INSPECTION PROCEDURE 11: Noise is Overpowering both AM and FM.: Diagnosis

STEP 1. Check the state of the antenna.
Q: Is the mast antenna assembled?
1. YES : Go to Step 2.
2. NO : Assemble the mast antenna. Check to see that the noise is gone.
STEP 2. Verify that the noise occur when the engine is stopped or the engine is running.
Q: Does noise occur when the engine is stopped or the engine is running?
1. When the engine is stopped : Go to Step 3.
2. When the engine is running : Check the vehicle's noise suppressor. (Refer to INSPECTION PROCEDURE 11 ).
STEP 3. Verify that the following actions disappear the noise.
1. Tune to a station with a stronger wave.
2. Extend the antenna completely (Mast antenna).
3. Adjust the sound quality to suppress high tones.
Q: Is the noise eliminated?
1. YES : Consult the radio manufacturer's service center.
2. NO : Go to Step 4.
STEP 4. Verify that the radio is correctly grounded
The radio is connected to the ground with an assembling screw.

Q: Is the radio correctly grounded?
1. YES : Go to Step 5.
2. NO : Consult the radio manufacturer's service center.
STEP 5. Check the connection of the antenna plug and radio and CD player.
Q: Is the antenna plug thoroughly connected to the radio and CD player?
1. YES : Go to Step 7.
2. NO : Go to Step 6.
STEP 6. Verify that the noise is eliminated when the antenna plug is properly attached.
Q: Is the noise eliminated?
1. YES : Consult the radio manufacturer's service center.
2. NO : Go to Step 7.
STEP 7. Verify that the antenna is in good condition and is it properly mounted.
Q: Is the antenna in good condition and is it properly mounted?
1. YES : Consult the radio manufacturer's service center.
2. NO : Either repair or replace the antenna assembly. Check to see that the noise is gone.