Santa Fe L4-2.4L (2001)
Cellular Phone: Technical Service Bulletins
Audio System - Clicking Noise From Speakers
Group: BODY ELECTRICAL
Number: 03-90-001
Date: FEBRUARY, 2003
Model: ALL
Subject
CLICKING NOISE FROM RADIO SPEAKERS
CAUSED BY WIRELESS TELEPHONE
RADIO FREQUENCY INTERFERENCE
DESCRIPTION:
Some vehicles may experience an intermittent, faint clicking sound from the radio speakers. The noise may be described as either a clicking or popping
sound from the dash area. This sound may be caused by radio frequency (RF) signals emitted by the vehicle occupant is wireless phone.
Wireless telephones are hand-held phones with built-in antennas, often called cell, mobile or PCS phones. Wireless telephones are two-way radios.
When a person speaks into a wireless telephone, it picks up the person's voice and converts the sound to radio frequency energy (or radio waves). The
radio waves travel through the air until they reach a receiver at a nearby base station. The base station then sends the call through the telephone network
until it reaches the person you are calling.
When a person receives a call on his/her wireless telephone, the message travels through the telephone network until it reaches a base station close to
his/her wireless phone. Then the base station sends out radio waves that are detected by a receiver in his/her telephone, where the signals are changed
back into the sound of a voice.
Radio frequency energy from wireless phones can be picked up by electronic devices in the car such as:
^
Radio Receiver
^
Radio speakers
^
External amplifiers (if equipped)
Some wireless telephone providers require the phone to check into nearby base stations periodically for voice mail messages and reception signals. In
addition, it informs the cell site if the phone is in range.
The occupant may hear a clicking noise from the speakers when the following occurs:
^
The occupant is making a call
^
The occupant receives a call
^
The wireless phone is checking into a nearby base station
^
The wireless phone changes cell sites
Hyundai radios are designed to comply with Federal Communication Commission (FCC) rules, which state operation is subject to the following
