Inspection Procedure
3: The radio broadcasting can not be received. <Digital radio (vehicles with DAB tuner)>
caution
Before replacing the radio
and CD player, ensure that the power supply circuit, the earth circuit and the communication
circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
In case of digital radio broadcasting cannot be received, digital audio broadcast (DAB)
tuner, antenna rod, antenna base, antenna feeder or radio and CD player may have a problem.
PROBABLE CAUSES
Malfunction of DAB tuner
Malfunction of antenna rod
Malfunction of antenna base
Malfunction of antenna feeder
Malfunction of radio and CD player
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Confirmation in display audio service mode.
(1)Display the "External Device Connection Check" screen (Refer to ).
(2)Check that "DAB" is "OK."
Q.
Is the check result normal?
Go to Step 7.
Go to Step 2.
STEP 2. Voltage measurement at DAB tuner connector (+B terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Check the voltage between the DAB tuner connector (+B terminal) and body
earth. OK: System voltage
Q.
Is the check result normal?
Go to Step 4.
Go to Step 3.
STEP 3. Check of short to power supply, short to earth, and open circuit
in +B line between DAB tuner connector and fusible link <vehicles without AS&G
system> or DC/DC converter <vehicles with AS&G system>
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
Repair the connector(s) or wiring harness.
STEP 4. Resistance measurement at DAB tuner connector (GND terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Check the continuity between the DAB tuner connector (GND terminal) and body earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 6.
Go to Step 5.
STEP 5. Check of open circuit in GND line between DAB tuner connector
and body earth
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
Repair the connector(s) or wiring harness.
STEP 6. Check of short or open circuit in TIL+, TIL-, TIR+, TIR-,
TSHG, ACC, IEH, IEL line between DAB tuner connector and radio and CD player connector
Q.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
STEP 7. Check the state of the antenna rod and antenna base.
Q.
Is the antenna assembled?
Go to Step 8.
Assemble antenna rod and antenna base.
STEP 8. Check if there is any damage to the antenna rod, antenna base
and antenna feeder.
Q.
Is the check result normal?
Go to Step 9.
Replace the antenna rod, antenna base and antenna feeder.
STEP 9. Check the connection of the antenna feeder’s plug and
DAB tuner.
Q.
Is the antenna feeder’s plug thoroughly connected to the DAB tuner?
Go to Step 10.
Thoroughly connect the antenna feeder’s plug and the DAB tuner.
STEP 10. Substitute a known good radio and CD player, and check the
trouble symptom.