2007 ISUZU KB P190 Electrical

8A-482 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM C24SE (RHD)


RTW 780XF014401

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ELECTRICAL-BODY AND CHASSIS 8A-483

CIRCUIT DIAGRAM HFV6


RTW 78AXF016801

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8A-484 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM 4JA1T(L), 4JJ1-TC / 4JK1-TC, 4JH1-TC



RTW 78AXF006201

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ELECTRICAL-BODY AND CHASSIS 8A-485

CIRCUIT DIAGRAM C24SE (LHD)


RTW 780XF014501

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8A-486 ELECTRICAL-BODY AND CHASSIS
TROUBLE SHOOTING
Rear defogger inoperative
Checkpoint Trouble Cause Countermeasure


Reinstall or replace the fuse
No. C7 (10A) and 9
B56


Poor fuse contact or blown

NG


Reinstall or replace the fuse
C18 (20A)

C18 (20A, Fuse box)

Poor fuse contact or blown


Replace the rear defogger
switch

Rear defogger switch function

Switch malfunction

NG
NG
OK
OK
OK

Fuse No. C3 (10A, Fuse box)
and 9
B56


Replace the rear defogger
relay

Relay malfunction

NG
Continued on the next page

Rear defogger relay function


Repair grounding point contact

Grounding point
C2

Poor grounding point contact

NG
OK
Repair open circuit or poor
connector contact between
fuse No. C3 (10A) and 3

B7 , C18 (20A) and 1

B7 , 2 B7 (3 B55) and
1
L4 , 4 B7 (3 B54)
and 3
B46 or 1 B46 and

C2
Voltage between 1 L4 -
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



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ELECTRICAL-BODY AND CHASSIS 8A-487
Checkpoint Trouble Cause Countermeasure


OK
Repair open circuit or
connector contact between 1

L7 and C2


Open circuit or poor connector
contact

NG
Continued from the previous page
Continuity between 1
L7
and
C2


Repair heat wire

Continuity between rear
defogger terminals

Broken heat wire of rear
defogger

NG
OK



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8A-488 ELECTRICAL-BODY AND CHASSIS
REMOVAL AND INSTALLATION









1
RTW 77ASH000201


REAR DEFOGGER SWITCH
Removal
1. Instrument Panel Cluster Assembly
• Refer to Section 10 “BODY” for center cluster panel
assembly removal steps.
2. Rear Defogger Switch (W ith HVAC control unit) (1) Refer to Section 1 “HVAC” HVAC control unit assembl
y
removal steps.



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



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ELECTRICAL-BODY AND CHASSIS 8A-489
INSPECTION AND REPAIR





Switch side
B57


REAR DEFOGGER SWITCH
Rear Defogger Switch Connections
Terminal No.
SW position 9 7 8
ON
OFF







B7
RTW 78ASH002901

REAR DEFOGGER RELAY
Check continuity between the relay terminals.
2- 1........................ No continuity
(W hen battery voltage is applied between 4 and 3)
2- 1........................ 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.
• W hen 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.



(5) If there is a place where the voltage suddenly changes to
0V, there is a broken wire between there and the powe
r
side.
(6) Move the tester probe from the position where the voltage changes to 0V toward the power side and find where the
voltage suddenly increases.


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