No radio for 30 seconds on cold start

Have you noticed any problem with the MFD, coincident with the slow start on the audio system?

 

are you losing your stored radio presets?
is there an audible beep when this happens?
is there anything in the cd changer when this happens?
is the prius writing any new codes in the mfd diagnostic screen that could point at a problem?
is your 12 v battery weak?

 

Weird. Usually a memory loss is due to the temporary loss of 12V power, which could mean the 12V battery is weak. At the time when you lost the NAV locations, did your fuel gauge also lose its reading of how much fuel the car had?

 

Well anyway, back to your reported radio problem. If you can demonstrate that slow start to the service writer, then it would be reasonable to ask for your stereo to be replaced under the 3 year/36K mile warranty.

 

if there is any kind of issue with the radio you would need to go to the diagnostic screen and post the log... u can search for magic buttons or something to find it. you basically turn the car on, press display, and tap the left top and left bottom area 3 times each, and then you check lan monitor, and check each of the catagories, and all the error codes are there. so theres nothing else installed like add ons? this is a weird one. if there was a problem with the radio with power you would lose your presets. errors across the avnet/bean could also make you lose presets.

does it say "RADIO OFF" and then you have to drive for a bit for the radio on? that might be a stuck key, i suppose...

i wouldn't worry about it. i would just take it under warranty and have the radio swapped out.

changing out the mfd would be covered too, if it was necessary but that would be a last resort cause it holds your telephone book

 

(assuming you turned it off with the radio on)

turn on car
hit audio on mfd (like if u wanted to switch from fuel consumption to audio)
what do you see
radio off?

does pressing the mode button on the steering wheel before the radio turns on help? does it
let you go to anything else like the cd player?

 

Well, a radio problem is most likely limited to the radio assembly, the MFD, or the 12VDC power supply. It appears that the 12V bus is OK since all other systems are working as normal. It also appears that the MFD is responding normally to your input.

Hence, I think it is likely that the radio itself is the problem. You ask why the problem is limited to situations where the car has not been driven for several hours. Maybe there is an intermittent connection that opens up when the radio assembly is cold, but the connection is restored after the radio is powered up for a while. Who knows...

 

prius has multiple local area networks.. im trying to to see if its something simple as a stuck button, bad power, and curious if the mfd holds any errors for this device.

patrick -
the prius relies heavily on the interconnectivity of devices across its lan, and you can have problems with your cd changer that will affect the radio, and problems with the radio or amp that affect the cd changer.. its bizarre.

 

Hey, this sounds familiar. It happens to me just about every day but the delay varies from 5 to maybe 20 or 30 seconds with no particular pattern. Thing is, I have been blaming it on my XM radio since I am used to it being a little slow to find the signal when I first start the car. (Delphi Roady XT.) I never thought to blame it on the car itself, so now I have to investigate!

 

weird..

and you don't have anything else added? like a satellite radio? lock pick?

all you can do is take it to the dealer. all i can do now is wait for you to post the contents of the error codes in lan monitor and look them up, and then tell you what they mean, with a message of what they mean you would be better prepared on your trip to the dealer...

2007 Prius - Easter Egg

click service check
click lan monitor
post codes for emv, audio, g/w and dsp-amp

if it says NoErr its fine, if it says chek, post codes

hold display on the mfd to exit or turn the car off

dont do anything else, it might screw up the car

whenever the car logs an error in the mfd, it will give an actual beep, but its all stealthy otherwise and you won't know it actually logged anything. so im not expecting a lot of information to be logged

 

I experimented today and determined that it's not the car's fault in my case. If I switch from AUX to any other input during "radio silence" I get a signal. Switch back to the XM radio and it's still quiet until it decides it's done finding the signal / buffering / whatever else.