (SIDE)

1 

T-6

 - 4 

C-42

 (RR)

(RH)
Continuity between
2 

C-22

 - 5 

C-42

 (FRT),

1 

C-1

 - 5 

C-42

 (SIDE)

1 

T-6

 - 5 

C-42

 (RR)

Repair or replace the
combination switch

Turn signal switch continuity

Poor switch point contact or
faulty switch

NG

OK

OK

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG

 

 
 
3.  Hazard warning light does not light 
 

Repair or replace the hazard
SW.

Hazard SW. malfunction

NG

Voltage between 2 

B-16

 -

ground (Should be battery
voltage present)

Hazard SW. continuity

Reinstall or replace the fuse
No. EB-1 (15A)

Fuse No. EB-1 (15A, Relay
and fuse box)

Poor fuse contact or blown
fuse

NG

OK

OK

Repair open circuit or
connector contact

Open circuit or poor
connector contact between
fuse No. EB-1 (15A) -
2 

B-16

NG

 

 
 
4.  Flashing rate too fast (One side) 
 

Replace the bulb or repair
open circuit

Inspect bulb

Burned out bulb

NG

 

ELECTRICAL-BODY AND CHASSIS  8-155 

BACKUP LIGHT 

1.  Backup light does not light on one side (RH or LH) 
 

Checkpoint  

Trouble 

Cause 

 

Countermeasure 

 

Repair grounding point contact

Poor ground contact

NG

Grounding point

Replace the bulb or repair
connector contact

Backup light bulb continuity

Burned out bulb or poor
connector contact

NG

OK

 

 
 
2.  Backup light does not light on both sides 
 

Repair or replace the switch

Poor switch point contact of
faulty switch

NG

Voltage between 5 

T-1

(5 

T-6

) - ground with

starter switch ON and shift
lever into reverse position
(Should be battery voltage
present)

Back up light switch (mode
switch) continuity

Reinstall or replace fuse No.
CB-11 (15A)

Fuse No. CB-11 (15A, Fuse
box)

Poor fuse contact or blown
fuse

NG

OK

OK

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG