Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 35
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–111
Condition
Possible cause
Correction
The fan dose not rotate at all
—
Refer to
Chart A
The fan dose not rotate in the
MAX–HI mode
—
Refer to
Chart B
The fan dose not rotate in any mode
other than MAX–HI
—
Refer to
Chart C
The fan dose not stop
—
Refer to
Chart D
Chart A: Fan Does Not Rotate At All
Step
Action
Value(s)
Yes
No
1
Are the fuse No.F–5, F–6 and No.F–7 normal?
—
Go to
Step 2
Replace the
fuse
2
Are the relay No.X–1 and No.C–35 normal?
—
Go to
Step 3
Replace the
relay
3
Turn on the ignition switch (the engine is run).
Is the battery voltage applied between the harness side
connector terminal No.C36–1 and ground?
—
Go to
Step 5
Go to
Step 4
4
Repair an open circuit between terminal No.C36–1 and
No.F–5 and F–6 fuse.
Is the action complete?
—
Go to
Step 3
—
5
Is there continuity between the harness side connector
terminal No.C36–2 and ground (No.C–10)?
—
Go to
Step 7
Go to
Step 6
6
Repair an open circuit between terminal No.C36–2 and
ground.
Is the action complete?
—
—
—
7
Is the battery voltage applied between the harness side
connector terminal No.C36–2 and No.C36–1?
—
Go to
Step 8
Go to
Step 9
8
Replace the blower motor.
Is the action complete?
—
Verify repair
—
9
Refer to
chart B and C.
Is the action complete?
—
Verify repair
—
1A–112 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart B: Fan Does Not Rotate in MAX HI Mode
Step
Action
Value(s)
Yes
No
1
Is the MAX-HI relay (C–35) normal?
—
Go to
Step 2
Replace the
relay
2
1. Turn on the ignition switch (the engine is run).
2. Set the fan switch to the MAX-HI.
Is there continuity between the harness side connector
terminal No.C36–2 and No.C35–5?
—
Go to
Step 4
Go to
Step 3
3
Repair an open circuit between terminal No.C36–2 and
No.C35–5.
Is the action complete?
—
Go to
Step 3
—
4
Is there continuity between the harness side connector
terminal No.C35–1 and ground (No.C–10)?
—
Go to
Step 6
Go to
Step 5
5
Repair an open circuit between terminal No.C35–1 and
ground (No.C–10).
Is the action complete?
—
Go to
Step 4
—
6
Is the battery voltage applied between the harness side
connector terminal No.C35–2 and ground?
—
Go to
Step 8
Go to
Step 7
7
Repair an open circuit between terminal No.C35–2 and
No.F–7 fuse.
Is the action complete?
—
Go to
Step 6
—
8
Is the battery voltage applied between the harness side
connector terminal No.I19–2 and ground?
—
Go to
Step 10
Go to
Step 9
9
Repair an open circuit between terminal No.C35–4 and
No.I19–2.
Is the action complete?
—
Verify repair
—
10
Replace the auto air conditioner control unit.
Is the action complete?
—
Verify repair
—
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–113
Chart C: Fan Does Not Rotate In Any Mode Other Than MAX HI
Step
Action
Value(s)
Yes
No
1
Is the power transistor performance normal? (Refer to
the
later section on “individual inspection”)
—
Go to
Step 2
Replace the
power
transistor
2
Is there continuity between the harness side connector
terminal No.C36–2 and No.C34–1, No.C36–2 and
No.I20–17?
—
Go to
Step 4
Go to
Step 3
3
Repair an open circuit between terminal.
No.C36–2 and C34–1
No.C36–2 and I20–17
—
Go to
Step 2
—
4
Is there continuity between the harness side connector
terminal No.C34–3 and ground (No.C–10)?
—
Go to
Step 6
Go to
Step 5
5
Repair an open circuit between terminal No.C34–3 and
ground.
Is the action complete?
—
Go to
Step 4
—
6
Is there continuity between the harness side connector
terminal No.C34–2 and No.I20–19?
—
Go to
Step 8
Go to
Step 7
7
Repair an open circuit between terminal No.C34–2 and
No.I20–19.
Is the action complete?
—
Go to
Step 6
—
8
Replace the auto air conditioner control unit.
Is the action complete?
—
Verify repair
—
1A–114 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart D: Fan Does Not Stop
Step
Action
Value(s)
Yes
No
1
1. Disconnect the max high relay, the power transistor
connector C–34 and the auto A/C control unit
connector I–20.
2. Turn on the ignition switch.
Does the blower motor stop?
—
Go to
Step 3
Go to
Step 2
2
Repair a short circuit between connector No.C36–2
and No.C35–5, No.C36–2 and No.C34–1, or
No.C36–2 and I20–17.
Is the action complete?
—
Verify repair
—
3
Is the max high relay normal? (Refer to the
later section
on “individual inspection”.)
—
Go to
Step 4
Replace the
relay
4
Reinstall the max high relay.
Does the blower motor start operating?
—
Go to
Step 6
Go to
Step 5
5
Repair a short circuit between connector No.C35–4
and No.I19–2.
Is the action complete?
—
Go to
Step 4
—
6
Is the power transistor normal? (Refer to the
later
section on “individual inspection”.)
—
Go to
Step 7
Replace the
power
transistor
7
Reinstall the power transistor.
Does the blower motor start operating?
—
Replace the
auto A/C
control unit
—
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