Inspection Procedure 11

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?

YES : Go to Step 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?

When the engine is stopped : Go to Step 3.

When the engine is running : Check the vehicle's noise suppressor. Inspection Procedure 13

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?

YES : Consult the radio manufacturer's service center.

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?

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. Verify 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. 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?

YES : Consult the radio manufacturer's service center.

NO : Either repair or replace the antenna assembly. Check to see that the noise is gone.