| Test step |
DTC |
Test scope
|
Test connection
|
Test condition
|
Nominal value
|
Possible cause/Remedy
|
| 1.0 |
|
A/C pushbutton control module (N22)
Voltage supply
Circuit 30
|
19  |
N22
 |
 8 |
on right connector (2). |
11-14 V |
Wires,
Circuit 31,
 1.1 |
| 1.1 |
|
Circuit 30 |
 |
N22
|
8 |
|
11-14 V |
Wires. |
| 2.0 |
|
Voltage supply, circuit 15 |
19 |
N22
|
9 |
on right connector (2).
Ignition: ON |
11-14 V |
Wires. |
| 3.0 |
|
Voltage supply, circuit 15x |
|
N22
|
11 |
on left connector (1).
Ignition: ON |
11-14 V |
Wires. |
| 4.0 |
 
 |
In-car temperature sensor with aspirator blower (B10/4)
Resistance |
19 |
N22
 |
20 |
Ignition: OFF
on left connector (1).
Disconnect N22 from . |
oC k 
10 19.0 - 21.0
20 11.9 - 13.0
30 7.7 - 8.4
45 4.2 - 4.6
|
Wires,
B10/4. |
| 5.0 |
 |
Outside temperature
sensor (B10/5)
Resistance |
19 |
N22
|
21 |
Ignition: OFF
on left connector (1).
Disconnect N22 from . |
oC k
10 5.2 - 5.8
20 3.2 - 3.6
30 2.0 - 2.3
45 1.1 - 1.25
|
Wires,
B10/5. |
| 6.0 |
|
Evaporator temperature sensor (B10/6)
Voltage |
19 |
N22
|
22 |
on left connector (1).
Ignition: ON |
oC V
0 3.7 - 4.1
10 3.1 - 3.5
20 2.6 - 3.0
30 2.0 - 2.4
45 1.4 - 1.8
|
Wires,
6.1 ,
A/C pushbutton control
module (N22). |
| 6.1 |
|
Resistance |
19 |
N22
|
22
|
Ignition: OFF
on left connector (1).
Disconnect N22 from . |
oC k
0 7.3 - 10.0
10 4.2 - 6.0
20 2.8 - 3.9
30 1.7 - 2.6
45 1.0 - 1.5
|
Wires,
B10/6. |
| 7.0 |
|
Heater core temperature sensor (B10/1)
Resistance |
19 |
N22
|
23 |
Ignition: OFF
on left connector (1).
Disconnect N22 from . |
oC k
10 19.0 - 21.2
20 11.9 - 13.2
30 7.7 - 8.4
45 4.2 - 4.6
|
Wires,
B10/1. |
| 8.0 |
|
ECT sensor (B10/8)
Resistance |
19 |
N22
|
24 |
Ignition: OFF
on left connector (1).
Disconnect N22 from . |
oC k
20 5.0 - 8.0
60 1.0 - 1.5
85 0.46 - 0.65
100 0.3 - 0.4
120 0.19 - 0.22
|
Wires,
B10/8. |
| 9.0 |
|
Refrigerant pressure
sensor (B12)
Voltage |
19 |
N22
|
16 |
on left connector (1).
Ignition: ON |
bar V
2 0.5 - 0.75
10 1.4 - 1.8
18 2.4 - 2.8
28 3.5 - 4.0
|
Wires,
B12,
9.1 |
| 9.1 |
|
Voltage supply |
19 |
N22
|
7
|
on left connector (1).
Ignition: ON |
4.75 - 5.25 V |
Wires,
B12,
A/C pushbutton control
module (N22).
|
| 10.0 |
|
Diagnostic signal output |
|
N22
|
18
|
Ignition: ON
on left connector (1). |
11 - 14 V |
Wires,
A/C pushbutton control
module (N22).
|
| 11.0 |
|
Auxiliary fan (M4), stage 1 |
1
|
|
|
on right connector (2).
