NO.1 NO RADIO RECEPTION (AM/FM)/NO OR LOW VOLUME [RADIO]

id0903e3804300

1

No radio reception (AM/FM)/no or low volume

Possible DTC

With M-MDS

U3003:16

Without M-MDS
Audio unit
•  09:Er20
Car-navigation unit
•  Device code 09/Error code 20
POSSIBLECAUSE
•  Jamming from aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc.)
•  Electronic jamming from outside, or inferior condition of broadcasting station radio wave
•  Antenna plug poor connection
•  Antenna feeder malfunction
•  Audio unit malfunction (with audio system)
•  Car-navigation unit malfunction (with car-navigation system)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Turn the audio unit ON.
•  Is the LCD indicated correctly?
Yes
Go to Step 3.
No
Go to the next step.
2
•  Measure voltage at B+ and ACC terminals.
•  Is voltage okay?
Specification
Switch the ignition to ON.: 11.5 V or more
At idling: 12.5 V or more
Yes
Go to the next step.
No
Follow diagnostic procedure for symptom No. 2 (Entire audio system).
(See NO.2 NO POWER TO THE ENTIRE AUDIO SYSTEM [ENTIRE AUDIO SYSTEM].)
3
•  Set volume to 20 to 30.
•  Is buzzing sound or voice confirmed?
Yes
Go to the next step.
No
Follow diagnostic procedure for symptom No. 3 (Entire audio system) or No. 4 (Entire audio system).
(See NO.3 NO SOUND FROM ALL SPEAKERS [ENTIRE AUDIO SYSTEM].)
(See NO.4 NO SOUND FROM SOME SPEAKERS [ENTIRE AUDIO SYSTEM].)
4
•  Tune to local broadcasting station and check reception condition.
•  Is reception okay?
Yes
Go to the next step.
No
Go to Step 6.
5
•  Push preset switches and check preset conditions.
•  Has preset been stored?
Yes
The system is normal.
No
Preset broadcasting stations.
6
•  Is aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc.) installed?
Note
•  TV antenna located closely to audio antenna can be cause of noise. Relocate TV antenna.
Yes
Go to the next step.
No
Go to Step 8.
7
•  Remove aftermarket electronic equipment.
•  Turn audio unit ON and check reception condition.
•  Is reception improved?
Yes
The system is normal.
(Explain to customers that aftermarket electronic equipment is cause of noise)
No
Go to the next step.
8
•  Refer to confirmation step 3, and inspect antenna system.
•  Is a whirring sound present?
Yes
Replace audio unit.
No
Go to the next step.
9
•  Inspect antenna plug connection condition.
•  Is connection okay?
Yes
Go to the next step.
No
Insert antenna plug securely.
10
•  Switch the ignition to off.
•  Measure continuity between antenna feeder axis and ground.
•  Is there any continuity?
Yes
Replace antenna feeder.
No
4SD
•  Go to the next step.
5HB/WGN
•  Replace the antenna amplifier, than go to the next step.
11
•  Compare reception with other audio unit on same model (model/unit) under same problem conditions.
•  Is reception equivalent between customer’s unit and compared unit?
Note
•  Due to following differences, you may feel difference in reception efficiency.
(Vehicle side factor)
―  Antenna installation location, height, feeder wiring routing, optional electrical equipment
(Audio unit/car-navigation unit factor)
―  Volume concern type: It decreases change of volume when signals become weak. (Noise is conspicuous)
―  Noise decrease type: It decreases volume when signals become weak, so that noise is not conspicuous.
Yes
The system is normal.
(It is caused by electronic jamming from outside, or inferior broadcasting station signal condition.)
No
Replace the audio unit (with audio system).
(See: AUDIO UNIT REMOVAL/INSTALLATION.)
Replace the car-navigation unit (with car-navigation system).
(See: CAR-NAVIGATION UNIT REMOVAL/INSTALLATION.)