Inspection Procedure 12

INSPECTION PROCEDURE 12: 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 13). Inspection Procedure 13

STEP 2. Verify that the following actions disappear the noise.

1. Tune to a station with a stronger wave.
2. 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 3.

STEP 3. Verify that the radio is correctly grounded

Q: Is the radio correctly grounded?

YES : Go to Step 4.

NO : Consult the radio manufacturer's service center.

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)

Q: Is the antenna in good condition?

YES : Inspection complete.

NO : Clean or repair it. Check the noise is eliminated. If the noise is not eliminated, consult the radio manufacturer's service center.