 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
Left/right audio power
amplifier (N40/3)
Voltage supply |
2 
11 |
N40/3
|
 1
10 |
Radio (A2): OFF
Disconnect N40/3. |
11 - 14 V |
Fuse F4-16,
Ground (W6),
Wiring,
1.1 ,
If nominal value is OK:
Replace N40/3.
|
| 1.1 |
Control voltage from
tuner/amplifier (A2/3) |
11 |
N40/3
|
19 |
Disconnect N40/3.
Radio: ON |
11 - 14 V
|
Wiring,
A2/3 (see 3 volume DM, EC&B, section EB-03).
|
| 1.2 |
Noise-frequency (line-out) signal from tuner/amplifier (A2/3) |
18
24
|
N40/3
|
27
9
|
Disconnect N40/3.
Turn volume control to maximum.
Radio: ON |
2.0 V~
A momentary lower value is permissible. |
Wiring,
A2/3 (see 3 volume DM, EC&B, section EB-03). |
| 2.0 |
Left front door speaker
group (H4/1) |
8
11
11 |
|
|
Radio (A2): OFF
Disconnect N40/3. |
0.7 - 1.2 
|
Wiring,
H4/1,
If nominal values are OK:
Replace N40/3.
|
| 3.0 |
Right front door speaker
group (H4/2) |
7
11
11 |
|
|
Radio (A2): OFF
Disconnect N40/3. |
0.7 - 1.2
|
Wiring,
H4/2,
If nominal values are OK:
Replace N40/3.
|
| 4.0 |
Left rear door speaker (H4/3)
|
6
11
11 |
|
|
Radio (A2): OFF
Disconnect N40/3. |
3.0 - 4.5
|
Wiring,
H4/3,
If nominal values are OK:
Replace N40/3.
|
| 5.0 |
Right rear door speaker (H4/4)
|
5
11
11 |
|
|
Radio (A2): OFF
Disconnect N40/3. |
3.0 - 4.5
|
Wiring,
H4/4,
If nominal values are OK:
Replace N40/3.
|
| 6.0 |
Left rear door speaker group (H4/7) |
4
11
11 |
|
|
Radio (A2): OFF
Disconnect N40/3. |
0.4 - 1.5
|
Wiring,
6.1 ,
If nominal values are OK:
Replace N40/3.
|
| 6.1 |
Left rear door speaker group (H4/7)
Individual speakers (H4/7h1 or H4/7h2) |
|
H4/7h1
or
H4/7h2
 |
|
Radio (A2): OFF
Disconnect speaker group connectors. |
1.8 - 2.4
|
H4/7h1 or H4/7h2. |
| 7.0 |
Right rear door speaker
group (H4/8) |
3
11
11 |
|
|
Radio (A2): OFF
Disconnect N40/3. |
0.4 - 1.5
|
Wiring,
7.1 ,
If nominal values are OK:
Replace N40/3.
|
| 7.1 |
Right rear door speaker
group (H4/8)
Individual speakers (H4/8h1 or H4/8h2) |
|
H4/8h1
or
H4/8h2
|
|
Radio (A2): OFF
Disconnect speaker group connectors. |
1.8 - 2.4
|
H4/8h1 or H4/8h2. |
| 8.0 |
Center fill tweeter speaker (H4/11) |
25
11
11 |
|
|
Radio (A2): OFF
Disconnect N40/3. |
3.5 - 5.0
|
Wiring,
H4/11,
If nominal values are OK:
Replace N40/3.
|
| 9.0 |
Fader switch (R26) |
20
21
20
11
11
11 |
|
|
Radio (A2): OFF
Disconnect N40/3.
R26 in center position.
R26 in center position.
Vary position of R26 from stop -to-stop.
R26 in center position. |
10 k
5 k
0 - 10 k
|
Wiring,
R26,
If nominal values are OK:
Replace N40/3.
|
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