14 - Inspection Procedure
Poor ReceptionDIAGNOSIS
STEP 1. Make sure that the check being conducted under special electrical field conditions.
Q: Is the check being conducted under special electrical field conditions (such as in an underground garage or inside a building?
YES: Go to Step 2.
NO: Go to Step 3.
STEP 2. Check that proper performance is obtained when the vehicle is moved.
Q: Is proper performance obtained when the vehicle is moved?
YES: Check that a poor reception is resolved.
NO: Go to Step 3.
STEP 3. Check that tuning solves the problem.
Q: Does tuning solve the problem?
YES: Check that a poor reception is resolved.
NO: Go to Step 4.
STEP 4. Check that the problem is limited to the reception of a specific radio station from a specific position.
NOTE: Multipath noise and fading noise: Because the frequency of FM waves is extremely high, it is highly susceptible to effects from geological formations and buildings. These effects disrupt the broadcast signal and obstruct reception in several ways.
- Multipath noise
This describes the echo that occurs when the broadcast signal is reflected by a large obstruction and enters the receiver with a slight time delay relative to the direct signal (repetitious buzzing).
- Fading noise
This is a buzzing noise that occurs when the broadcast beam is disrupted by obstructing objects and the signal strength fluctuates intricately within a narrow range.
Q: Is the problem limited to the reception of a specific radio station from a specific position?
YES: Go to Step 5.
NO: Check that a poor reception is resolved.
STEP 5. Check that the antenna plug is connected to the radio properly.
Q: Is the antenna plug connected to the radio properly?
YES: Go to Step 6.
NO: Reconnect the antenna plug and radio unit properly. Check that a poor reception is resolved.
STEP 6. Check that the problem disappear when another radio is used?
Q: Does the problem disappear if another radio is used?
YES: Repair or replace the radio. Check that a poor reception is resolved.