Rear fog light technical info!

petteri · 05-30-2004, 03:59 PM

Ok, after much searching of the web and browsing through the Prius service manual (both in German, which I don't know and English) I've got some info to share! To turn on the rear fog lights in an EU Prius you trun the fog light switch to a "third" stop, i.e. one more that what the US Prius had on its switch. This switch connects to the HEADLAMP DIMMER SWITCH ASSY. from what I've found on page 65-5 in the US manual this is connector C7. In this connector are pins numbered 1 - 20. Pins 3-4 are the ones that control the fog lights on a US Prius. However in Europe pin 2 is also used, and that is the pin that I think controls the rear fog lamp., it is not mentioned in the US manual. So in the US if pin 3 and 4 are "off" the front fog lights are OFF if pins 3 and 4 are on the front fog lights are ON. In Europe I think it works as such; if 2, 3 and 4 are off front and rear fogs are OFF if 3 and 4 are on front fogs are ON if 2, 3, and 4 are on the FRONT and REAR fogs are ON. This is what I've gotten from the German service manual which can be found here:

http://www.prius-forum.org

page 65-5 in the US version (from Ebay) is found on the german page 65-20.

So if anyone here can comment of my "major" :wink: discovery and if this means that all I need to do is install the switch and new taillamp and I'm ready to go. I'm hoping the wire from the ECU to the taillamp is the same I don't know how to verify that yet.

Peter
Miami, FL USA

oly_57mpg · 05-02-2005, 02:46 AM

So... Have you tried this yet?

petteri · 05-02-2005, 06:44 AM

No, for a couple of reasons. I've heard a couple of reports of melting tail light assemblies. I live in Miami and while mine haven't shown any evidence of this I'm wary of spending the cash only to have them melt away. I may wait until this is resolved. I'm also saving my money for some of Coastal Dave's stuff. I found a dealer in Finland that would ship me the EU tail lamp assy. so that part of the project wouldn't be a problem.

DonDNH · 05-02-2005, 01:48 PM

LEDs won't generate enough heat to melt. See a wide selection of automotive LEDs here.

Tempus · 05-02-2005, 02:01 PM

Quote:

LEDs won't generate enough heat to melt. See a wide selection of automotive LEDs here.

The 'melting' problem with Prius Tail-Lights is on the Brake Light section, which is already LEDs.

So, it's unlikely that it's an issue with heat from lighting. It appears to be the black plastic vanes absorbing solar heat in an enclosed area.

I haven't heard back from the dealership on what, if anything, Toyota is going to do about it, but since it looks like I'll be going in for TSB EL002-05 anyway, Ill ask again then.

naterprius · 05-02-2005, 06:35 PM

That link won't load.

Nate

DonDNH · 05-02-2005, 06:48 PM

Here is the url in the clear, it loads for me when selected from my previous post.

http://www.superbrightleds.com/cgi-bin/sto...72.23773&next=0

naterprius · 05-04-2005, 11:54 PM

No I mean

http://www.prius-forum.org/

won't load.

Nate

05-30-2004, 03:59 PM	#1
petteri Senior Member Join Date: Dec 2003 Location: Plantation, FL USA Posts: 203 My Car: 2004 Prius Model: Package: #9 Thanks: 1 Thanked 0 Times in 0 Posts Friends: 0	Rear fog light technical info! Ok, after much searching of the web and browsing through the Prius service manual (both in German, which I don't know and English) I've got some info to share! To turn on the rear fog lights in an EU Prius you trun the fog light switch to a "third" stop, i.e. one more that what the US Prius had on its switch. This switch connects to the HEADLAMP DIMMER SWITCH ASSY. from what I've found on page 65-5 in the US manual this is connector C7. In this connector are pins numbered 1 - 20. Pins 3-4 are the ones that control the fog lights on a US Prius. However in Europe pin 2 is also used, and that is the pin that I think controls the rear fog lamp., it is not mentioned in the US manual. So in the US if pin 3 and 4 are "off" the front fog lights are OFF if pins 3 and 4 are on the front fog lights are ON. In Europe I think it works as such; if 2, 3 and 4 are off front and rear fogs are OFF if 3 and 4 are on front fogs are ON if 2, 3, and 4 are on the FRONT and REAR fogs are ON. This is what I've gotten from the German service manual which can be found here: http://www.prius-forum.org page 65-5 in the US version (from Ebay) is found on the german page 65-20. So if anyone here can comment of my "major" :wink: discovery and if this means that all I need to do is install the switch and new taillamp and I'm ready to go. I'm hoping the wire from the ECU to the taillamp is the same I don't know how to verify that yet. Peter Miami, FL USA

05-02-2005, 02:46 AM	#2
oly_57mpg Senior Member Join Date: May 2005 Location: Olympia, Portland, Seattle... Posts: 360 My Car: 2005 Prius Model: Package: #6 Thanks: 0 Thanked 2 Times in 2 Posts Friends: 0	Re: Rear fog light technical info! So... Have you tried this yet?

05-02-2005, 01:48 PM	#4
DonDNH Senior Member Join Date: Feb 2004 Location: Nashua, NH Posts: 717 My Car: 2004 Prius Model: Package: #7 Thanks: 2 Thanked 3 Times in 3 Posts Friends: 0	Re: Rear fog light technical info! LEDs won't generate enough heat to melt. See a wide selection of automotive LEDs here.

05-02-2005, 06:35 PM	#6
naterprius Senior Member Join Date: Mar 2004 Location: USA Posts: 1,831 My Car: Other Non-Hybrid Model: Package: N/A Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Re: Rear fog light technical info! That link won't load. Nate

05-04-2005, 11:54 PM	#8
naterprius Senior Member Join Date: Mar 2004 Location: USA Posts: 1,831 My Car: Other Non-Hybrid Model: Package: N/A Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Re: Rear fog light technical info! No I mean http://www.prius-forum.org/ won't load. Nate

05-02-2005, 06:44 AM	#3
petteri Senior Member Join Date: Dec 2003 Location: Plantation, FL USA Posts: 203 My Car: 2004 Prius Model: Package: #9 Thanks: 1 Thanked 0 Times in 0 Posts Friends: 0	No, for a couple of reasons. I've heard a couple of reports of melting tail light assemblies. I live in Miami and while mine haven't shown any evidence of this I'm wary of spending the cash only to have them melt away. I may wait until this is resolved. I'm also saving my money for some of Coastal Dave's stuff. I found a dealer in Finland that would ship me the EU tail lamp assy. so that part of the project wouldn't be a problem.

05-02-2005, 06:48 PM	#7
DonDNH Senior Member Join Date: Feb 2004 Location: Nashua, NH Posts: 717 My Car: 2004 Prius Model: Package: #7 Thanks: 2 Thanked 3 Times in 3 Posts Friends: 0	Here is the url in the clear, it loads for me when selected from my previous post. http://www.superbrightleds.com/cgi-bin/sto...72.23773&next=0

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