Isuzu Trooper (2000 year). Manual — part 39
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–125
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.C–19 and No.C–20 normal?
—
Go to Step 2
Replace the
fuse
2
Are the relay No.B–36 and No.I–51 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.B5–1 and ground?
—
Go to Step 5
Go to Step 4
4
Repair an open circuit between terminal No.B5–1 and
No.C–19 fuse.
Is the action complete?
—
Go to Step 3
—
5
Is there continuity between the harness side connector
terminal No.B5–2 and ground (No.B–2)?
—
Go to Step 7
Go to Step 6
6
Repair an open circuit between terminal No.B5–2 and
ground.
Is the action complete?
—
—
—
7
Is the battery voltage applied between the harness side
connector terminal No.B5–2 and No.B5–1?
—
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–126 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 (I–51) 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.B5–2 and No.I51–2?
—
Go to Step 4
Go to Step 3
3
Repair an open circuit between terminal No.B5–2 and
No.I51–2.
Is the action complete?
—
Go to Step 3
—
4
Is there continuity between the harness side connector
terminal No.I51–4 and ground (No.B–2)?
—
Go to Step 6
Go to Step 5
5
Repair an open circuit between terminal No.I51–4 and
ground (No.B–2).
Is the action complete?
—
Go to Step 4
—
6
Is the battery voltage applied between the harness side
connector terminal No.I51–1 and ground?
—
Go to Step 8
Go to Step 7
7
Repair an open circuit between terminal No.I51–1 and
No.C–20 fuse.
Is the action complete?
—
Go to Step 6
—
8
Is the battery voltage applied between the harness side
connector terminal No.I32–12 and ground?
—
Go to Step 10
Go to Step 9
9
Repair an open circuit between terminal No.I51–3 and
No.I32–12.
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–127
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.B5–2 and No.I50–1, No.B5–2 and
No.I33–17?
—
Go to Step 4
Go to Step 3
3
Repair an open circuit between terminal.
No.B5–2 and I50–1
No.B5–2 and I33–17
—
Go to Step 2
—
4
Is there continuity between the harness side connector
terminal No.I50–3 and ground (No.B–2)?
—
Go to Step 6
Go to Step 5
5
Repair an open circuit between terminal No.I50–3 and
ground.
Is the action complete?
—
Go to Step 4
—
6
Is there continuity between the harness side connector
terminal No.I50–2 and No.I33–19?
—
Go to Step 8
Go to Step 7
7
Repair an open circuit between terminal No.I50–2 and
No.I33–19.
Is the action complete?
—
Go to Step 6
—
8
Replace the auto air conditioner control unit.
Is the action complete?
—
Verify repair
—
1A–128 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 I–50 and the auto A/C control unit
connector I–33.
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.B5–2 and
No.I51–2, No.B5–2 and No.I50–1, or No.B5–2 and
I33–17.
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.I51–3 and
No.I32–12.
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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