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Diagnostic Manual, Info./Comm., Volume 1

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LOCATION:    5.5 Loudspeaker Systems (LS)   >   23 Electrical Test Program - Test


Electrical Test Program - Test

Test scope Test connection Test condition Nominal value Possible cause/Remedy
1.0 Left/right audio power
amplifier (N40/3)
Voltage supply

9
N40/3

26
Radio (A2): OFF
Disconnect N40/3.

11 - 14 V
Fuse F4-16,
Fuse in N40/3 (Figure 1),
Ground (W6),
Wiring,
1.1 ,
If nominal value is OK:
Replace N40/3.
1.1 Control voltage from radio (A2)
9
N40/3

8
Disconnect N40/3.
Radio (A2): ON

11 - 14 V
Wiring,
Radio (see section 3.1 23 ),
1.2.
1.2 Speaker signal from radio (A2)
left front:
right front:
left rear:
right rear:


10

1


3

4
N40/3







18

2


5

6
Disconnect N40/3.
Turn volume control to maximum.
Radio (A2): ON

> 0.2 V~
A momentary lower value is permissible.
Wiring,
Radio (see section 3.1 23).
2.0 Left front door speaker
group (H4/1)

21



9

21
H4/1





13



13

9
Radio (A2): OFF
Disconnect N40/3.

Up to 06/95:
0.6 - 1.2
As of 07/95:
1.5 - 2.5



Wiring,
H4/1,
If nominal values are OK:
Replace N40/3.
3.0 Right front door speaker
group (H4/2)

14


9

14
H4/2




22


22

9
Radio (A2): OFF
Disconnect N40/3.

Up to 06/95:
0.6 - 1.2
As of 07/95:
1.5 - 2.5



Wiring,
H4/2,
If nominal values are OK:
Replace N40/3.
4.0 Sedan
Left rear door speaker (H4/3)
Coupé
Left front door speaker (H4/5)



15

9

15
H4/3
or
H4/5





23

23

9
Radio (A2): OFF
Disconnect N40/3.

Up to 06/95:
3.2 - 4.0
As of 07/95:
1.5 - 2.5


Wiring,
H4/3 or H4/5,
If nominal values are OK:
Replace N40/3.
5.0 Sedan
Right rear door speaker (H4/4)
Coupé
Right front door speaker (H4/6)



17


9

17
H4/4
or
H4/6






25


25

9
Radio (A2): OFF
Disconnect N40/3.

Up to 06/95:
3.2 - 4.0
As of 07/95:
1.5 - 2.5




Wiring,
H4/4 or H4/6,
If nominal values are OK:
Replace N40/3.
6.0 Left rear door speaker group (H4/7)
12

9

12
H4/7



20

20

9
Radio (A2): OFF
Disconnect N40/3.

0.6 - 1.4

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)

11

9

11
H4/8



19

19

9
Radio (A2): OFF
Disconnect N40/3.

0.6 - 1.4

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)
24

9

24
H4/11



16

16

9
Radio (A2): OFF
Disconnect N40/3.

3.6 - 4.2

Wiring,
H4/11,
If nominal values are OK:
Replace N40/3.