Diagnostic Manual, Info./Comm., Volume 1
Electrical Test Program - Test
 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
Electrolytic capacitor (rear glass noise suppressor C3)
Function
Model 163
|
|
|
|
Ignition: OFF
Radio (A2): ON
Tune radio to weak station reception on AM band
Start engine and run at idle.
Engine: at idle |
No change in radio reception
|
Capacitor (C3) |
| 2.0 |
High frequency connection wire from FM/AM amplifier (A2/18) to radio (A2)
Continuity
Short circuit
(inner shielding/signal wire) |
 |
|
|
Radio (2): OFF
Disconnect antenna cable from radio (A2) and FM/AM amplifier (A2/18), see
Figure 1 - model 163
Figure 2 - model 202, 208
Figure 3 model 210.0
|
< 10 
|
Wiring.
3.0 ,
|
| 3.0 |
High frequency connection wire from FM/AM amplifier (A2/18) to rear window antenna (A2/32)
Continuity
Short circuit
(inner shielding/signal wire) |
|
|
|
Radio (A2): OFF
Disconnect wire from AM/FM amplifier (A2/18) and rear window antenna (2/32)
|
< 10
|
Wiring,
|
| 4.0 |
Radio (A2)
Control voltage
|
W0
|
|
A2/18
 b |
Disconnect connector at FM/AM amplifier (A2/18),
see Figure 1, 2 or 3
Radio (A2): ON |
11 - 14 V
|
Wiring,
Radio (RD), 3.1  23
AD82.60 in WIS |
| 5.0 |
FM/AM amplifier (A2/18)
Current draw
|
A2/18
 |
|
A2
b |
Connect ampmeter between (A2/18) and control voltage wire from
radio (A2),
see Figure 1, 2 or 3
Radio (A2): ON
|
Model 163:
54 - 64 mA
Model 202:
59 - 69 mA
Model 208:
65 - 75 mA
Model 210:
52 - 80 mA |
A2/18,
W0 ground connection
6.0 ,
If nominal value is ok, but poor reception quality continues:
Swap A2/18 with known good unit and perform 11 Function Test.
|
| 6.0 |
Ground
FM/AM amplifier (A2/18) |
|
|
A2/18 |
Radio (A2): OFF
 Hint:
Do not loosen mounting connection on A2/18. Mounting connection also serves as ground.
|
< 1
|
Contact resistance at ground. |
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|
Printable version
