Opel Frontera UBS. Manual - part 1877

AIR CONDITIONING  1B–109

Chart B: Mix Actuator Control Failure

NO

Replace the actuator.

NO

The harness is disconnected.

NO

NO

Mix actuator control failure due to the

failed sensor.

YES

YES

YES

YES

Turn on the ignition switch (the engine is

started).

Replace the automatic heater/air conditioner

control unit.

Is conduction provided between the
following chassis harness side
connector terminals?
No.3 and 

No.11 .

No.7 and 

No.5 .

No.2 and 

No.15 .

I-33

I-45

I-33

I-45

I-33

I-45

Is sum of the voltages between the
following chassis harness side connector
terminals approximately 5V?
Voltage between No.15 

and No.5

plus voltage between No.5 

and No.11 

.

I-33

I-33

I-33

I-33

Does the self-diagnosis function (the
current trouble display) indicate failure
on the mix actuator potentiometer?

Is full stroke of the air mix door available
when you selected FH or FC using the
temperature control lever?

Failure on the air mix door or the link

unit.

1B–110 AIR CONDITIONING

Inspection of the Mode Actuator System

H-26

10 11 12 13 14 15

1 2 3 4 5

17 18 19 20

6 7 8 9

16

9 8 7 6

20 19 18 17 16

5

14

15

4

13

3

12

2

11

1

10

H-25

I-32

I-33

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

1

11

2

12

3

13

4

14

5

15

6

16

7

17

8

18

9

19

10

20

I-32

0.3Y/BR

0.3Y/BR

B-69

I-33

10

9

8

7

11

6

3

（

DEF TO VENT

）

 ＋

 VENT side

 ＋

 DEF side      

MODE1

MODE2

MODE3

MODE4

MODE5

S.GND

4

1

2

3

4

20

5

26

25

11

0.5Y/G

0.3Y/G

12

0.3GR

0.3GR

0.3GR/G

18

0.5GR/R

0.5GR/R

19

0.5GR/G

0.3GR/G

5

0.3GR/L

0.3GR/L

1

0.5B/L

0.3B/L

4

Auto A/C Control Unit

M

1

5

4

3

8

7

2

6

9

VENT

FOOT

DEF

B/L

D/F

Mode Actuator

(Heater Unit)

（

VENT TO DEF

）

H-25

H-25

H-26

H-26

H-25

H-26

H-26

0.5B/L

8

H-25

B-69

1

2

5

6

3

4

8

9

7

10 9 8 7 6

5 4 3 2 1

2221201918

1514131211

17

16

1 2 3 4 5

1112131415

6 7 8 9 10

1819202122

16

17

Type of the

trouble

Control failure.

Chart B

Does not work at all.

Chart A

D08RY00180

AIR CONDITIONING  1B–111

Chart A: Does Not Work At All

NO

The harness is disconnected.

NO

Replace the automatic heater/air

conditioner control unit.

NO

Replace the automatic heater/air

conditioner control unit.

YES

YES

YES

Turn on the ignition switch (the engine is

started).

Disconnect the mode actuator connector 

(B-69).

Select VENT pushing the mode actuator

switch.

Turn on the DEF mode switch.

Failure on the actuator.

Is the battery voltage provided on a
regular interval between the following
chassis side connector terminals?
No.3 

(+) and No.4 

(-).

I-32

I-32

Is conduction provided between the
following chassis harness side connector
terminal?
No.1 and 

No.4 .

No.5 and 

No.3 .

I-32

B-69

I-32

B-69

Is the battery voltage provided on a
regular interval between the following
chassis harness side connector
terminals?
No.4 

(+) and No.3 

(-).

I-32

I-32

1B–112 AIR CONDITIONING

Chart B: Mode Actuator Control Failure

NO

The harness is disconnected.

NO

Replace the actuator.

NO

Failure on the mode door or the link unit.

YES

Mode control failure due to the failed

sensor.

NO

YES

YES

YES

Turn on the ignition switch (the engine is

started).

Replace the automatic heater/air conditioner

control unit.

Is conduction provided between the
following chassis harness side
connector terminals?
No.9 and 

No.11 .

No.3 and 

No.10 .

No.4 and 

No.8 .

I-33

B-69

I-33

B-69

I-33

B-69

Is sum of the voltages between the
following chassis harness side connector
terminals approximately 5V?
Voltage between No.15 

and No.1

plus voltage between No.15 

and No.11 

.

I-33

I-32

I-32

I-32

Does the mode work normally through
manual operation?

Is full stroke available from the mode
door when the defrost mode and vent
mode are selected?