Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

I have a 2004 cayenne turbo and recently been having issues with my automatic lights. When I put the headlight switch to automatic, the headlights always come on, even in daylight.  I ran a check on piwis and durametric and get the 1520 error for the rain/light sensor. I have cleared the error and it comes back as soon as the light switch is turned back on. I found a used rain/light sensor which I installed and still have the same problem. I also disconnected the sensor and turned the lights to the automatic setting and they come on without the sensor connected which I am not sure if that would happen anyway. I guess it is possible that the used sensor I got could also be bad. Is there a way to do a resistance check on the sensor. Are there other components in the system I should be checking as well. I did check the fuse and it is fine.

Link to comment
Share on other sites

  • 2 weeks later...
    You can remove these ads by becoming a Contributing Member.

As an update, I have been able to narrow down the problem that there is no power going to the sensor from the Wire at the fuse box. The other wire at the fuse block is live but it is not getting to the sensor. Does anyone know where the harness for the rain sensor and mirror travels. Is it down the A pillar on the driver's side?

Link to comment
Share on other sites

Posted (edited)

As another update, I ran a new power and ground wire to the sensor and it got the light activation portion of it working again. I will need to check the rain sensor portion but got the codes to finally clear.

Edited by mbagge01
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.