Heating Diagnosis

Identification

Control module identification data can be read out with this menu item.

The following information is displayed:
- Porsche Part No.
- Hardware version
- Software version
- Date of production
- Serial number in week
- Production data
- Diagnostic software number

Erasing The Fault Memory

NOTE: The fault memory can be erased only if it was first read out at least once.

The entire fault memory is always erased.

Drive Links
With this menu item, it is possible to activate drive links of the heating/air-conditioning system using the Porsche System Tester 2. This allows the function of the drive links to be assessed very quickly.

The following drive links can be activated:
- Motor, temperature mixing valve
- Motor, central valve
- Motor, footwell / defrost valve
- Motor, outside air / recirculation valve
- A/C button
- Fresh-air blower

Input Signals
With this menu item, input signals of the heating/air-conditioning system can be read in using the Porsche System Tester 2. This allows the function of the input signals to be assessed very quickly.

The following input signals can be read in:
- A/C button
- Compressor voltage
- Engine signal (indication of engine start)
- Terminal 58 (lighting)

Actual Values
Values currently under test can be read out via this menu item.

The following values can be called up:
- Outside temperature (from the instrument cluster)
- Outside temperature
(from the heating/air conditioning)
- Interior temperature
- Blower outlet temperature
- Engine temperature
- Position of temperature mixing valve
- Position of central valve
- Position of footwell / defrost valve
- Position of outside air / recirculation valve
- Fresh-air blower voltage
- Supply voltage (terminal 15)
- Supply voltage (5 volts)
- Vehicle speed
- Engine speed
- Sun intensity
- Dimming display
- Idle period
- Parameter code

System Test
Special diagnosis routines can be run with this menu item.

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

After the system test, the heating/air conditioning reverts to the state it was in before the test.