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RADIO AND CD PLAYER CHASSIS ELECTRICAL 54A-279 Inspection Procedure 5: Noise appears at certain places when travelling. DIAGNOSIS PROCEDURE STEP 1. Check the noise occur when entering or Q: Does the noise occur when entering or near a particular structure (building, tunnel, mountain, Go to Step 3. NO : Go to Step 2. STEP 2. After taking the following measures to to boost resistance to interference. (2) Suppress high tones to reduce noise. Q: Do the following measures eliminate the noise? YES : This diagnosis is complete. NO : Go to Step 4. STEP 3. Ask the owner about the state of the • Place where the noise occurs. • Locality conditions (valley, mountain, etc). • Name and frequency of stations affected by noise Q: Which is the noise, vehicle noise or external noise? It may not be possible to prevent noise if the signal is weak. This diagnosis is External noise : In almost all cases, prevention on the receiver side is impossible. Weak STEP 4. Check that there is no noise. Q: Does noise still exist? YES : If there is more noise than on radios in other vehicles, find out the noise condition and NO : Normal. Inspection Procedure 6: Mixed with noise, only at night. The following factors can be considered as possible that long-distance signals are more easily 2. Factors due to vehicles noise: Alternator noise may be a cause. DIAGNOSIS PROCEDURE STEP 1. Check that the noise still obvious even Q: Is the noise still obvious even when the lamps are off? Go to Step 2. NO : Go to Step 3. Step 2. Check hat the following actions. Q: Is there more noise than on radio in other vehicles? Consult the radio manufacturer's service centre. NO : This diagnosis is complete. |