 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
Radio (A2)
Voltage supply
Terminal 30
|
8 
(A.8) |
A2
|
 4
(A.4) |
Remove radio (A2).
Disconnect connector A
(Figure 1).
|
11 - 14 V
|
Wiring,
1.1. |
| 1.1 |
Voltage supply
Terminal 15 |
8
(A.8) |
A2
|
7
(A.7) |
Remove radio (A2).
Disconnect connector A
(Figure 1).
Ignition: ON
|
11 - 14 V
|
Wiring,
Fuse E in A2,
A2. |
| 2.0 |
Radio (A2)
Voltage supply for CD changer,
Terminal 30
Model 129, 140, 170, 202, 208, 210 up to 05/98
Model 124, 163 |
C
6 
|
A2
|
C
 4
|
Remove radio (A2).
Disconnect connector C
(Figure 1).
Measure on radio
connector C.
|
10 - 14 V
|
Wiring,
Fuse E in A2,
2.1 |
| 2.1 |
Voltage supply for CD changer, switched |
C
6
|
A2
|
C
5
|
Remove radio (A2).
Disconnect connector C
(Figure 1).
Ignition: ON
Radio: ON
Measure on radio
connector C.
|
10 - 14 V
|
Wiring,
Fuse E in A2,
A2 |
| 3.0 |
Radio (A2)
Voltage supply for CD changer (A2/6) Terminal 30
Model 129, 140, 170, 202, 208 and 210 as of 06/98 |
C
6
|
A2
 |
C
5
|
Remove radio (A2)
Disconnect connector C
Measure on back of connector C. |
10 - 14 V |
Wiring,
Fuse E in A2 |
| 4.0 |
Radio (A2)
Left front loudspeaker output |
B
6
|
A2
|
B
5
|
Remove radio (A2)
Disconnect connector B
Radio: ON
Measure on back of connector B.
Turn volume control to maximum. |
> 0.2 V~ |
A2
Values OK: Loudspeaker system
(LS) - 5.3  23
AD82.62-P-6001 in WIS
Note:
Additionally test loudspeaker output with a single speaker.
|
| 5.0 |
Radio (A2)
Right front loudspeaker output |
B
4 |
A2
|
B
3
|
Remove radio (A2).
Disconnect connector B
Radio: ON
Measure on back of connector B.
Turn volume control to maximum. |
> 0.2 V~ |
A2
Values OK: Loudspeaker system
(LS) - 5.3 23
AD82.62-P-6001 in WIS
Note:
Additionally test loudspeaker output with a single speaker.
|
| 6.0 |
Radio (A2)
Left rear loudspeaker output |
B
7
|
A2
|
B
8
|
Remove radio (A2).
Disconnect connector B
Radio: ON
Measure on back of connector B.
Turn volume control to maximum. |
> 0.2 V~ |
A2
Values OK: Loudspeaker system
(LS) -5.3 23
AD82.62-P-6001 in WIS
Note:
Additionally test loudspeaker output with a single speaker.
|
| 7.0 |
Radio (A2)
Right rear loudspeaker output |
B
2 |
A2
|
B
1
|
Remove radio (A2).
Disconnect connector B
Radio: ON
Measure on back of connector B.
Turn volume control to maximum. |
> 0.2 V~ |
A2
Values OK: Loudspeaker system
(LS) - 5.3 23
AD82.62-P-6001 in WIS
Note:
Additionally test loudspeaker output with a single speaker.
|
| 8.0 |
Radio (A2)
Radio interference |
|
|
|
Radio: ON
Set reception frequency (e.g. 87.9) with no station.
Engine: OFF
Ignition: ON
|
No interference |
Ground connections,
Wiring,
Electronic components,
80.1 |
| 8.1 |
Radio (A2)
Radio interference |
|
|
|
Radio: ON
Set reception frequency (e.g. 87.9) with no station.
Engine: at Idle |
No interference. |
Ground connections,
Wiring,
Electronic components,
Ignition system,
Engine control system
Values OK: Antenna system (AS) - 4 23
AD82.62-P-6000 in WIS
Note:
Additionally test, using a
seperate antenna.
|
| 9.0 |
Radio (A2)
Radio reception |
|
|
|
Radio: ON
Tune in strong station.
Perform test drive.
|
Radio reception OK. |
Ground connections,
Wiring,
A2,
Radio station,
Tranmitter antenna.
Values OK: Antenna system
D.M., Information/Communication, Vol.1, - 4 23
AD82.62-P-6000 in WIS
Note:
Additionally test, using a
separate antenna. |
| 10.0 |
Radio (A2)
Activation of automatic
antenna (M11) or antenna system (AS), left/right audio power amplifier (N40/3)
Model 163:
Activation of radio/speakers power amplifier control module (N40/6) |
8
(A.8) |
A2
|
5
(A.5) |
Remove radio (A2).
Do not unplug connector.
Radio: ON |
9 - 14 V |
A2,
Values OK: Antenna system (AS) - 4 23
Loudspeaker system (LS)
- 5 23 ,
AD82.62-P-6000 in WIS
AD82.62-P-6001 in WIS
Left/right audio power
amplifier (N40/3).
Model 163:
N40/6 |
| 11.0 |
Radio (A2)
Speed sensitive volume control
Except model 163 |
8
(A.8) |
A2
|
1
(A.1) |
Remove radio (A2).
Do not unplug connectors.
Connect signal generator and set to a voltage amplitude of
approx. 2 - 4 V.
Radio: ON |
The volume increases with increasing frequency between 0 - 300 Hz. |
Wiring,
Vehicle speed signal,
A2
Values OK:
AD54.30-P-6000 in WIS
Model 129
Instrument cluster (IC) - 1 23
Model 140
Instrument cluster (IC) - 1 23
Model 202, 208, 210
ABS control module (N30),
ASR control module (N30/1),
ASR/SPS or ETS/SPS control modules (N47-1 or N47-2).
|
| 12.0 |
Radio (A2)
Radio illumination with park lamps off |
8
(A.8) |
A2
|
7
(A.7) |
Remove radio (A2).
Do not unplug connectors.
Ignition: ON
Radio: ON |
11 - 14 V
ON-button illuminated.
ON-button and display illuminated.
|
Wiring,
Fuse E in A2,
A2,
12.1 |
| 12.1 |
Radio (A2)
Radio illumination with park lamps on |
8
(A.8) |
A2
|
6
(A.6) |
Remove radio (A2).
Do not unplug connectors.
Park lamps: ON
Radio: ON |
11 - 14 V
Switches and buttons illuminated.
Switches, buttons and radio display illuminated. |
Wiring,
Fuse E in A2,
A2 |
| 13.0 |
Radio (A2)
Radio muting by telephone system |
8
(A.8) |
A2
 |
3
(A.3) |
Remove radio (A2).
Do not unplug connectors.
Radio: ON |
Radio is muted, the display window shows: PHONE
|
Wiring,
A2,
Telephone system. |
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