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

id0903e3804300

1 | No radio reception (AM/FM)/no or low volume)
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Possible DTC | Using the M-MDS | U3000:09, U3003:16
Without using M-MDS (On-board diagnostic test mode) | 09:Er21, 09:Er20
Possible cause | • Low vehicle battery voltage • Electronic jamming from outside, or inferior condition of broadcasting station radio wave • Jamming from aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc.) • Antenna plug poor connection • Antenna feeder malfunction • Audio unit malfunction • Antenna rod not installed

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | • Turn the audio system to 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 With ignition switch 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 (AUDIO).
3 | • Set volume to 10 to 15. • Is buzzing sound or voice confirmed? | Yes | Go to the next step.
No | Follow diagnostic procedure for symptom No. 3 (AUDIO) or No. 4 (AUDIO).
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 the audio system to 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. (See AUDIO UNIT REMOVAL/INSTALLATION.)
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 | • Turn ignition switch to OFF position. • Measure continuity between antenna feeder axis and ground. • Is there any continuity? | Yes | Replace antenna feeder.
No | 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 factor) ― Volume concern type: It decreases change of volume when signals become weak. (Noise is easily noticed) ― Noise decrease type: It decreases volume when signals become weak, so that noise is not noticeable. | Yes | The system is normal. (It is caused by electronic jamming from outside, or inferior broadcasting station signal condition.)
No | Replace audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)