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Diagnostic Manual, Info./Comm., Volume 1

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LOCATION:    4.4 Antenna Systems (AS)    >   23 Electrical Test Program - Test


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.