No.4 Noise From Radio (Fm Only) [Radio]: Notes

4	Noise from radio (FM only)
Possible DTC	Using the M-MDS	U3000:09
Possible DTC	Without using M-MDS (On-board diagnostic test mode)	09:Er21
Possible cause	Antenna rod not installed Jamming from aftermarket electronic equipment (two-way radio, navigation system, mobile phone, etc.) Battery malfunction Noise from electrical system on vehicle (e.g. fuel pump) Charging system malfunction Electronic jamming from outside, or inferior condition of broadcasting station radio wave Antenna feeder poor connection Antenna feeder malfunction Antenna installation loosened Audio unit malfunction NOTE: FM broadcast has feature "sound quality is good" and "resistant to noise", but FM broadcast has particular noises. Though audio unit is designed to reduce noise, there are times noise occurs due to conditions.