Opel Frontera UBS. Manual - part 926

1B–98 AIR CONDITIONING

*1. Displaying the Current Trouble Diagnosing Table

Start the engine while holding down both the Auto switch and the DEF switch on the control panel, and
the table will appear in approximately 10 seconds to the indicator lamp (LED) of the air conditioning
switch. Result of the diagnosis along the following 9 items will be shown one by one in 0.5 second
interval irrespective of presence or absence of a trouble for a given item. When the display 9 items is
completed, it is repeated with 3 seconds of interval in between. A failed item is indicated by flashing of
the LED that is repeated 3 times within 0.5 seconds. If a trouble is indicated, you can locate the failed
section by knowing when in the total sequence it has been displayed.

Items for Current Trouble Diagnosis

As shown above, display of result along nine items is repeated with 3-second interval in between.
Note 1: When checking the solar radiation sensor, apply sufficient light using a 60W bulb.

Otherwise, it can be diagnosed as failed.

Note 2: If the temperature setting lever is set on both ends (one set to 18°C, blue scale = Full cool and

the other to 31°C, red scale = Full hot), they can be diagnosed as failed.

Note 3: Likewise, the fan switch can be diagnosed as failed if set on both ends.

LED on

LED off

Indication for presence
of a trouble

Indication for normal state

0.5

0.5

0.5

3 seconds interval

ON

OFF

Display pattern

Failed part

Normal pattern

In car sensor

Ambient sensor

Sun sensor (Note 1)

Duct sensor

Temperature control lever (Note 2)

Fan switch (Note 3)

Mix actuator

Mode (blow port) control

Intake (fresh air/interior air switching) control

F01RX010

F01RY00008

AIR CONDITIONING  1B–99

*2. Displaying the Past Trouble Diagnosing Table

The past trouble diagnosis displays only the items on which trouble has recurred 16 times in the past.
If you press the air conditioning switch once while the current trouble diagnosis is taking place, display
of the past trouble diagnosis will appear on the indicator lamp (LED) of the air conditioning switch.
Results of the diagnosis along the following five items are displayed one by one in 0.5 second interval
irrespective of presence or absence of a trouble. A failed item is indicated by flashing of the LED that is
repeated 3 times within 0.5 seconds. You can locate the failed section by counting in what sequence it
has been displayed.

Items for Past Trouble Diagnosis

LED on

LED off

Indication for presence of a trouble

Indication for normal state

0.5

0.5

0.5

3 second interval

Display pattern

ON

OFF

Normal pattern

In car sensor

Ambient sensor

Sun sensor

Duct sensor

Mix actuator

Failed part

F01RX011

F01RY00007

*3. Check of Output Equipment

FAN

MIX

MODE
DOOR

INTAKE

DOOR

SET UP

TEMPERATURE

100

(%)

33.5

F/H

VENT

B/L

FOOT

D/F

DEF

REC

MIX

FRE

F/C

20

21

22

23

24

25

26

27

28

29

30

F/H

(%)

F/C

F01RY00001

1B–100 AIR CONDITIONING

Independent check of sensors

Replace the control unit.

Sensors

Allowable range

Check method

In car sensor

Ambient sensor

Sun sensor

Refer to the sensor resistance curve.

Refer to the sensor resistance curve.

100 ohms maximum in forward and 0.02 mA

minimum when exposed to 60W incandescent lamp.

Chart 1

Chart 2

Chart 3

Replace the harness and

connector.

Replace the sensors.

Check the related harness and

connector

Normal ?

Normal ?

NO

NO

YES

YES

INSPECTION BY FAILED LOCATION

Inspection of the Sensors

When the self-diagnosis function has determined that trouble is present on the sensors, check them
according to the following flow chart.

F01RY00005

AIR CONDITIONING  1B–101

Chart 1: In Car Sensor

NO

Replace the sensor.

NO

Disconnection of the harness.

Failure on the automatic heater/air

conditioner control unit.

YES

Disconnect the in car sensor connector (I-34).

YES

Is the sensor performance normal? (refer to

the later section on "Check Up")

Are conduction provided between the
following connector terminals on chassis
harness side?:
No.3 and 

No.1 .

No.4 and 

No.11 .

I-33

I-34

I-33

I-34

I-33

I-34

1

11

2

12

3

13

4

14

5

15

6

16

7

17

8

18

9

19

10

20

0.3 BR/B

0.5 B/L

11

1

In car Sensor

Auto A/C Control Unit

(In car Sensor)

(Sensor GND)

4

3

I-33

I-34

1 2

4

3

D08RY00174