2004 ISUZU TF SERIES fuse box

ELECTRICAL-BODY AND CHASSIS 8A-171
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-15 (10A)

Fuse No EB-15 (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
3
X-3 - ground or 1 X-3
- ground (Should be battery
voltage present) OK

Repair open circuit or
reconnect the connector
Open circuit or poor connector
contact between fuse No. EB-
15 (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-3 - 10 B-60
2
X-3 - 1 C-20 (1 C-21) OK

Repair open circuit or
connector contact

Open circuit or poor connector
contact
NG

ELECTRICAL-BODY AND CHASSIS 8A-303
1. All the doors do not lock and unlock

Checkpoint Trouble Cause Countermeasure


Reinstall or replace the fuse
No. C-14 (20A)

Poor fuse contact or blown
NG

Repair grounding point
C-2
contact

Grounding point
C-2


Poor grounding point contact


Repair open circuit or
connector contact
Voltage between the driver’s
side power window & door
lock SW harness side
connector terminal 1
D-5
and the ground (Should be
battery voltage present)

Open circuit or poor connector
contact
NG NG OK
OK OK

Fuse No. C-14 (20A, Fuse
box)


Repair open circuit or
connector contact

Open circuit or poor connector
contact
NG
Replace the driver’s side
power window & door lock
SW.
Driver’s side power window &
door lock SW. function

SW. malfunction
NG OK

Continuity between 4
D-4
and
C-2




2. All the doors do not get locked (or unlocked)


Repair open circuit or
connector contact

Open circuit or poor connector
contact
NG
Replace the driver’s side
power window & door lock
SW.
Driver’s side power window &
door lock SW. function

SW. malfunction
NG OK
Continuity between the driver’s
side power window & door
lock SW harness side
connector terminals 14
D-20
and 6
D-20

ELECTRICAL-BODY AND CHASSIS 8A-317
DIESEL W/SRS MODEL
1. All windows do not operate

Checkpoint Trouble Cause Countermeasure


Reinstall or replace the fuse
SBF-11 (30A)

Poor fuse contact or blown
NG

Replace the circuit breaker
SBF-9 (50A)

SBF-9 (50A, Fuse box)
function

Circuit breaker malfunction


Repair grounding points
C-2
contact


Grounding points
C-2


Poor grounding point contact
NG NG OK
OK OK

Fuse SBF-11 (30A, Fuse box)


Replace the power window
relay

Power window relay
malfunction
NG
Repair an open circuit or a
poor connection of the
connectors between 1
C-108
and 2
B-8
Voltage between the power
window relay harness side
connector terminal 2
B-8
and the ground (Should be
battery voltage present)

Open circuit or poor connector
contact
NG OK

Power window relay function

OK
Repair an open circuit or a
poor connection of the
connectors between 1
B-8
and 1
B-56 and 6 D-5

Open circuit or poor connector
contact
NG Voltage between 6 D-5 and
the ground (Should be battery
voltage present)

OK
Repair an open circuit or a
poor connection of the
connectors between 3
D-5
and
C-2 , or 3 B-8 (12

C-107 )
and C-2

Open circuit or poor connector
contact
NG
Continued on the next page

Voltage between
C-2 and
the ground

ELECTRICAL-BODY AND CHASSIS 8A-335
TROUBLESHOOTING
CIGARETTE LIGHTER
1. Lighter does not pop out after being pushed in. It does not become hot.

Checkpoint Trouble Cause Countermeasure


Reinstall or replace the fuse
No. C-12 (15A)

Poor Fuse No. C-12 (15A,
Fuse box) contact or blown
NG

Replace the lighter

Lighter continuity between
center part and outer area

Open circuit or poor connector
contact


Repair open circuit or
connector contact
Voltage between connector 1
B-21 and the ground at
starter SW. is ACC position
(Should be battery voltage
present)

Open circuit or poor connector
contact
NG NG OK
OK OK

Audio system (System should
receive power)


Repair open circuit or
connector contact

Open circuit or poor connector
contact
NG
Continuity between connector
1
B-22 and the ground




