 |
 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
|
Voltage supply, circuit 30
for A/C pushbutton control module (N22) |
1  |
N22
 |
 11 |
 on right connector (2). |
11 - 14 V |
Wiring,
1.1 ,
Circuit 31.
|
| 1.1 |
|
Circuit 30 |
 |
N22
|
11
|
|
11 - 14 V |
Wiring. |
| 2.0 |
|
Voltage supply, circuit 15 |
1 |
N22
|
2
|
on right connector (2).
Ignition: ON |
11 - 14 V |
Wiring. |
| 3.0 |
|
Voltage supply, circuit 15x |
1 |
N22
|
20
|
on right connector (2).
Ignition: ON |
11 - 14 V |
Wiring. |
| 4.0 |
  
 |
Switch circuit,
in-car temperature sensor with aspirator
blower (B10/4) |
10 |
N22
|
8 |
on right connector (2).
Ignition: ON |
oC V
10 3.2 - 3.5
20 2.6 - 2.9
30 2.0 - 2.4
45 1.3 - 1.7
|
Wiring,
4.1 ,
A/C pushbutton control
module (N22). |
| 4.1 |
|
In-car temperature sensor (B10/4) with aspirator blower |
10 |
N22
 |
8 |
on right connector (2).
Ignition: OFF
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
|
Wiring,
B10/4. |
| 5.0 |
 
 |
Switch circuit,
outside temperature
sensor (B10/5) |
10 |
N22
|
26 |
on right connector (2).
Ignition: ON |
oC V
10 3.2 - 3.5
20 2.6 - 2.9
30 2.0 - 2.4
45 1.3 - 1.7
|
Wiring,
5.1 ,
N22. |
| 5.1 |
|
Outside temperature
sensor (B10/5) |
10 |
N22
|
26 |
on right connector (2).
Ignition: OFF
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
|
Wiring,
B10/5. |
| 6.0 |
|
Switch circuit,
evaporator temperature
sensor (B10/6) |
10 |
N22
|
25 |
on right connector (2).
Ignition: ON |
oC V
0 2.2 - 2.6
10 1.6 - 2.0
20 1.2 - 1.5
30 0.8 - 1.1
45 0.5 - 0.7
|
Wiring,
6.1 ,
A/C pushbutton control
module (N22). |
| 6.1 |
|
Evaporator temperature
sensor (B10/6) |
10 |
N22
|
25 |
on right connector (2).
Ignition: OFF
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
|
Wiring,
B10/6. |
| 7.0 |
|
Switch circuit,
left heater core temperature sensor (B10/2) |
10 |
N22
|
16 |
on right connector (2).
Ignition: ON |
oC V
10 3.1 - 3.5
20 2.6 - 2.9
30 2.0 - 2.4
45 1.3 - 1.7
|
Wiring,
7.1 ,
N22. |
| 7.1 |
|
Left heater core temperature sensor (B10/2) |
10 |
N22
|
16 |
on right connector (2).
Ignition: OFF
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
|
Wiring,
B10/2. |
| 8.0 |
|
Switch circuit,
right heater core temperature sensor (B10/3) |
10 |
N22
|
7 |
on right connector (2).
Ignition: ON |
oC V
10 3.1 - 3.5
20 2.6 - 2.9
30 2.0 - 2.4
45 1.3 - 1.7
|
Wiring,
8.1 ,
A/C pushbutton control
module (N22). |
| 8.1 |
|
Right heater core temperature sensor (B10/3) |
10 |
N22
|
7 |
on right connector (2).
Ignition: OFF
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
|
Wiring,
B10/3. |
| 9.0 |
|
Switch circuit,
ECT sensor (B10/8) |
10 |
N22
|
6 |
on right connector (2).
Ignition: ON |
oC V
20 4.3 - 4.7
60 2.9 - 3.6
85 2.0 - 2.5
100 1.6 - 1.9
120 1.0 - 1.4
|
Wiring,
9.1 ,
N22. |
| 9.1 |
|
ECT sensor (B10/8) |
10 |
N22
|
6 |
on right connector (2).
