Page 406 - Workshop Manual - Aumark (BJ1051)

04-262
Diagnosis-audio system

Basic checks

Step Check item Measure
1 Y Go to step 2.
Checking battery voltage
• Battery voltage should not be below 21V. N Charge the battery or replace. Refer to
Is check result normal?
“Chapter 53 Battery-Battery”.

2 Checking antenna Y Go to step 3.
• For extension to its maximum length. N Repair or replace antenna. Refer to
• For covering of foreign materials. “Chapter 56 Audio System-Antenna”.
4 • For bending and deformation.
Are check results normal?
3 Checking audio unit Y Go to step 4.

• Depress power switch of sound system and N Go to malfunction symptoms table.
check LCD screen for display.
Is check result normal?

4 Checking audio unit Y Go to step 5.
• Turn up to above 5 VOL and check if speaker N Go to malfunction symptoms table.
makes sounds.
Is check result normal?
5 Radio wave check Y Go to malfunction symptoms table.
• Coverage areas of AM and FM broadcastings
differ greatly. Sometimes, AM broadcasting N Move your vehicle to a place where has
can be received clearly while FM stereo can good signal reception conditions.
not. FM stereo has minimum coverage area and
is susceptible to interference of
electromagnetic wave.
• If your vehicle receives two radio signals from
one and the same transmitting tower at night,
phasing interference will take place. (One
signal is received from the tower directly while
the other is obtained through ionospheric
reflection.)
• Check around your vehicle for tall buildings or
high mountains which will block part of
signals between transmitting towers and your
vehicle.
• Check around your vehicle for large-scale
transformer substations and transmission
stations. Strong electromagnetic waves they
give off will result in broadcast signal
reception failure.
• Some buildings will reflect broadcast signals
due to their materials so that two signals will
be received to produce interference.
Are check results normal?

Page 406