STI Home
Diagnostic Manual, Info./Comm., Volume 1

 Printable version
LOCATION:    5.13 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
Disconnect connector from N40/3.
Radio (A2): OFF

11 - 14 V
Fuse 12 in fuse and relay
box (F1),
Fuse in N40/3,
Ground (W6, W7),
Wiring,
Values OK:
1.1
1.1 Control voltage from radio (A2)
9
N40/3

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

11 - 14 V
Wiring,
Loudspeaker signal from radio (A2)
Values OK:
2
2.0 Left/right audio power amplifier (N40/3)
Loudspeaker signal from
radio (A2)
Left front:
Right front:
Left rear:
right rear:





10

1

3

4




N40/3







18

2

5

6

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




> 0.2 V~
Short voltage surges permitted
Wiring,
Radio (A2), see 3.1 23 ,
AD82.60 in WIS

3.0 Left door speaker (H4/5)
15


9

9
H4/5




23


15

23
Disconnect connector from N40/3.
Radio (A2): OFF

1.5 - 2.5


Wiring,
Connectors,
H4/5
Values OK:
N40/3
4.0 Left front door speaker group (H4/1)
9

9

21
H4/1



13

21

13
Disconnect connector from N40/3.
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.
H4/1
Wiring,
Connectors,
Values OK:
N40/3
5.0 Left rear speaker (H4/7)
Model 208.3

12


9

9
H4/7




20


12

20
Disconnect connector from N40/3.
Radio (A2): OFF

1.5 - 2.5


H4/7
Wiring,
Values OK:
N40/3
6.0 Right door speaker (H4/6)
17

9
9
H4/6


25

17
25
Disconnect connector from N40/3.
Radio (A2): OFF

1.5 - 2.5


Wiring,
Connectors,
H4/6
Values OK:
N40/3
7.0 Right front door speaker group (H4/1)
9

9


14
H4/2




14

22


22
Disconnect connector from N40/3.
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.
H4/2
Wiring,
Connectors,
Values OK:
N40/3
8.0 Right rear speaker (H4/8)
Model 208.3

11


9

9
H4/8




19


11

19
Disconnect connector from N40/3.
Radio (A2): OFF

1.5 - 2.5


H4/8.
Wiring,
Values OK:
N40/3
9.0 Subwoofer speaker (H4/29)
Model 208.4


H4/29



Radio (A2): OFF
Remove speaker and disconnect speaker connector (H4/29x1). Measure directly on speaker.
around 4

H4/29.
Values OK:
Wiring,
Connectors,
N40/3