Inspection Procedure 8

INSPECTION PROCEDURE 8: Noise: Broadcasts can be Heard but Both AM and FM Have a lot of Noise.

DIAGNOSIS

STEP 1. Check the state of the antenna.

Q: Is the mast antenna assembled?

YES: Go to Step 2.
NO: Assemble the mast antenna. Check to see that the noise is gone.

STEP 2. Check 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?

When the engine is stopped : Go to Step 3.
When the engine is running: Check the vehicle's noise suppressor.

STEP 3. Check 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?

YES: Consult the radio manufacturer's service center.
NO: Go to Step 4.

STEP 4. Check that the radio is correctly grounded.
The radio is connected to the ground with an assembling screw.

Q: Is the radio correctly grounded?

YES: Go to Step 5.
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?

YES: Go to Step 7.
NO: Go to Step 6.

STEP 6. Check that the noise is eliminated when the antenna plug is properly attached.

Q: Is the noise eliminated?

YES: Consult the radio manufacturer's service center.
NO: Go to Step 7.

STEP 7. Check that the antenna is in good condition and is it properly mounted.

Q: Is the antenna in good condition and is it properly mounted?

YES: Consult the radio manufacturer's service center.
NO: Either repair or replace the antenna assembly. Check to see that the noise is gone.