this never happened before....and not sure if I did anything that started the problem. Basically whenever I start the car my headunit is losing all its memory, as if the battery has been disconnected. ie radio presents, clock etc etc. anyone with ideas?

 

Loose wiring? Stock or after-market HU?

Check all of your wires.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sticky Tires &raquo;</TD></TR><TR><TD CLASS="quote">Loose wiring? Stock or after-market HU?

Check all of your wires.</TD></TR></TABLE>

I agree. I would also change the fuse for the stereo/clock while you are at it just to rule that out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AndyD &raquo;</TD></TR><TR><TD CLASS="quote">I agree. I would also change the fuse for the stereo/clock while you are at it just to rule that out.</TD></TR></TABLE>

I thought about the fuse and came back to post about it but got beat by you. I guess great minds do think alike.

 

Yeah, check fuses and check the the +12v (not acc) wire on the back of the head unit.

 

ya check the fuse

 

If it loses memory - you DON'T have a ground........you need to ground the headunit - and it will never happen again - trust me.

 

dude..if you didnt have a ground then the head unit wouldnt turn on at all. and obviously it turns on so it means you have a good ground.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iCe_2x &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, check fuses and check the the +12v (not acc) wire on the back of the head unit.</TD></TR></TABLE>

i agree with iCe_2x. On the back of the head unit there are two +12 volt power wires (red and yellow; i think). One supplies a constant +12 volts to the headunit and the other wire supplies an acc. +12 volts (when the key is in 1st position). The constant 12+ wire is what keeps the settings in the head unit so i would check that wire connection first.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jos3ph &raquo;</TD></TR><TR><TD CLASS="quote">

i agree with iCe_2x. On the back of the head unit there are two +12 volt power wires (red and yellow; i think). One supplies a constant +12 volts to the headunit and the other wire supplies an acc. +12 volts (when the key is in 1st position). The constant 12+ wire is what keeps the settings in the head unit so i would check that wire connection first. </TD></TR></TABLE>

 

thanks! will check the power wires then, it must be that because....one of my power wires were torn/cut I had connected the wires together using connection block (ddnt have soldering iron at hand) to get the headunit to turn on again. so maybe its that connection which is giving problem.... but then if there is no connection the headunit wouldnt turn on right? is it best changing the fuse first since this is less hassle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pez1 &raquo;</TD></TR><TR><TD CLASS="quote">but then if there is no connection the headunit wouldnt turn on right? </TD></TR></TABLE>
hmm...that's a good question. i would think that the +12v acc. wire would provide the power to turn on the headunit. If the fuse was bad, i believe your radio wouldn't have turned on. since your radio does turn on i think the fuse isn't the problem but you should check it anyways. oh, i believe there is one way to check if it's your +12v constant wire. On my cd headunit, i can still put-in and eject cds as well as check the time on the headunit, while the car is off and keys not in the socket. That's that 12+ constant wire that's supplying the power for me to be able to that. If you can do the same, then it's not your +12v constant wire, but if you can't, then most likely it is. hope that makes sense.

 

I believe there are two grounds - one is pink, and the other is black - not sure about the color.

I had the same problem in my other vehicle - I hooked up the radio to the ignition (since i had an electrical problem) - but I didnt' ground it - so, i would have to preset the stations everytime i turned on the car..........

That was an older car though - i know some cars have a constant power, and a 12v switch.............maybe you don't have the constant power connected properly - or you have the two switched. In that case, it won't hold memory.

 

King pin sounds right...

We still dont know if the HU is aftermarket or not...

The only thing we know for sure is constant power is not working properly...

Most likely cause since the HU powers on, both power wires are connected to the Accessory wire....


The antenna is a ground and as long as thats connected you have ground... Its not the best idea to use it as a main ground, but Nissan does... So, you can rule that out... Honda and aftermarket radios both incorporate a ground into the wiring....


What happened to the good old days of requiring the poster wanting help to give good descriptions and not making us guess?

 

what the hell you guys the problem is more than obvious that its the constant positive (more than likely yellow) otherwise know as memory!!!!!!!!!!!!

 

sorry for vague descriptions, oops! anyway, it is aftermarket headunit, and used to keep its memory when i first fitted it, but while removing the original headunit, I found the new one wasn't turning on, the source of this problem being one of the power wires had snapped (can't remember which). made the connection again as explained using connection block, it worked fine. Then later i'm getting 2 problems.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jos3ph &raquo;</TD></TR><TR><TD CLASS="quote">
hmm...that's a good question. i would think that the +12v acc. wire would provide the power to turn on the headunit. If the fuse was bad, i believe your radio wouldn't have turned on. since your radio does turn on i think the fuse isn't the problem but you should check it anyways. oh, i believe there is one way to check if it's your +12v constant wire. On my cd headunit, i can still put-in and eject cds as well as check the time on the headunit, while the car is off and keys not in the socket. That's that 12+ constant wire that's supplying the power for me to be able to that. If you can do the same, then it's not your +12v constant wire, but if you can't, then most likely it is. hope that makes sense. </TD></TR></TABLE>

The memory is lost AND yes Jos3ph, i'm having the same problem, It is an electrical flip down Sony MD player, and the front panel no longer flips down when car ignition is off, no clock nothing, so you are right, it must be the +12V constant wire?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JTCdudeman &raquo;</TD></TR><TR><TD CLASS="quote">

Most likely cause since the HU powers on, both power wires are connected to the Accessory wire....

</TD></TR></TABLE>

I don't think both were connected to Acc leaving constant unconnected, since the memory used to work fine, so probably something just gone wrong with the 1 connection? I will check the red & yellow? wires then. thanks guys!

 

If it used to work and it doesn't, you either a) blew the fluse, b) loosened the wire with your mad tyte jdm driving.

If the fuses are fine, and the wire connection is fine, test the wire for power with a 12v tester. If its fine, the unit may be damaged.

And finally, if the ground wasn't connected, they unit would not power on at all. I don't think there is a ground for acc and a ground for constant 12v.