Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1381

ELECTRICAL-BODY AND CHASSIS  8-89

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

8-90  ELECTRICAL-BODY AND CHASSIS

HORN

1. Both sides of horn do not sound

Checkpoint

Trouble Cause

Countermeasure

Repair the grounding point

Poor ground contact

NG

Horn relay

Grounding point

Reinstall or replace fuse No.

EB-2 (10A)

Fuse No EB-2 (10A, Relay

and fuse box)

Poor fuse contact or blown

fuse

NG

OK

OK

Reinstall or replace the horn

relay

Poor relay contact or faulty

horn relay

NG

Voltage between connector
2 

X-4

 - ground or 5 

X-4

- ground (Should be battery
voltage present)

OK

Repair open circuit or

reconnect the connector

Open circuit or poor connector

contact between fuse No. EB-

2 (10A) and horn relay

NG

Remove steering pad and

steering wheel

OK

Horn switch continuity

OK

Repair or replace the horn

switch

Poor switch point contact or

faulty switch

NG

Continuity between

4 

X-4

 - 12 

C-42

1 

X-4

 - 1 

C-20

 (1 

C-21

)

OK

Repair open circuit or

connector contact

Open circuit or poor connector

contact

NG

ELECTRICAL-BODY AND CHASSIS  8-91

2. One side of horn does not blow

Checkpoint

Trouble Cause

Countermeasure

Repair open circuit or

reconnect the connector

Open circuit or poor connector

contact

NG

Voltage between 1 

C-20

(1 

C-21

) - ground with

horn switch depressed

(Should be battery voltage

present)

Replace the horn assembly

Horn continuity between

connectors

Faulty horn assembly

NG

OK

3. Insufficient horn volume

Clfean and/or remove the

foreign material

Stain foreign material in the

horn

NG

Horn

Recharge or replace the

battery

Battery condition

Discharged battery

NG

OK

8-92  ELECTRICAL-BODY AND CHASSIS

 

  REMOVAL AND INSTALLATION

REAR COMBINATION LIGHT
Stoplight

Removal

1. Open the rear gate.

2. Remove the screws of rear combination light.

3. Remove the rear combination light assembly.

4. Turn the bulb 

2

 counterclockwise to remove it.

Installation

Follow the removal procedure in the reverse order to install the
rear combination light.
Pay close attention to the important points mentioned in the
following paragraphs.

Bulb

Be absolutely sure that each bulb is correctly installed.
This will prevent a poor contact and an open circuit.