Ignition: OFF
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
|
Wiring,
B10/8. |
| 10.0 |
|
Refrigerant pressure
sensor (B12) |
10 |
N22
|
24 |
on right connector (2).
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,
10.1 ,
A/C pushbutton control
module (N22). |
| 10.1 |
|
Voltage supply
Refrigerant pressure
sensor (B12) |
10 |
N22
|
19 |
on right connector (2).
Ignition: ON |
4.75 - 5.25 V |
Wirring,
B12,
N22. |
| 11.0 |
|
Right potentiometer
(temperature selector wheel) |
1 |
N22
|
12 |
on right connector (2).
Ignition: ON
Temperature selector wheel in:
Blue area
Red area
|
< 1 V continuous
>3.5 V |
N22. |
| 12.0 |
|
Left potentiometer
(temperature selector wheel) |
1 |
N22
|
3 |
on right connector (2).
Ignition: ON
Temperature selector wheel in:
Blue area
Red area
|
< 1 V continuous
>3.5 V |
N22. |
| 13.0 |
|
Blower potentiometer
(temperature selector wheel) |
1 |
N22
|
21 |
on right connector (2).
Ignition: ON
Potentiometer setting:
min
max |
< 1 V continuous
> 4 V
|
A/C pushbutton control
module (N22). |
| 14.0 |
|
Voltage supply
Auxiliary coolant pump control relay module (REST) (K30) |
|
|
N22
2 |
on left connector (1).
Ignition: OFF
Ignition: ON |
11 - 14 V
< 1 V |
Wiring,
K30,
N22.
Wiring,
Ignition/starter switch (S2/1),
N22.
|
| 15.0 |
|
Warm/cool air switch (S24/1) |
|
N51
|
N22
6 |
on left connector (1).
Ignition: ON
Press 
Set blower wheel to AUTO.
Press and hold warm air button (red): ON |
4.75 - 5.25 V
2 - 3 V
Red LED indicator in (S24/1) comes on.
|
Wiring,
S24/1,
A/C pushbutton control
module (N22).
15.1. |
| 15.1 |
|
LED for warm air |
|
|
N22
1 |
Ignition: ON
Warm air button: OFF
Warm air button: ON |
11 - 14 V
no LED
< 5 V
LED comes on
|
Wiring,
S24/1,
N22. |
| 16.0 |
|
Warm/cool air switch (S24/1) |
|
|
N22
6 |
on left connector (1)
Ignition: ON
Press
Set blower wheel to AUTO.
Press and hold cool air button (blue): ON |
4.75 - 5.25 V
< 1 V
Blue LED indicator in (S24/1) comes on.
|
Wiring,
S24/1,
A/C pushbutton control
module (N22).
16.1. |
| 16.1 |
|
|
|
|
N22
19 |
Ignition: ON
Cool air button: OFF
Cool air button: ON |
11 - 14 V
no LED
< 5 V
LED comes on
|
Wiring,
S24/1,
N22. |
| 17.0 |
|
Active charcoal filter
switch (S24/2)
(if so equipped) |
|
|
N22
16 |
on left connector (1)
Ignition: ON |
4.75 - 5.25 V |
17.1 |
| 17.1 |
|
Active charcoal filter
switch (S24/2) |
|
|
N22
10 |
Ignition: ON
Press and hold charcoal filter button: ON
Press and hold charcoal filter button: OFF
|
2 - 3 V
LED indicator in S24/2 comes on
< 1 V |
Wiring,
S24/2,
A/C pushbutton control
module (N22).
17.2
Wiring,
S24/2,
N22.
|
| 17.2 |
|
LED for active charcoal filter |
|
|
N22
10 |
Ignition: ON
Charcoal filter button: ON
Charcoal filter button: OFF |
11 - 14 V
LED comes on
< 4 V
no LED
|
Wiring,
S24/2,
N22. |
| 18.0 |
|
Activated charcoal filter
actuator (A32m2) |
25
7
|
|
7
25 |
on left connector (1).
