Bosch AIVIH61L2 Manual page 180

8. Troubleshooting guide
Symptom
When a cellular phone is operated to
make a call, the hands-free function
becomes unavailable.
The other party's voice cannot be heard.
There is no ringtone.
Each volume level (ringtone, incoming
voice or outgoing voice) is different.
The antenna display is different between
the touch screen display and a cellular
phone screen. Making or receiving a call
is unavailable even though the antenna
display shows that it is possible to do so.
A voice cannot be heard clearly when
using a cellular phone behind tall build-
ings.
Noise is heard when using a cellular
phone under/near areas of elevated
railroads, high voltage electric power
cables, traffic signals, neon billboards,
etc.
Noise is heard in the sound from the
audio system while using a cellular
phone.
Sound skips or stutters.
8-12
Condition:
Possible cause
Some models of a cellular phone do not
switch to the hands-free mode when they are
operated to make a call.
The volume level is set to the minimum.
A cellular phone is not connected.
Each volume level is not adjusted properly.
The antenna display varies depending on the
model of cellular phone.
Some structures such as tall buildings, etc.
may cause irregular reflection of radio waves
or completely shut out radio waves that are
used for cellular phones.
Electromagnetic waves that are generated
from radio devices may adversely affect the
cellular phone.
Radio waves that are generated from a
cellular phone may adversely affect the
sound from the audio system.
The cellular phone may have turned on the
wireless LAN (Wi-Fi).
[ Edit: 2019/ 9/ 13 Model: 2020MY AIVI ST3 OM_N20E-AV1NJU0_NAVIOM19-022 ]
(182,1)
Possible solution
This is not a malfunction. Make another call using
the hands-free function.
Adjust the volume level.
Check the registration procedure, and then regis-
ter the cellular phone again.
Adjust each volume level properly.
This does not indicate a malfunction. The antenna
display and remaining battery level shown on the
touch screen display may be different from those
shown on the cellular phone screen. Use them as a
reference.
Move to a place without tall buildings.
This is not a malfunction.
This is not a malfunction.
Turn off the wireless LAN (Wi-Fi).