relay ISUZU TF SERIES 2004 Owner's Guide

8A-166 ELECTRICAL-BODY AND CHASSIS
TROUBLESHOOTING
STOPLIGHT AND HIGH MOUNTED STOPLIGHT
1. One side of stoplight does not light

Checkpoint Trouble Cause Countermeasure


Replace the bulb or repair
connector contact

Burned out bulb or poor
connector contact
NG

Repair open circuit or
connector contact


Repair open circuit or
connector contact


Open circuit or poor connector
contact


Continuity between
9
H-9 - 2 F-6 (LH) (or
2
F-5 (RH))


Open circuit or poor connector
contact

Continuity between

C-109 - 4 F-6 (LH) (or
4
F-5 (RH)) NG NG OK
OK

Stoplight bulb continuity




2. Both sides of stoplight do not light



Adjust the switch installation
position

Stop light switch (or brake
switch) function

Incorrect the switch installation
or adjustment
NG

Repair open circuit or
connector contact
Voltage between 2 F-6
ground or 2
F-5 - ground
with brake pedal depressed
(Should be battery voltage
present)
Open circuit or poor connector
contact between stoplight
switch (or brake switch) and
stoplight NG OK

Reinstall or replace fuse No.
SBF-9 (50A)
or 1
C-108 - 4
C-107
Fuse No. C-18 (15A)


Fuse No. SBF-9 (50A, Fuse
and Relay box)
or 1
C-108 - 4
C-107
Fuse No. C-18 (15A)


Poor fuse contact or blown
NG
OK

ELECTRICAL-BODY AND CHASSIS 8A-169
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
3
C-25 - 6 B-60 (FRT),
1
C-35 - 6 B-60 (SIDE)
1
F-6 - 6 B-60 (RR)
(RH)
Continuity between
3
C-18 - 7 B-60 (FRT),
1
C-1 - 7 B-60 (SIDE)
1
F-5 - 7 B-60 (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 5 B-16 -
ground (Should be battery
voltage present)

Hazard SW. continuity


Reinstall or replace the fuse
No. EB-16 (10A)

Fuse No. EB-16 (10A, 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-16 (10A) -
5
B-16 NG



4. Flashing rate too fast (One side)

Replace the bulb or repair
open circuitInspect bulbBurned out bulb NG

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-195
INSPECTION AND REPAIR




R-9 R-10
R-1 R-6



DOOR SWITCH
Door Switch Connections

Connector
SW No.
R-9 R-10
R-1 R-6
position Terminal No.
1 Body Ground
PUSHED
RELEASED





WARNING BUZZER
1. Warning Buzzer Circuit


Warning function Operational conditions
Taillights left on The buzzer sounds when both the tail relay and the FRT door switch-drive
side are turned on. To stop the sound of the buzzer, turn on the starter
switch.




Harness side
B-45


2. Warning Buzzer Harness Side Connector Circuit
Disconnect the warning buzzer connector and check
continuity and voltage between the warning buzzer harness
side connector terminals.

Terminal
NO. Wire
color Connecting to Check itemConnecting
terminal Check condition Standard
3 G/R Tail relay 3-Ground Lighting SW “ON” Approx. 12V
6 Y Fuse CB-5 Voltage
6-Ground Starter SW “ON” Approx. 12V

Door SW Open Continuity
(FRT-LH)
Continuity Close No continuity
2 B Ground 2-Ground - Continuity
FRT door-LH 1-Ground 1
B/W

8A-198 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM WITHOUT INTERMITTENT RELAY (RHD)




RTW48AXF027901

ELECTRICAL-BODY AND CHASSIS 8A-199

CIRCUIT DIAGRAM WITH INTERMITTENT RELAY (RHD)




RTW48AXF028001

8A-200 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM WITHOUT INTERMITTENT RELAY (LHD)




RTW48AXF004501

ELECTRICAL-BODY AND CHASSIS 8A-201

CIRCUIT DIAGRAM WITH INTERMITTENT RELAY (LHD)




RTW48AXF004401

ELECTRICAL-BODY AND CHASSIS 8A-203
2. Wiper dose not operate at “ INT “ position

Checkpoint Trouble Cause Countermeasure


Replace the wiper & washer
SW.

SW. malfunction
NG

Repair grounding point contact

Grounding point
C-36



Poor grounding point contact


Repair open circuit or
connector contact

Voltage between the
intermittent relay harness side
connector terminal 4
C-3
and the ground at the “INT”
position (Should be battery
voltage present)

Open circuit or poor connector
contact
NG NG OK
OK
Continuity between the wiper
& washer SW connector
terminals 4
B-59 and 2 B-59
at the “ INT “ position

Replace the intermittent relay

Intermittent relay function

Relay malfunction
NG OK



3. Wiper does not operate at “LO” position



Replace the wiper motor

Wiper motor function
1. Disconnect the wiper &
washer SW. connector
2. Turn the starter SW. on
3. Short-circuit between the
wiper & washer SW.
harness side connector
terminals.
4.
B-59 and 5 B-59
5. Check to see if the wiper
motor rotates at a low
speed

Wiper motor malfunction
NG

Replace the wiper & washer
SW.

Wiper & washer SW. function

SW. malfunction
NG OK

ELECTRICAL-BODY AND CHASSIS 8A-205
6. Auto-stop function of the wiper motor does not operate

Checkpoint Trouble Cause Countermeasure


Repair open circuit or
connector contact

Open circuit or poor connector
contact
NG

Repair open circuit or
connector contact

Open circuit or poor connector
contact
NG Continuity between the
intermittent relay harness side
connector 6
C-3 and the
wiper motor harness side
connector 6
C-4

Replace the intermittent relay

Relay malfunction
NG
Intermittent relay function

Wiper motor function
1. Disconnect the wiper motor
connector
2. Connect the motor
connector 5
B-59 to the
battery (+) terminal and 1
C-4 to the (-) terminal,
and then change the
connection of the battery (+)
terminal to the connector 4
C-4 while the motor
rotating at a low speed
3. Check to see if the wiper
motor stops at the auto stop
position when connecting
the connector terminals 3
C-4 and 1 C-4 in this
condition
Continuity between the wiper
& washer SW. connector
terminals 5
B-59 and 6 B-59
at the “OFF” position
OK

Replace the wiper motor

Wiper motor malfunction
NG
Repair an open circuit or a
poor connection of the
connectors between the fuse
No. RHD: C-9 (20A) and 4

C-4
Voltage between the wiper
motor harness side connector
terminal 4
C-4 and the
ground (Should be battery
voltage present)

Open circuit or poor connector
contact
NG
OK OK
OK