Isuzu Axiom: Electrical System Instruction - page 28

REAR DEFOGGER
Circuit Operation
Voltage is applied at all times through the EB-19 IGN.
B2 fuse
to the rear defogger relay coil. With the starter
switch in ON, voltage is applied through the C-16 RR
WIPER fuse to the rear defogger relay contacts.
When you push the rear defogger switch to the ON
position, battery voltage is applied from the C-8
(MIRROR DEFOG.) fuse to the left and right power
mirror defoggers. The power mirror defogger heats up
to remove any fog from the mirrors.
When the rear window defogger switch is depressed,
the PCM receives an input from the switch and, in turn,
the PCM provides ground to the coils of the rear window
defogger relay. The contacts close, applying ignition
voltage to the rear window defogger, rear window
defogger indicator light (through the C-9 and C-10
REAR DEFOG. fuses), and the left and right power
mirror defoggers (through the C-8 MIRROR DEFOG.
fuse). The PCM acts as the timer for the rear window
defogger relay and keeps the contacts closed,
maintaining the operation of the rear window defogger,
left and right mirror defoggers and indicator light for 10
minutes or until the ignition is turned to “ACC” or “OFF”,
or the rear window defogger switch is depressed again.
The rear window and mirrors heat to remove any fog
from the glass and the indicator stays on to remind the
driver that it is in use.
Component Location Index
(Refer to Section 201 for photographs.)
Component
Photo No.
Audio and Switch Assembly
Center of I/P
. . . .
Dash Fuse Box
Behind left I/P side trim panel
42
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse/Relay Box
Right side of engine compartment
8
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powertrain Control Module
(PCM)
Left side of engine compartment
26
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Defogger Relay
In the dash fuse box
43
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connector
G-2 (1-BLK)
Upper left side of tailgate door
89
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-8 (1-BLK)
Upper right side of tailgate door
89
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-4 (52-GRY)
Left side of engine compartment
31
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-10 (22-BLK)
Behind left kick panel
46
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-16 (16-WHT)
Behind left kick panel
46
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-29 (6-BLK)
Left rear side of roof
91
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-31 (6-BLK)
Upper left side of tailgate (panel removed)
89
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground
B-9
Under center console
71
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
61Ć1
AUTOMATIC A/C
Component Index
A/C Compressor
A/C Compressor Relay
A/C Thermo Relay
A/C Triple Pressure Switch
Audio and Switch Assembly
Auto A/C Control Unit
Blower Motor
Condenser Fan
Condenser Fan Relay
Dash Fuse Box
Evaporator Sensor
Fuse/Relay Box
Heater-A/C Relay
In Car-Temperature Sensor
Intake Actuator
Junction Connector A
Max Hi Relay
MID Display
Mix Actuator
Mode Actuator
Option Fuse Box
Outside Temperature Sensor
Power Transistor
Powertrain Control Module (PCM)
Sunlight Sensor
Vehicle Speed Sensor
AUTOMATIC A/C (BLOWER CONTROLS)
Circuit Schematic
65
P-10/C-10
M
DASH
FUSE
BOX
EB-16
MAIN
100A
HEATER-
A/C RELAY
BLOWER
MOTOR
2
BLU/RED
EB-5
BLOWER
15A
C-36
Connector
1
C-36
Connector
2
BLU/WHT
BLK
WHT/BLU
1
X-1
X-1
5
4
FUSE/
RELAY
BOX
BLU/BLK
C-34
Connector
1
See Ground
Distribution,
page 14-3.
BLK
EB-6
BLOWER
15A
WHT/RED
HOT AT ALL TIMES
BLU/WHT
H-13
Connector
3
WHT/BLU
See Power
Distribution,
page 10.
C-15
ELEC.IG.
15A
See Dash
Fuse Box
page 11-6.
WHT/BLU
HOT IN ON
J/C A
EB-7
A/C
10A
BRN
MAX HI
RELAY
4
2
5
1
C-35
Connector
C-35
Connector
AUTO A/C
CONTROL
UNIT
Solid-state:
Do not check
resistance.
B-9
BLK
See Ground
Distribution,
page 14.
16
I-19
Connector
3
2
C-34
Connector
A
B
C
To B on
page 65-2.
To C on
page 65-4.
To A on
page 65-1.
Blower
speed
input
Blower
speed
control
HI
blower
speed
control
Ground
6
5
H-13
Connector
BLU/BLK
BLK
15
H-14
Connector
17
I-20
Connector
19
I-19
Connector
2
GRN/WHT
GRN/YEL
BLU/BLK
GRN/WHT
BLK
BLK
GRN/YEL
BLU/BLK
BLU/BLK
BRN
BRN
BRN
BRN
BRN
BLU/WHT
POWER
TRANSISTOR
BLK
BLK
AUTOMATIC A/C
(COMPRESSOR & CONDENSER FAN CONTROLS)
Circuit Schematic
65Ć1
HOT AT ALL TIMES
GRN/WHT
A/C
THERMO
RELAY
2
4
A/C
compressor
relay control
4
1
BRN/YEL
4
A/C
COM-
PRES-
SOR
RELAY
45
E-34
Connector
A/C
ON
input
POWERTRAIN
CONTROL
MODULE (PCM)
Solid-state:
Do not check
resistance.
3
GRN/RED
GRY/RED
GRY
FUSE/
RELAY
BOX
CLUTCH
C-5
ROOM
LAMP
10A
BRN/YEL
BRN
GRN/BLK
A/C
COMPRESSOR
H-4
Connector
GRY/RED
17
H-4
Connector
12
GRN/BLK
DASH
FUSE
BOX
CON-
DENSER
FAN
RELAY
AUTO A/C
CONTROL UNIT
Solid-state:
Do not check
resistance.
Battery
A/C
compressor
relay input
I-19
Connec-
tor
8
I-20
Connec-
tor
18
GRY/
RED
14
I-19
Connector
AUTO A/C
CONTROL
UNIT
Solid-state:
Do not check
resistance.
A/C
thermo
relay
control
H-13
Connector
4
GRN/RED
A/C TRIPLE
PRESSURE
SWITCH
1
2
3
C-21
Connector
C-21
Connector
HOT IN ON
EB-20
COND. FAN
30A
FUSE/
RELAY
BOX
OPTION
BOX
M
BLK
See Ground
Distribution,
pages 14-3
and 14-4.
P-10/C-10
BLK
A
From A on
page 65.
C-16
Connector
1
See Fuse
Box Details,
page 11.
RED/
WHT
RED/
WHT
H-14
Connec-
tor
16
BRN
BRN
BRN
BRN
BRN
4
BLU/ORN
5
X-16
2
4
1
X-16
BLK
BLU
C-16
Connector
2
GRY/RED
GRY/RED
BRN
BRN
CYCLING
SWITCH
C-21
Connector
C-21
Connector
DUAL
PRESSURE
SWITCH
PNK/WHT
CONDENSER
FAN
5
5
X-8
1
X-8
X-2
2
X-2
BLU/LT GRN
E-2
BLU/BLK
4
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