Removing and Installing Heating/Air-Conditioning Control

Removing And Installing Heating/air-conditioning Control

1. Unclip cover.
2. Unscrew fastening screws (2 ea.) and pull the heating/air-conditioning control out of the dashboard.







3. Disconnect the plug connections

NOTE: Basic adaptation to the system must be performed with a new heating/air-conditioning control. This is indicated by flashing of the displays for approx. 5 to 10 seconds each time the ignition is switched on. Basic adaptation is performed during the system test.


Performing system test
1. Connect and switch on the Porsche System Tester 2.
2. Select air conditioning and menu item System test.

The following conditions must be observed for the system test:
- Vehicle speed < 10 km/h (6 mph)
- Engine start detected and 10 seconds elapsed since engine start
- Terminal 15 supply voltage OK
- 5-volt supply voltage OK
- Engine temperature < 110 degrees C
- Outside temperature 3 degree C

The following tests are performed:
- Display of all segments in the control module
- The drive motors are traversed across the entire range once
- The measured positioning travel is subjected to a plausibility test and stored as a fault if necessary
- Two different voltage values are set on the fresh-air blower and tested The A/C circuit is tested via the DME
- All fault paths are tested and any faults are stored

Basic adaptation is carried out after the system test has been completed. The display must no longer flash.