Ignition: ON
Press and hold charcoal filter button: ON
Press and hold charcoal filter button: OFF |
11 - 14 V
11 - 14 V |
18.1 ,
18.1 |
| 18.1 |
|
Activated charcoal filter
actuator (A32m2) |
7 |
N22
|
25 |
Ignition: OFF
Disconnect N22 from . |
50 - 80 |
Wiring,
A32m2,
S24/2,
A/C pushbutton control
module (N22).
|
| 19.0 |
|
Auxiliary fan (M4), stage 1
(up to M.Y. 1993) |
1
|
|
|
on left connector (1).
Ignition: ON
Auxiliary fan, stage 1: OFF
Ignition: OFF
Disconnect ECT sensor (B10/8).
Simulate a resistance of
310
Ignition: ON |
11 - 14 V
Auxiliary fan (M4) runs in stage 1
< 1 V |
Wiring,
9.0 ,
10.0 ,
A/C pushbutton control
module (N22).
19.1
|
| 19.1 |
|
Auxiliary fan (M4), stage 1 |
1
2/5 |
|
|
Ignition: OFF
Simulate a resistance of
310 .
Disconnect auxiliary fan relay module (K9).
Ignition: ON
Ignition: ON |
6.5 - 7.5 V
2.5 - 3.5 V |
Wiring,
M4
Wiring,
Auxiliary fan preresistor (R15).
|
| [19.1] |
|
|
1 |
R15
|
2 |
Ignition: OFF |
< 1 |
Auxiliary fan preresistor,
stage 1 (R15/1),
Auxiliary fan relay module,
stage 1 (K9).
|
| 20.0 |
|
Auxiliary fan (M4), stage 2 |
1
|
|
|
on left connector (1).
Ignition: ON
Auxiliary fan, stage 2: OFF
Ignition: OFF
Disconnect ECT sensor (B10/8).
Simulate a resistance of
250 .
Ignition: ON
|
11 - 14 V
Auxiliary fan (M4) runs in stage 2
< 1 V |
20.1
20.1
|
| 20.1 |
|
Auxiliary fan (M4), stage 2 |
|
K9/1
|
1 |
Ignition: OFF
Disconnect auxiliary fan relay module (K9/1).
Ignition: ON |
11 - 14 V |
Wiring,
Auxiliary fan relay module,
stage 2 (K9),
20.2
|
| 20.2. |
|
Auxiliary fan (M4), stage 2 |
2/1 |
K9
|
2/5 |
Disconnect auxiliary fan relay module (K9) |
< 1 |
Wiring,
Auxiliary fan preresistor,
stage 2 (R15).
|
| 21.0 |
|
Auxiliary fan (M4), stage 3 |
1
|
|
|
on left connector (1).
Ignition: ON
Auxiliary fan, stage 3: OFF
Ignition: OFF
Disconnect ECT sensor (B10/8).
Simulate a resistance of
200 .
Ignition: ON
Auxiliary fan, stage 3: ON
|
11 - 14 V
Auxiliary fan (M4) runs in stage 3
< 1 V
|
Auxiliary fan relay module,
stage 2 (K9).
Wiring,
K9,
A/C pushbutton control
module (N22).
|
| 22.0 |
|
Diagnostic signal output |
|
N22
|
18 |
Ignition: ON |
11 - 14 V |
Wiring,
A/C pushbutton control
module (N22).
|
| 23.0 |
|
Engine rpm increase diode matrix (V2) |
|
N22
|
22 |
on left connector (1).
Ignition: ON
Press  |
< 1 V
10 - 12 V
|
Wiring,
V2,
DM, Engines, Vol. 3 - 6.2  23 ,
N22. |
| 24.0 |
|
Coolant circulation
pump (A31m1) |
|
N22
|
12 |
on left connector (1).
Ignition: ON
Both temperature selector wheels at:
Red detent
Blue detent |
< 1 V
11 - 14 V
|
24.1 ,
Wiring,
N22. |
| 24.1 |
|
Coolant circulation
pump (A31m1) |
2/1  |
A31m1
|
 2/2 |
Ignition: OFF
Disconnect connector 2 from A31m1.
|
2 - 4 |
A31m1. |
| 25.0 |
|
Right duovalve (A31y2) |
|
N22
|
3 |
on left connector (1).
