 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
Radio/speakers audio power amplifier control module (N40/6)
Voltage supply |
A 
|
N40/6
 |
 H
|
Disconnect connector 1 from N40/6.
Radio (A2): OFF |
11 - 14 V |
Fuse 21 in fuse and relay
box (F1),
Ground (W29/2),
Wiring,
Values OK:
1.1 |
| 1.1 |
Control voltage from radio (A2) |
A |
N40/6
|
A1 |
Disconnect connector 1 and 2 from N40/6.
Radio (A2): ON |
11 - 14 V |
Wiring,
AD82.60 in WIS
Loudspeaker signal from radio (A2)
2 |
| 2.0 |
Radio/speakers audio power amplifier control module (N40/6)
Loudspeaker signal from
radio (A2)
Left front:
Right front:
Left rear:
right rear: |
B12
B9
B11
B10 |
|
|
Disconnect connector 2 from N40/6.
Radio (A2): ON
Turn volume control to maximum. |
> 0.2 V~
Short voltage surges permitted |
Wiring,
AD82.60 in WIS
|
| 3.0 |
Left rear door speaker (H4/3) |
B
A
A |
|
|
Disconnect connector 1 from N40/6.
Radio (A2): OFF |
1.5 - 2.5 
|
Wiring,
Connectors,
H4/3
Values OK:
N40/6 |
| 4.0 |
Right rear door speaker (H4/4) |
A10
A
A |
|
|
Disconnect connector 1 and 2 from N40/6.
Radio (A2): OFF |
1.5 - 2.5
|
Wiring,
Connectors,
H4/4
Values OK:
N40/6 |
| 5.0 |
Left front door speaker (H4/5) |
A
A
A11 |
|
|
Disconnect connector 1 and 2 from N40/6.
Connect function generator and set a frequency of 100 to 10,000 Hz with a voltage amplitude of 2 V.
Radio (A2): OFF
Voltage amplitude changes result in volume changes; Frequency changes result in tone changes. |
The set frequency can be heard via the speakers. |
H4/5
Wiring,
Connectors,
Values OK:
N40/6 |
| 6.0 |
Right front door speaker (H4/6) |
A
A
A7 |
|
|
Disconnect connector 1 and 2 from N40/6.
Connect function generator and set a frequency of 100 to 10,000 Hz with a voltage amplitude of 2 V.
Radio (A2): OFF
Voltage amplitude changes result in volume changes; Frequency changes result in tone changes. |
The set frequency can be heard via the speakers. |
H4/6
Wiring,
Connectors,
Values OK:
N40/6 |
| 7.0 |
Acoustimass® bass module (H4/17)
Bass module speaker 1
Bass module speaker 1 |
F
A
A
E
A
A |
|
|
Disconnect connector 1 from N40/6.
Radio (A2): OFF |
1.5 - 2.5
1.5 - 2.5
|
Wiring,
H4/17,
Values OK:
N40/6 |
Printable version