2. Lighter pops out prematurely before becoming hot

Repair or replace the lighter
and/or casingDeformed lighter or casing NGLighter and casing



3. Lighter becomes too hot

Repair or replace the lighter
and/or casingDeformed lighter and casing NGLighter and casing

8A-342 ELECTRICAL-BODY AND CHASSIS
DOOR MIRROR CONTROL SWITCH
1. Mirrors on the both sides do not operate

Checkpoint Trouble Cause Countermeasure


Reinstall or replace the fuse
No. C-11 (10A)

Poor fuse contact or blown
NG

Repair grounding point
C-2
contact

Grounding point
C-2


Poor grounding point contact

Repair an open circuit or a
poor connection of the
connectors between the fuse
No. C-11 (10A) and 4
D-19
Voltage between the door
mirror control SW. harness
side connector terminal
4
D-19 and the ground
(Should be battery voltage
present)

Open circuit or poor connector
contact
NG NG OK
OK OK

Fuse No. C-11 (10A, Fuse
box)


Repair open circuit or
connector contact

Open circuit or poor connector
contact
NG Continuity between the door
mirror control SW harness
side connector terminal
8
D-19 and C-2

Replace the door mirror
control SW.

Door mirror control SW.
function

SW. malfunction
NG OK

Repair open circuit or
connector contact

Continuity between 7
D-19
and 2
H-24 (or 2 H-25 )


Open circuit or poor connector
contact
NG OK

ELECTRICAL-BODY AND CHASSIS 8A-353
TROUBLE SHOOTING
Rear defogger inoperative

Checkpoint Trouble Cause Countermeasure


Reinstall or replace the fuse
No. C-7 (15A) and 9
B-56


Poor fuse contact or blown
NG

Reinstall or replace the fuse
SBF-10 (20A)

SBF-10 (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. C-7 (15A, Fuse box)
and 9
B-56


Replace the rear defogger
relay

Relay malfunction
NG
Continued on the next page

Rear defogger relay function


Repair grounding point
D-2
contact

Grounding point
C-2


Poor grounding point contact
NG OK
Repair open circuit or poor
connector contact between
fuse No. C-7 (15A) and 3
B-7, SBF-10 (20A) and 1
B-7, 2 B-7 (3 B-55) and
1
L-4, 4 B-7 (3 B-54)
and 3
B-46 or 1 B-46 and

C-2
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

ELECTRICAL-BODY AND CHASSIS 8A-437


No. Connector face No. Connector face
P-1
Silver
Battery (+) P-9

SilverACG (B)
P-2
Silver
Relay & Fuse box P-10
SilverEngine ground
P-3

Brown
Starter (S) P-11
SilverFuse & relay box
P-4
Silver
Starter (B) P-12
NOT USED
P-4
Silver
Starter (B) P-13

Gray Shift on the fly actuator
P-5
Silver
Battery (-) P-14
WhiteFuse & relay box
P-6
Silver
Body earth (Ground) P-15
Silver2nd battery (+)
P-7
NOT USED P-16
Silver
2nd battey (-)
P-8
(C24SE)
(4JH1-TC
Green ACG (L)


P-8
(6VE1)
White ACG (L)

ENGINE ELECTRICAL 6D – 33
PRE-HEATING SYSTEM
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacement if excessive wear of damage is discovered during
inspection.

VISUAL CHECK
Check the main fuses and glow indicator for damage.
Replace the part(s) if required.
GLOW RELAY
The glow relay is located in the relay box the engine
compartment.



825R300046




Use an ohmmeter to measure the resistance between
terminals No.2 and No.3.
If the measured value is outside the specified range, the
glow relay must be replaced.
Glow Relay Resistance Ohms
94  114

GLOW PLUG


LNW21KSH001401
Use a circuit tester to test the glow plugs for continuity.
Glow Plug Resistance (Reference) Ohms
Approximately 0.9

EGR SYSTEM 4JA1T (L)
Refer to 6F-9. (EGR system diagram)