Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 29
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–87
Auto Air Conditioner Control Unit Power Supply Diagnosis
This check is required because a trouble on the auto
amplifier (control unit) power supply circuit or grounding
circuit prevents accurate troubleshooting.
D08R200034
Condition
Possible cause
Correction
Power source does not supply to
auto air conditioner control unit.
—
Refer to
Chart A
1A–88 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart “A”: Check of Auto Amplifier Power Supply System
Step
Action
Value(s)
Yes
No
1
Is the fuse C–5 normal?
—
Go to
Step 2
Replace the
fuse
2
Is the fuse F–7 normal?
—
Go to
Step 3
Replace the
fuse
3
Disconnect the auto A/C control unit connector I–19.
Is the battery voltage applied between the harness side
connector terminal No.I32–8 and the ground?
Approx. 12V
Go to
Step 5
Go to
Step 4
4
Repair an open circuit between the fuse C–5 and
terminal No.I19–8.
Is the action complete?
—
Go to
Step 4
—
5
Is there continuity between the harness side connector
terminal No.I19–16 and the ground?
—
Go to
Step 7
Go to
Step 6
6
Repair an open circuit between terminal No.I19–16 and
the ground No.B–9.
Is the action complete?
—
Go to
Step 5
—
7
Turn the lighting switch on.
Is the battery voltage applied between the harness side
connector terminal No.I19–12 and the ground?
Approx. 12V
Go to
Step 9
Go to
Step 8
8
Repair an open circuit between the lighting switch and
terminal No.I19–12.
Is the action complete?
—
Go to
Step 7
—
9
Turn the starter switch on.
Is the battery voltage applied between the harness side
connector terminal No.I19–7 and the ground?
Approx. 12V
—
Go to
Step 10
10
Repair an open circuit between the fuse F–7 and
terminal No.I19–7.
Is the action complete?
—
Verify repair
—
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–89
Performance and Movement
checklist for Automatic Air
Conditioner Related Parts
Start the engine, and when the engine coolant reached
50
°
C (122
°
F) check performance and movement of the
related parts according the following checklist.
Performance Check Using the Manual Switch
No
Item
Procedure
Criteria
No.
Item
Condition
Operation
Criteria
1
Air discharge
temperature
(Ai
i d
Auto–switch ON
Set temperature to
18
°
C (65
°
F).
Cold air discharge.
1
(Air–mix door
operation)
Set temperature to
32
°
C (90
°
F).
Hot air discharge.
2
Air discharge
volume (Fan
operation)
Fan switch ON
1. Set temperature to
25
°
C (77
°
F).
2. Press the OFF
switch.
Fan does not operate. There is no
air discharge.
2
1. Set temperature to
25
°
C (77
°
F).
2. Press the fan
switch.
Fan operates. Fan speed increases
each time the switch is pressed (LO
to HI in 5 increments).
3
Air discharge
temperature
(Mode door
operation)
Fan in manual
5–speed operation
1. Set temperature to
25
°
C (77
°
F).
2. Press the mode
switch.
3. Move through the 5
modes
(VENT
→
BI–LEVEL
→
FOOT
→
DEF/FO
OT
→
DEF).
D
Panel display lights for each
mode.
D
Air discharge outlet position
changes for each mode.
4
Inside/outside air
mode (Intake door
operation)
Auto–switch ON
1. Set temperature to
25
°
C (77
°
F).
2. Press the intake
switch.
3. Press the fan
switch.
4. Set the fan to the
highest speed.
5. Press the intake
switch.
D
Intake switch LED turns from on
to off.
D
Air discharge sound changes.
5
Compressor
Outside air
temperature above
0
°
C (32
°
F) and
vehicle interior at
normal temperature
1. Set temperature to
25
°
C (77
°
F).
2. Press the OFF
switch.
3. Press the
auto–switch.
4. Press the air
conditioner switch.
D
When the auto–switch is
pressed, the LED in the air
conditioner switch turns on and
the compressor begins
operation.
D
When the air conditioner switch
is pressed, the LED in the air
conditioner switch turns off and
the compressor stops operation.
1A–90 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Check of Auto Function
No
Item
Procedure
Criteria
No.
Item
Condition
Operation
Criteria
AUTO display highlighted on
display panel.
Cold air discharge.
Set temperature to
18
°
C (65
°
F)
VENT mode.
18 C (65 F).
Intake switch LED on.
Fan speed bar graph display at
MAX6dash;HI
A/C switch LED on.
1
Automatic operation
Auto-switch ON
Gradually increase
the temperature
setting from 18
°
C
(65
°
F) to 31.5
°
C
(89
°
F).
Temperature of air discharge
increases with increase in setting
temperature.
Air discharge volume changes.
Panel display shows VENT,
BI–LEVEL, FOOT, or DEF/FOOT.
Hot air discharge.
A/C bar graph display disappears.
Set temperature to
32
°
C (90
°
F)
Foot mode.
32
°
C (90
°
F).
Intake LED switch off.
Fan speed bar graph display at
MAX-HI
A/C switch LED on.
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