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

 

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.