Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1144

ELECTRICAL-BODY AND CHASSIS  8-333

TROUBLE SHOOTING

Rear defogger inoperative

Checkpoint

Trouble Cause

Countermeasure

Reinstall or replace the fuse

No. CB-7 (15A) (RHD: fuse

No. CB-5 (15A))

Poor fuse contact or blown

NG

Reinstall or replace the fuse

No. CB-13 (15A)

Fuse No. CB-13 (15A, Fuse

box)

Poor fuse contact or blown

Replace the rear defogger

switch

Rear defogger switch function

Switch malfunction

NG

NG

OK

OK

OK

LHD:
Fuse No. CB-7 (15A, Fuse
box)
RHD:
Fuse No. CB-5 (15A, Fuse
box)

Replace the rear defogger

relay

Relay malfunction

NG

Continued on the next page

Rear defogger relay function

Repair grounding point

(

B-28

) contact

Grounding point (

B-28

)

Poor grounding point contact

NG

OK

Repair open circuit or poor
connector contact between
fuse No. CB-7 (15A) (RHD:
fuse No. CB-5 (15A)) and 2

B-7

, fuse No. CB-13 (15A)

and 5 

B-7

, 1 

B-7

 and 1

L-4

, 4 

B-7

 and 4 

B-15

 or

5 

B-15

 and 

B-28

Voltage between 1 

L-4

-

ground when the starter switch
and the rear defogger switch
are at on position (should be
battery voltage present)

Open circuit or poor connector

contact

NG

OK

8-334  ELECTRICAL-BODY AND CHASSIS

Checkpoint

Trouble Cause

Countermeasure

OK

Repair open circuit or

connector contact between 1

L-7

 and 

B-28

Open circuit or poor connector

contact

NG

Continued from the previous page

Continuity between 1 

L-7

and 

B-28

Repair heat wire

Continuity between rear

defogger terminals

Broken heat wire of rear

defogger

NG

OK

ELECTRICAL-BODY AND CHASSIS  8-335

 

  REMOVAL AND INSTALLATION

REAR DEFOGGER SWITCH (Except

South Africa, Chile)

Removal

1.Instrument Panel Cluster Assembly

• Refer to Section 10 “BODY” for instrument panel cluster

assembly removal steps.

2.Rear Defogger Switch

• Disconnect the switch connector.
• To remove the switch, push the lock from the back side

of the cluster assembly.

Installation

Follow the removal procedure in the reverse order to install the
rear defogger switch.

8-336  ELECTRICAL-BODY AND CHASSIS

  INSPECTION AND REPAIR

Switch side

REAR DEFOGGER SWITCH

Rear Defogger Switch Connections

Terminal No.

SW position

3

5

4

6

2

ON

OFF

REAR DEFOGGER RELAY

Check continuity between the relay terminals.

1

- 

5

........................ No continuity

(When battery voltage is applied between 

2

 and 

4

)

1

- 

5

........................ Continuity

INSPECTION OF REAR DEFOGGER HEAT

WIRE

• Heat wires are printed on the inner side of glass.

To  clean,  use  a  soft  cloth  and  wipe  horizontally  along  the

wires.

• Never use glass cleaner or equivalent.
• When measuring voltage, wind a piece of tin foil around the

tip of the negative probe and press the foil against the wire

with your finger as shown.

(1) Turn the ignition switch on.

(2) Turn the defogger switch on.

(3) Measure  the  voltage  between  the  three  points  on  the  heat

wire and the (-) terminal with a voltmeter.

(4) Check that the voltage becomes smaller from 

A

 to 

B

 to 

C

.