Ignition: ON
Both temperature selector wheels at:
Red detent
Blue detent |
11 - 14 V
< 1 V
|
Wiring,
25.1 ,
A/C pushbutton control
module (N22). |
| 25.1 |
|
Left/right duovalve
(A31y1, A31y2) |
3 |
N22
|
21
|
Ignition: OFF
Disconnect N22 from |
20 - 35 |
A31y1,
A31y2. |
| 26.0 |
|
Left duovalve (A31y1) |
|
N22
|
21 |
on left connector (1).
Ignition: ON
Press
Both temperature selector wheels at:
Red detent
Blue detent |
11 - 14 V
< 1 V
|
Wiring,
25.1 ,
N22. |
| 27.0 |
|
Blower regulator (A32n1) |
|
N22
|
20 |
on left connector (1).
Ignition: ON
Fan selector wheel set to:
MIN
MAX |
< 1 V
> 5 V, blower motor running
|
A/C system blower unit (A32). |
| 28.0 |
|
Left front axle vehicle speed signal |
|
N22
 |
8 |
Raise front of vehicle off ground (parking brake engaged).
Selector lever position: "N"
Ignition: ON
Turn left front wheel by hand
(> 1 revolution/second). |
> 3 V~ |
Wiring,
DM, Chassis and Drivetrain, Vol. 2 - 4.2 >11 or,
DM, Chassis and Drivetrain, Vol. 2 - 5.2 >11 or,
DM, Chassis and Drivetrain, Vol. 2 - 6.2 >11 ,
A/C pushbutton control
module (N22).
|
| 29.0 |
|
Non-USA vehicles only.
Continue to next test step. |
|
|
|
|
|
|
| 30.0 |
|
Switch circuit,
ground activation for A/C compressor (A9) |
|
N22
|
17 |
on left connector (1).
Ignition: ON
A/C compressor: 
A/C compressor: |
9 - 12 V
< 1 V |
Wiring,
Base module (N16/1),
DM, Chassis and Drivetrain, Vol. 1 - 1.0 >11/1 ,
N22.
|
| 31.0 |
|
Switch circuit,
A/C compressor electromagnetic clutch (A9k1) |
|
N22
|
23 |
on left connector (1).
Engine: at Idle
(parking brake engaged and selector lever in "P").
Press
A/C compressor:
A/C compressor: |
< 1 V
11 - 14 V
|
Wiring,
N16/1,
DM, Chassis and Drivetrain, Vol. 1 - 1.0 >11/1,
A/C compressor rpm sensor (A9l1),
DM, Chassis and Drivetrain, Vol. 1 - 1.0 >23,
N22.
|
| 32.0 |
|
Voltage supply, circuit 15
for rear A/C pushbutton control module (N22/3)
|
20 |
N22/3
|
1 |
Ignition: ON |
11 - 14 V |
Wiring. |
| 32.1 |
|
Circuit 15 |
|
N22/3
|
1
|
Ignition: ON |
11 - 14 V |
Wiring. |
| 33.0 |
|
Rear evaporator temperature
sensor (B10/11) |
4 |
N22/3
|
18 |
Ignition: ON |
oC V
0 2.2 - 2.6
10 1.6 - 2.0
20 1.2 - 1.5
30 0.8 - 1.1
45 0.5 - 0.7
|
33.1. |
| 33.1 |
|
Rear evaporator temperature sensor (B10/11) |
4 |
N22/3
|
18 |
Ignition: OFF
Disconnect N22/3 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
|
Wiring,
B10/11,
Rear A/C pushbutton control
module (N22/3). |
| 34.0 |
|
Left rear heater core temperature sensor (B10/9) |
4 |
N22/3
|
14 |
Ignition: ON |
oC V
10 3.1 - 3.5
20 2.6 - 2.9
30 2.0 - 2.4
45 1.3 - 1.7
|
34.1.
