MFD Reboots?

phoenix101 · 07-06-2009, 06:03 AM

I have a 2006 Touring and have recently noticed that if the car is in ACC mode (one push of the power button without brake), and I switch on the driving beams the MFD goes blank, the radio turns off and the MFD displays the start-up screen and then returns to normal operation. Has anyone else experienced this?

**TonyPSchaefer** · 07-06-2009, 08:59 AM

Hi Phoenix.
I'm not sure that I understand the order:
1) Push (POWER) once to get into ACC mode.
2) Switch the headlights on (?).
3) The MFD goes blank, the radio turns off.
4) The MFD displays the start-up screen.

Does the radio come back on?
Have you fully powered up the car or are you still in ACC?

I just want to make sure I fully understand the situation before I offer up a guess.

patsparks · 07-06-2009, 10:15 AM

Sounds like it could be a bad 12 volt battery and about the right age car. Of course I'm just guessing.

EZW1 · 07-06-2009, 10:22 AM

I agree. From the time you push the power button (makes no difference if you go to ACC or IGN mode), up until the time the inverter comes online and begins to recharge the 12V battery, there's a heavy load on the 12V system as all the computer systems come up. With a healthy battery, I've noticed a 0.5 to 0.7 volt drop during this time. If you have a marginal or tired battery, the drop could easily exceed 1.0 to 1.5V.

richard schumacher · 07-06-2009, 10:28 AM

What they wrote: quite likely the 12V battery is near the end of its life. Measure its voltage at the jump point under the hood, or use the self-test procedure:
Checking 12v Battery Health - Hybrid Car Forums

phoenix101 · 07-07-2009, 12:41 AM

Thanks for the advice guys, I will have the 12v tested and let you know.

phoenix101 · 07-08-2009, 02:01 AM

Had it tested, and its a dead 12v battery, I'll have to replace it. thanks again.

bredekamp · 07-08-2009, 11:41 AM

Quote:

Originally Posted by phoenix101

Had it tested, and its a dead 12v battery, I'll have to replace it. thanks again.

Did the fix work?

Sandy · 07-08-2009, 12:31 PM

works?

phoenix101 · 07-09-2009, 01:16 AM

Quote:

Originally Posted by bredekamp

Did the fix work?

I have ordered the 12v battery, but there isn't any stock available in the country, I'll have to wait a while.

07-06-2009, 06:03 AM	#1
phoenix101 Junior Member Join Date: Feb 2009 Location: South Africa Posts: 9 My Car: 2010 Prius Model: V Package: Navigation Thanks: 0 Thanked 0 Times in 0 Posts Friends: 1	MFD Reboots? I have a 2006 Touring and have recently noticed that if the car is in ACC mode (one push of the power button without brake), and I switch on the driving beams the MFD goes blank, the radio turns off and the MFD displays the start-up screen and then returns to normal operation. Has anyone else experienced this?

07-06-2009, 08:59 AM	#2
TonyPSchaefer Your Friendly Moderator Join Date: May 2004 Location: Far-North Chicagoland Posts: 13,920 My Car: 2004 Prius Model: Package: #9 Thanks: 251 Thanked 1,217 Times in 625 Posts Friends: 33	Re: MFD Reboots? Hi Phoenix. I'm not sure that I understand the order: 1) Push (POWER) once to get into ACC mode. 2) Switch the headlights on (?). 3) The MFD goes blank, the radio turns off. 4) The MFD displays the start-up screen. Does the radio come back on? Have you fully powered up the car or are you still in ACC? I just want to make sure I fully understand the situation before I offer up a guess.

07-06-2009, 10:15 AM	#3
patsparks An Aussie perspective Join Date: Jul 2007 Location: Adelaide South Australia Posts: 10,558 My Car: 2004 Prius Model: N/A Package: Base Thanks: 265 Thanked 430 Times in 326 Posts Friends: 36	Re: MFD Reboots? Sounds like it could be a bad 12 volt battery and about the right age car. Of course I'm just guessing.

07-06-2009, 10:22 AM	#4
EZW1 Senior Member Join Date: Aug 2008 Location: Phoenix, AZ Posts: 626 My Car: 2009 Prius Model: N/A Package: #5 Thanks: 0 Thanked 33 Times in 27 Posts Friends: 1	Re: MFD Reboots? I agree. From the time you push the power button (makes no difference if you go to ACC or IGN mode), up until the time the inverter comes online and begins to recharge the 12V battery, there's a heavy load on the 12V system as all the computer systems come up. With a healthy battery, I've noticed a 0.5 to 0.7 volt drop during this time. If you have a marginal or tired battery, the drop could easily exceed 1.0 to 1.5V.

07-06-2009, 10:28 AM	#5
richard schumacher shortbus driver Join Date: Mar 2004 Location: United States Posts: 7,379 My Car: 2004 Prius Model: N/A Package: #6 Thanks: 583 Thanked 758 Times in 306 Posts Friends: 0	Re: MFD Reboots? What they wrote: quite likely the 12V battery is near the end of its life. Measure its voltage at the jump point under the hood, or use the self-test procedure: Checking 12v Battery Health - Hybrid Car Forums Last edited by richard schumacher; 07-07-2009 at 10:20 AM.

07-07-2009, 12:41 AM	#6
phoenix101 Junior Member Join Date: Feb 2009 Location: South Africa Posts: 9 My Car: 2010 Prius Model: V Package: Navigation Thanks: 0 Thanked 0 Times in 0 Posts Friends: 1	Re: MFD Reboots? Thanks for the advice guys, I will have the 12v tested and let you know.

07-08-2009, 02:01 AM	#7
phoenix101 Junior Member Join Date: Feb 2009 Location: South Africa Posts: 9 My Car: 2010 Prius Model: V Package: Navigation Thanks: 0 Thanked 0 Times in 0 Posts Friends: 1	Re: MFD Reboots? Had it tested, and its a dead 12v battery, I'll have to replace it. thanks again.

07-08-2009, 12:31 PM	#9
Sandy Hippi Chick Join Date: Apr 2009 Location: Ocala,Fl Posts: 860 My Car: Other Non-Hybrid Model: N/A Package: N/A Thanks: 83 Thanked 53 Times in 43 Posts Friends: 11	Re: MFD Reboots? works?

LinkBacks (?) LinkBack to this Thread: http://priuschat.com/forums/gen-ii-prius-technical-discussion/64781-mfd-reboots.html
Posted By	For	Type	Date
Checking 12v Battery Health - Page 2 - Hybrid Car Forums	This thread	Refback	10-28-2011 08:11 AM
Checking 12v Battery Health - Hybrid Car Forums	This thread	Refback	08-17-2011 08:53 PM
Checking 12v Battery Health - Hybrid Car Forums	This thread	Refback	05-18-2010 02:25 PM

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