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Diagnostic Manual, Info./Comm., Volume 1

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LOCATION:    4.1 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 Noise suppression capacitor
Function


 


 


 


 

 

Ignition: OFF
Radio: ON
Tune-in a weak AM radio station.
Engine: at Idle
No change in reception quality.
Replace noise suppression capacitor on right C-pillar.
2.0 RF antenna cable to radio (A2)
Continuity


Short circuit
(inner shielding)



Radio: OFF
Disconnect antenna cable (b) between A2 and A2/16.

< 10




Wiring.
3.0 RF antenna cable to bumper FM antenna amplifier (A2/15)
Continuity


Short circuit
(inner shielding)



Radio: OFF
Disconnect antenna cable (a) between A2/15 and A2/16.

< 10




Wiring.
4.0 Radio (A2)
Voltage supply
W0


A2/16
b
Radio: OFF
Disconnect antenna cable (a) from A2/16.
Radio : ON

11 - 14 V



Wiring,
A2 (see 3.1 23 ).
5.0 Rear window AM antenna amplifier (A2/16) and bumper FM antenna amplifier (A2/15)
Total current draw
A2/16

A2
Connect ampmeter between A2/16 and control wire (c) from radio.
Radio: ON

52 - 72 mA


5.1

If nominal value is okay, but reception quality is poor:
AM band
Replace A2/16 and perform 11 . If no improvement, replace rear window antenna.
FM band
7.0
5.1 Rear window AM antenna amplifier (A2/16)
Current draw
A2/16

A2
Connect ampmeter between A2/16 and control wire (c) from radio.
Disconnect antenna cable (a) from A2/16.
Radio: ON

15 - 25 mA


6.0 ,
A2/16,
If nominal value is okay: 5.2
5.2 Bumper FM antenna amplifier (A2/15)
Current draw
A2/16

A2/16
Connect ampmeter between A2/16 and antenna cable (a) from A2/15.
Radio: ON

Note:
Voltage is supplied via the inner cable of RF cable.

37 - 47 mA


6.0 ,
A2/15

6.0 Ground







A2/15

A2/16
Radio : OFF
Note:
Do not loosen mounting connection on A2/15 or A2/16. Mounting connection also serves as ground.

< 1


Contact resistance at ground.
7.0 Antenna cable
Bumper antenna










Measure between connection on bumper (at solder connection) and pin on A2/15.

< 1


If nominal value is okay, replace A2/15 and perform 11 . If no improvement, replace rear bumper antenna.