| |
|
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
|
Voltage supply
Circuit 30 |
12 
|
N19
 |
 1 |
|
11-14 V
|
Wiring,
Circuit 31,
 1.1 |
| 1.1 |
|
Circuit 30 |
 |
N19
|
1
|
|
11-14 V
|
Wiring. |
| 2.0 |
|
Voltage supply
Circuit 15 |
12 |
N19
|
1
|
Ignition: ON
|
11-14 V
|
Wiring. |
| 3.0 |
|
Voltage supply
Circuit 15x |
12
|
N19
|
22 |
Ignition: ON
|
11-14 V
|
Wiring. |
| 4.0 |
|
In-car temperature sensor (with aspirator blower) (B10/4)
Resistance |
3 |
N19
 |
28 |
Ignition: OFF
Disconnect N19 from . |
°C  k 
10 19.0 - 21.0
20 11.9 - 13.0
30 7.7 - 8.4
45 4.2 - 4.6
|
Wiring,
B10/4
|
| 5.0 |
     |
Evaporator temperature sensor (B10/6)
Resistance |
3 |
N19
|
24 |
Ignition: OFF
Disconnect N19 from . |
°C k
10 5.2-5.8
20 3.2-3.6
30 2.0-2.3
45 1.1-1.25
|
Wiring,
B10/6
|
| 6.0 |
 |
Left heater core temperature
sensor (B10/1)
Resistance
|
3
|
N19
|
26 |
Ignition: OFF
Disconnect N19 from .
|
°C k
10 19.0-21.2
20 11.9-13.2
30 7.7-8.4
45 4.2-4.6
|
Wiring,
B10/1 |
| 7.0 |
 |
Right heater core temperature
sensor (B10/2)
Resistance
|
3
|
N19
|
25 |
Ignition: OFF
Disconnect N19 from .
|
°C k
10 19.0-21.2
20 11.9-13.2
30 7.7-8.4
45 4.2-4.6
|
Wiring,
B10/1 |
| 8.0 |
|
Refrigerant pressure
sensor (B12)
Voltage
|
12 |
N19
|
27 |
Ignition: ON
|
bar V
2 0.5-0.75
10 1.4-1.8
18 2.4-2.8
28 3.5-4.0
|
Wiring,
B12,
8.1 ,
N19
|
| 8.1 |
|
Voltage |
12 |
N19
|
14 |
Ignition: ON
|
4.75-5.25 V
|
Wiring,
B12,
N19
|
| 9.0 |
 |
Auxiliary fan (M4)
Activation |
12
|
N19
|
19 |
Engine: At idle
Disconnect connector from refrigerant pressure
sensor (B12).
|
>0.5 V
|
Wiring,
Pulse module (N65),
Or
AIR control module (N65/1)
|
| 10.0 |
|
Diagnostic output |
12 |
N19
|
17
|
Ignition: ON |
11-14 V |
Wiring,
N19 |
| 11.0 |
|
A/C compressor (A9)
Activation |
12 |
N19
|
20 |
Engine: At idle
A/C compressor: 
A/C compressor: is not illuminated. |
<1 V
11 - 14 V
|
Wiring,
A9,
N19
|
| 12.0 |
 |
Coolant circulation
pump (M13)
Resistance |
2/1  |
M13
|
 2/2
|
Ignition: OFF
Disconnect connector from M13 |
2-4
|
Wiring,
M13
|
| 13.0 |
|
Idle speed increase
Voltage |
5 |
N19
|
1
|
Engine: At idle
is not illuminated. |
<1 V
>2 V
|
Wiring,
N19
|
| 14.0 |
 |
Left-side water
valve (Y21y1)
Voltage supply |
9 |
N19
|
1 |
Ignition: ON
Temperature selector
wheels:
Red range detent
Blue range detent |
After 15 seconds:
<1 V
11 - 14 V
|
Wiring,
1.1 ,
N19
|
| 14.1 |
|
Left duovalve
(Y21y1)
Resistance |
10 |
N19
|
9
|
Ignition: OFF
Disconnect N19 from .
|
20-35
|
Y21 |
| 15.0 |
|
Right-side water
valve (Y21y2)
Voltage |
1 |
N19
|
10 |
Ignition: ON
Both temperature selector
wheels:
Red range detent
Blue range detent |
<1 V
11 - 14 V
|
Wiring,
1.1 ,
N19
|
| 15.1 |
|
Right duovalve
(Y21y2)
Resistance |
10 |
N19
|
9
|
Ignition: OFF
Disconnect N19 from .
|
20-35
|
Y21 |
| 16.0 |
|
Blower regulator (A32n1)
Voltage |
12 |
N19
|
7 |
Ignition: ON
Blower switch in fan stage:
1
2
3
4
5 |
1.1 - 1.8 V
2.0 - 2.6 V
2.8 - 3.2 V
3.6 - 4.2 V
5.0 - 6.0 V
|
Wiring,
N19 |
| 17.0 |
 |
Fresh/recirculated air flap switchover valve (Y13)
Resistance |
16 |
N19
|
21
|
Disconnect from N19 |
45-65
|
Wiring.
|
| 18.0 |
|
Serial Interface K1 |
12 |
N19
 |
28
|
Engine: At Idle |
> 2 V ~
|
Wiring.
|
| 19.0 |
|
Serial Interface K2 |
12 |
N19
|
5
|
Engine: At Idle |
> 2 V ~
|
Wiring.
|
Printable version