|
| 34.1 |
|
Left rear heater core temperature sensor (B10/9) |
4 |
N22/3
|
14 |
Ignition: OFF
Disconnect N22/3 from . |
oC k
10 19.0 - 21.2
20 11.9 - 13.2
30 7.7 - 8.4
45 4.2 - 4.6
|
Wiring,
B10/9,
Rear A/C pushbutton control
module (N22/3). |
| 35.0 |
|
Right rear heater core temperature
sensor (B10/10) |
4 |
N22/3
|
16 |
Ignition: ON |
oC V
10 3.1 - 3.5
20 2.6 - 2.9
30 2.0 - 2.4
45 1.3 - 1.7
|
35.1. |
| 35.1 |
|
Right rear heater core temperature sensor (B10/10) |
4 |
N22/3
|
16 |
Ignition: OFF
Disconnect N22/3 from . |
oC k
10 19.0 - 21.2
20 11.9 - 13.2
30 7.7 - 8.4
45 4.2 - 4.6
|
Wiring,
B10/10,
N22/3. |
| 36.0 |
|
Potentiometer, rear A/C blower speed selector wheel (N22/3) |
20 |
N22/3
|
11 |
Ignition: ON
Potentiometer setting:
MIN (0 not engaged)
MAX |
< 1 V
infinitely variable
> 4 V
|
Rear A/C pushbutton control
module (N22/3). |
| 37.0 |
|
Right Potentiometer (temperature selector wheel) |
20 |
N22/3
|
15 |
Ignition: ON
Temperature selector wheel in:
Blue area
Red area
|
< 1 V
infinitely variable
> 4 V |
N22/3. |
| 38.0 |
|
Left potentiometer
(temperature selector wheel) |
20 |
N22/3
|
17 |
Ignition: ON
Temperature selector wheel in:
Blue area
Red area
|
< 1 V continuous
> 4 V |
N22/3. |
| 39.0 |
|
Rear refrigerant shut-off
valve (Y67) |
9 |
N22/3
|
1 |
Rear A/C: ON
Rear A/C: OFF |
11 - 14 V
< 1 V |
Wiring,
N22/3. |
| 40.0 |
|
Coolant circulation
pump (A31/1m1) |
19 |
N22/3
|
1 |
Ignition: ON
Both temperature selector wheels at:
Red detent
Blue detent
|
11 - 14 V
< 1 V |
Wiring,
40.1. |
| 40.1 |
|
Coolant circulation
pump (A31/1m1) |
2/1 |
A31/1m1
|
2/2 |
Ignition: OFF
Connector 2 disconnected from A31/1m1.
|
2 - 4 |
A31/1m1,
Rear A/C pushbutton control
module (N22/3). |
| 41.0 |
|
Right duovalve (A31/1y2) |
5 |
N22/3
|
1 |
Ignition: ON
Both temperature selector wheels at:
Red detent
Blue detent
|
< 1 V
11 - 14 V |
Wiring,
42.1 ,
N22/3. |
| 42.0 |
|
Left duovalve (A31/1y1) |
7 |
N22/3
|
1 |
Ignition: ON
Both temperature selector wheels at:
Red detent
Blue detent
|
< 1 V
11 - 14 V |
Wiring,
42.1.
|
| 42.1 |
|
Left/right duovalve
(A31/1y1, A31/1y2) |
5 |
N22/3
|
7 |
Ignition: OFF
Disconnect N22/3 from . |
20 - 35 |
A31/1y1,
A31/1y2,
Rear A/C pushbutton control
module (N22/3).
|
| 43.0 |
|
Rear A/C electronic blower regulator (N29/2) |
|
N22/3
|
11 |
Ignition: ON
Blower speed wheel set to:
MIN (not 0)
MAX |
< 1 V
> 5 V, blower motor running
|
Wiring,
N29/2,
Rear blower motor (M2/1). |
| 44.0 |
|
Rear tunnel flap vacuum
valve (Y67/1) |
6 |
N22/3
|
1 |
Rear A/C: OFF
Rear A/C: ON |
< 1 V
> 9 V |
Wiring,
Y67/1. |
Printable version
