Inspection Procedure 4: The radio broadcasting can not be received. <Analog radio>


caution Before replacing the multivision display, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
In case of AM/FM/LW radio broadcasting cannot be received, antenna rod, antenna base, antenna feeder or multivision display may have a problem.
note The radio wave may not be received if the vehicle is placed in the area which is exposed to a special electric field. Thus, check that the radio broadcasting can be received using the radio of another vehicle before carrying out diagnosis.

PROBABLE CAUSES

  • Malfunction of antenna rod
  • Malfunction of antenna base
  • Malfunction of antenna feeder
  • Malfunction of multivision display

DIAGNOSIS PROCEDURE

STEP 1. Check the state of the antenna rod and antenna base.

Q. Is the antenna assembled?
Go to Step 2
Assemble antenna rod and antenna base.

STEP 2. Check to see if inspections are taking place is an area exposed to special electric fields.

Q. Is the reception area exposed to special electric fields?
Go to Step 3
Go to Step 4

STEP 3. Move the vehicle and check the radio.
Move the vehicle to a good reception area that is not exposed to special electric fields.

Q. Is the check result normal?
Diagnosis complete.
Go to Step 4

STEP 4. Check if there is any damage to the antenna rod, antenna base and antenna feeder.

Q. Is the check result normal?
Go to Step 5
Replace the antenna rod, antenna base and antenna feeder.

STEP 5. Check the connection of the antenna feeder’s plug and multivision display.

Q. Is the antenna feeder’s plug thoroughly connected to the multivision display?
Go to Step 6
Thoroughly connect the antenna feeder’s plug and the multivision display.

STEP 6. Connector check: C-104 multivision display connector, C-107 antenna amplifier connector

Q. Is the check result normal?
Go to Step 7.
Repair the connector concerned.

STEP 7. Check the wiring harness between C-104 multivision display connector terminal No.34 and C-107 antenna amplifier connector No.1

  • Check the communication line for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. Substitute a known good multivision display, and check the trouble symptom.

Q. Is the check result normal?
Replace the multivision display.
Either repair or replace the antenna rod and antenna base.