Jump to content

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)

Parasitic Battery Drain - Heating / Climatronic

Recommended Posts

Our car has a parasitic battery drain that is very noticeable.
I've found a fuse, that when pulled drops the measured battery drain from ~ 140mAmps to 10mAmps.
This is repeatable.
The fuse index says it's the heating / climatronic which I take to be the HVAC control
I know that 964 / 993 CCUs Climate Control Units have this failure mode.

Have any of you seen it in a 997.2 Carrera?
140 mAmps with fan off and HVAC off.


I'm uncertain how to troubleshoot the CCU

Thank you

Link to comment
Share on other sites

Since I'm making this troubleshooting process up as I go along, I just;

Took the meter out of the circuit.

Connected the battery

Key on

Cycled thru all of the HVAC functions

Turned HVAC system OFF

Put the meter back in the circuit

No change


sad face

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • 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.