 |
 |
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
|
21 |
Ignition: ON
|
11-14 V
|
Wiring.
|
| 3.0 |
|
Voltage supply
Circuit 15x |
12
|
N19
|
22 |
Ignition: ON
|
11-14 V
|
Wiring.
|
| 4.0 |
     |
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
|
| 5.0 |
 |
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
|
| 6.0 |
 |
Right heater core
temperature
sensor (B10/2)
Resistance
|
3
|
N19
|
25 |
Ignition: OFF
Disconnect N19 from .
|
°C k
10 9.0-21.2
20 1.9-13.2
30 7.7-8.4
45 4.2-4.6
|
Wiring,
B10/6 |
| 7.0 |
|
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,
7.1 ,
N19
|
| 7.1 |
|
Voltage |
12 |
N19
|
14 |
Ignition: ON
|
4.75-5.25 V
|
Wiring,
B12,
N19
|
| 8.0 |
|
Diagnostic output |
12
|
N19
|
17 |
Ignition: ON
|
8-11 V
|
Wiring,
N19
|
| 9.0 |
 |
A/C compressor (A9)
Activation
|
12 |
N19
|
20 |
Engine: At Idle
A/C compressor:
 is illuminated.
A/C compressor:
is not
illuminated.
|
<1 V
11-14 V
|
Wiring,
A9,
N19 |
| 10.0 |
 |
Left-side water valve
(Y21/1)
Voltage |
9 |
N19
|
1 |
Ignition: ON
Temperature selector
wheels:
Red range detent
Blue range detent |
After > 5
seconds:
<1 V
11 - 14 V
|
Wiring,
10.1 ,
N19
|
| 10.1 |
|
Resistance |
10 |
N19
|
9
|
Ignition: OFF
Disconnect N19 from . |
25-40
|
Y21
|
| 11.0 |
|
Right-side water valve
(Y21/2)
Voltage |
10 |
N19
|
1 |
Ignition: ON
Temperature selector
wheels:
Red range detent
Blue range detent |
<1 V
11 - 14 V
|
Wiring,
11.1 ,
N19
|
| 11.1 |
|
Resistance |
10 |
N19
|
9
|
Ignition: OFF
Disconnect N19 from .
|
25-40
|
Y21 |
| 12.0 |
|
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 - 3.3 V
3.6 - 4.3 V
5.0 - 6.0 V
|
Wiring,
N19 |
| 13.0 |
 |
Fresh/recirculated air flap
switchover valve (Y13)
Resistance |
16 |
N19
|
21
|
Disconnect N19 from . |
40-55
|
Wiring.
|
| 14.0 |
|
Serial Interface K1 |
12 |
N19
 |
18
|
Engine: At Idle |
> 1.5 V ~
|
Wiring,
See connection of components,
 21
|
| 15.0 |
|
Serial Interface K2 |
12 |
N19
|
5
|
Engine: At Idle |
> 0.2 V ~
|
Wiring,
See connection of components,
21
|
| 16.0 |
 |
Coolant circulation
pump (M13)
Resistance
(as of 09/97)
|
20 |
M13
|
28
|
to right hand connector,
Ignition: OFF
Disconnect from N22 |
3-7
|
Wiring,
M13
|
Printable version