Ignition: ON
Ignition: OFF
Unplug engine coolant temperature sensor (B10/8).
Set resistance to 310
Ignition: ON |
11 - 14 V
M4: OFF
M4: ON in stage 1
< 1 V
|
Wires,
N22,
11.1 |
| 11.1 |
|
Auxiliary fan (M4), stage 1 |
2/5
1 |
|
|
Ignition: OFF
Unplug ECT sensor (B10/8).
B10/8
1  2
Set resistance to 310
Unplug auxiliary fan relay module (K9).
Ignition: ON
Ignition: ON
Ignition: OFF |
6.5 - 7.5 V
2.5 - 3.5 V
< 1 |
Wires.
Wires,
Auxiliary fan preresistor (R15).
R15,
Auxiliary fan relay module (K9).
|
| 12.0 |
|
Auxiliary fan (M4), stage 2 |
1
|
|
|
on right connector (2).
Ignition: ON
Ignition: OFF
Unplug ECT sensor (B10/8).
Set resistance to 250 .
Ignition: ON |
11 - 14 V
M4: OFF
M4: ON in stage 2
< 1 V |
12.1 |
| 12.1 |
|
Auxiliary fan, stage 2 |
|
K9
|
1 |
Ignition: OFF
Unplug auxiliary fan relay module (K9).
Ignition: ON
|
11 - 14 V |
Wires,
K9,
12.2 |
| 12.2 |
|
Auxiliary fan, stage 2 |
2/1 |
K9
|
2/5 |
Ignition: OFF
Unplug auxiliary fan relay module (K9).
|
< 1 |
Wires,
Auxiliary fan preresistor (R15). |
| 13.0 |
Gasoline engine only!
|
Engine rpm increase |
|
N22
|
10
|
on right connector (2).
Ignition: ON
Press pushbutton  |
< 1 V
9 - 14 V
|
Wires,
A/C pushbutton control
module (N22). |
| 14.0 |
|
Auxiliary coolant pump (M13) |
|
N22
|
12
|
on right connector (2).
Ignition: ON
Set temperature selector wheel to:
" Red " detent
Set temperature selector wheel to:
" Blue " detent
|
< 1 V
11 - 14 V |
14.1 ,
Wires,
N22. |
| 14.1 |
|
Auxiliary coolant pump (M13)
Resistance |
2/1  |
M13
|
 2/2 |
Ignition: OFF
Unplug connector from M13.
|
2 - 4 |
M13. |
| 15.0 |
|
Duovalve (Y21) |
|
N22
|
21 |
on right connector (2).
Ignition: ON
Press pushbutton:
 to display  
 to display  
|
11 - 14 V
< 1 V |
Wires,
15.1 ,
A/C pushbutton control
module (N22). |
| 15.1 |
|
Duovalve (Y21) |
18 |
N22
|
21
|
Ignition: OFF
Disconnect N22 from . |
10 - 18 |
Y21. |
| 16.0 |
|
Blower regulator (A32n1) control |
|
N22
|
1
|
on right connector (2).
Ignition: ON
 Stage 1
2
3
4 |
0.8 - 1.2 V
1.8 - 2.2 V
2.7 - 3.3 V
> 5 V
|
A/C system blower unit (A32). |
| 17.0 |
|
A/C compressor (A9) activation |
19 |
N22
|
25
|
on right connector (2).
Engine: At Idle
A/C compressor: 
A/C compressor:
|
< 1 V
11 - 14 V |
Wires,
17.1 ,
A/C pushbutton control
module (N22). |
| 17.1 |
|
A/C compressor cut-out |
25 |
N22
 |
|
on right connector (2).
Engine: At Idle
Reading Sensor Values
 12
LED display:
|
> 720 rpm
(>  )
|
Wires,
17.2 |
| 17.2 |
|
A/C compressor rpm
sensor (A9l1) |
27 |
N22
|
26
|
Disconnect N22 from .
on left connector (1). |
200 - 350 |
Wires,
A/C compressor rpm sensor (A9l1).
|
| 18.0 |
|
Not applicable for U.S. version vehicles
|
|
|
|
|
|
|
| 19.0 |
|
Switchover valve block (Y11/3), diverter flap |
15 |
N22
|
18
|
on right connector (2).
