AV
AV
AV
AV
Audio/
Audio/
Audio/
Audio/ Video
Video
Video
Video System
System
System
System
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121
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Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
1.
1.
1.
1. Poor
Poor
Poor
Poor reception
reception
reception
reception of
of
of
of antenna.
antenna.
antenna.
antenna.
Step Operation
Yes
No
1
D oes the reception effect decrease or are there more than one radio stations cannot
be received?
Go to Step 3. Go to Step 2.
2
C heck if there are specific frequencies interfered by the electrical system of vehicle
as per procedures below:
① Turn the ignition switch to ON position.
②
Select the influenced radio station.
③ Remove one fuse each time until the failed one is found out.
④ Perform necessary maintenance for the failed circuit.
Is the maintenance finished?
C heck radio system. —
3
①
Disconnect the negative cable of battery.
②
Disconnect the antenna lead connector from the radio receiver.
③ Measure the resistance between antenna lead connector and battery ground cable.
Is the resistance higher than the specified?
Go to Step 4. Go to Step 5.
4
①
Disconnect the radio antenna lead connector from the windshield.
② Measure the resistance between co-axial cable shielded ground and radio
connector shielded circuit .
Is the resistance higher than the specified?
Go to Step 8. Go to Step 10.
5
Measure the resistance of center conductor ( signal input) between the antenna
connector and the radio connector.
Is the resistance higher than the specified?
Go to Step 7. Go to Step 6.
6
Measure the resistance between center conductor (signal input) and coaxial cable
shielded ground.
Is the resistance lower than the specified?
Go to Step 9. Go to Step 1.1
7
① Check coaxial cable and interconnection for failed connection or corrosion.
② Repair cable and interconnection when necessary.
③
If the cable and interconnection are normal, please replace the coaxial cable of
antenna.
Is the maintenance finished?
Check radio system. —
8
①
Check coaxial cable ground for failed connection or corrosion.
② Repair the ground when necessary.
③ Replace the coaxial cable if the ground is normal.
Is the maintenance finished?
Check radio system. —
9 Replace the affected section of coaxial cable. I f the maintenance finished? Check radio system. —
10
P erform maintenance for the failed connection or corrosion at the coaxial ground
cable.
Is the maintenance finished?
Check radio system. —
11
①
Check coaxial cable connector on the windshield for failed connection or
corrosion.
②
Replace the good radio already known.
③ Replace the windshield if the reception is not improved.
Is the maintenance finished?
Check radio system. —
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