Inspection Procedure 13

INSPECTION PROCEDURE 13: Noise: Noise is overpowering both AM and FM.

DIAGNOSIS

STEP 1. 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 2.
When the engine is running : Check the vehicle's noise suppressor. (Refer to Inspection Procedure 15 Inspection Procedure 15).

STEP 2. Check that the noise fades away by the following actions.

1. Tune to a station with a stronger wave.
2. Adjust the sound quality to suppress high tones.

Q: Is the noise eliminated?

YES : Inspection complete.

NO : Go to Step 3.

STEP 3. Verify that the radio is correctly grounded

Q: Is the radio correctly grounded?

YES : Go to Step 4.

NO : Securely install the radio and CD player or the radio and CD player with CD changer to the vehicle body.

STEP 4. Check the connection of the antenna plug and radio and CD player or radio and CD player with CD changer.

Q: Is the antenna plug thoroughly connected to the radio and CD player or radio and CD player with CD changer?

YES : Go to Step 6.

NO : Go to Step 5.

STEP 5. 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 6.

STEP 6. 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 : Go to Step 7.

STEP 7. Clean the antenna plug and ground wire mounting area. Mount the antenna securely.

NOTE: Noise encountered during FM reception only due to differences in FM and AM system, FM is not as susceptible as AM to interference from engines, power lines, lighting, etc. On the other hand, due to the characteristics of FM waves, there are sometimes cases of noise or distortion which are generated by typical noise interference (first fading and multipath). (Refer to Inspection Procedure 9 Inspection Procedure 9). [Noise (hissing) occurs in weak signal areas such as mountainous regions, but this is not due to a problem with the radio.]

Q: Is the antenna in good condition?

YES : Inspection complete.

NO : Clean or repair it.