Ignition: ON
Display "
|
< 1 V |
Wires,
19.1 |
| 19.1 |
|
Switchover valve block (Y11/3), diverter flap |
15 |
N22
|
18
|
Disconnect N22 from . |
45 - 65 |
Wires,
A/C pushbutton control
module (N22).
|
| 20.0 |
|
Switchover valve block (Y11/3), tempering flap |
6 |
N22
|
18
|
on right connector (2).
Ignition: ON
Display " |
11 - 14 V |
Wires,
20.1 |
| 20.1 |
|
Switchover valve block (Y11/3), valve for blend air flap
|
6 |
N22
|
18
|
Disconnect N22 from . |
45 - 65 |
Wires,
N22. |
| 21.0 |
|
Switchover valve block (Y11/3), fresh/recirculating air flap, long stroke (80%)
|
5 |
N22
|
18
|
on right connector (2).
Ignition: ON |
< 1 V |
Wires,
21.1 |
| 21.1 |
|
Switchover valve block (Y11/3), fresh/recirculating air flap, long stroke (80%)
|
5 |
N22
|
18
|
Disconnect N22 from . |
45 - 65 |
Wires,
A/C pushbutton control
module (N22). |
| 22.0 |
|
Switchover valve block (Y11/3), fresh/recirculating air flap, short stroke (20%)
|
4 |
N22
|
18
|
on right connector (2).
Ignition: ON |
< 1 V |
Wires,
22.1 |
| 22.1 |
|
Switchover valve block (Y11/3), fresh/recirculating air flap, short stroke (20%)
|
4 |
N22
|
18
|
Disconnect N22 from . |
45 - 65 |
Wires,
N22. |
| 23.0 |
|
Switchover valve block (Y11/3), footwell flap, long stroke (80%) |
14 |
N22
|
18
|
on right connector (2).
Ignition: ON |
11 - 14 V |
Wires,
23.1 |
| 23.1 |
|
Switchover valve block (Y11/3), footwell flap, long stroke (80%)
|
14 |
N22
|
18
|
Disconnect N22 from . |
45 - 65 |
Wires,
A/C pushbutton control
module (N22). |
| 24.0 |
|
Switchover valve block (Y11/3), footwell flap, short stroke (20%) |
13 |
N22
|
18
|
on right connector (2).
Ignition: ON |
11 - 14 V |
Wires,
24.1 |
| 24.1 |
|
Switchover valve block (Y11/3), footwell flap, short stroke (20%)
|
13 |
N22
|
18
|
Disconnect N22 from . |
45 - 65 |
Wires,
N22. |
| 25.0 |
|
Switchover valve block (Y11/3), defroster flap, long stroke (80%) |
23 |
N22
|
18
|
on right connector (2).
Ignition: ON |
11 - 14 V |
Wires,
25.1 |
| 25.1 |
|
Switchover valve block (Y11/3), defroster flap, long stroke (80%)
|
23 |
N22
|
18
|
Disconnect N22 from . |
45 - 65 |
Wires,
A/C pushbutton control
module (N22). |
| 26.0 |
|
Switchover valve block (8 connections, Y11/3), defroster flap, short stroke (20%) |
22 |
N22
|
18
|
on right connector (2).
Ignition: ON |
< 1 V |
Wires,
26.1 |
| 26.1 |
|
Switchover valve block (Y11/3), defroster flap, short stroke (20%)
|
22 |
N22
|
18
|
Disconnect N22 from . |
45 - 65 |
Wires,
N22. |
| 27.0 |
|
Engine speed signal (TN)
|
|
N22
|
25
|
on left connector (1).
Engine: at Idle |
5 - 7.5 V |
Wires. |
Printable version
