Opel Frontera UE. Manual - part 1252

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–129

Chart A: Fan Does Not Rotate At All

Condition

Possible cause

Correction

The fan does not rotate at all

—

Refer to Chart A

The fan does not rotate in the MAX–
HI mode

—

Refer to Chart B

The fan does not rotate in any mode
other than MAX–HI

—

Refer to Chart C

The fan does not stop

—

Refer to Chart D

Step

Action

Value(s)

Yes

No

1 

Is the fuse No.F–4 and No.F–5 normal?

—

Go to Step 2

Replace the 

fuse

2 

Is the relay No.X–1 and No.C–67 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.C70–2 and ground?

—

Go to Step 5

Go to Step 4

4 

Repair an open circuit between terminal No.C70–2
and No.F–4 fuse.
Is the action complete?

—

Go to Step 3

—

5 

Is there continuity between the harness side
connector terminal No.C70–1 and ground (No.C–36)?

—

Go to Step 7

Go to Step 6

6 

Repair an open circuit between terminal No.C70–1
and ground.
Is the action complete?

—

7 

Is the battery voltage applied between the harness
side connector terminal No.C70–1 and No.C70–2?

—

Go to Step 9

Go to Step 8

8 

Replace the blower motor.
Is the action complete?

—

Verify repair

—

9 

Refer to chart B and C.
Is the action complete?

—

Verify repair

—

SECTION

1A–130

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–67) 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.C70–1 and No.C67–2?

—

Go to Step 4

Go to Step 3

3 

Repair an open circuit between terminal No.C70–1
and No.C67–2.
Is the action complete?

—

Go to Step 2

—

4 

Is there continuity between the harness side
connector terminal No.C67–4 and ground (No.C–36)?

—

Go to Step 6

Go to Step 5

5 

Repair an open circuit between terminal No.C67–4
and ground (No.C–36).
Is the action complete?

—

Go to Step 4

—

6 

Is the battery voltage applied between the harness
side connector terminal No.C67–1 and ground?

—

Go to Step 8

Go to Step 7

7 

Repair an open circuit between terminal No.C67–1
and No.F–5 fuse.
Is the action complete?

—

Go to Step 6

—

8 

Is the battery voltage applied between the harness
side connector terminal No.I20–12 and ground?

—

Go to Step 10

Go to Step 9

9 

Repair an open circuit between terminal No.C67–3
and No.I20–12.
Is the action complete?

—

Go to Step 8

—

10 

Replace the auto air conditioner control unit.
Is the action complete?

—

Verify repair

—

SECTION

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–131

Chart C: Fan Does Not Rotate In Any Mode Other Than MAX HI

Chart D: Fan Does Not Stop

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.C70–1 and No.C66–1,
No.C70–1 and No.I44–17?

—

Go to Step 4

Go to Step 3

3 

Repair an open circuit between terminal.
No.C70–1 and C66–1
No.C70–1 and I44–17
  

—

Go to Step 2

—

4 

Is there continuity between the harness side
connector terminal No.C66–3 and ground (No.C–36)?

—

Go to Step 6

Go to Step 5

5 

Repair an open circuit between terminal No.C66–3
and ground.
Is the action complete?

—

Go to Step 4

—

6 

Is there continuity between the harness side
connector terminal No.C66–2 and No.I44–19?

—

Go to Step 8

Go to Step 7

7 

Repair an open circuit between terminal No.C66–2
and No.I44–19.
Is the action complete?

—

Go to Step 6

—

8 

Replace the auto air conditioner control unit.
Is the action complete?

—

Verify repair

—

Step

Action

Value(s)

Yes

No

1 

1. Disconnect the max high relay, the power

transistor connector C–66 and the auto A/C
control unit connector I–44.

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.C70–1
and No.C67–2, No.C70–1 and No.C66–1, or No.C70–
1 and I44–17.
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.C67–3
and No.I20–12.
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

—

SECTION

1A–132

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Inspection of the Heater Control System

D08R100214

SECTION