Checking Rear Window Heater

Information 

The function of the heated rear window can be checked using a temperature probe with digital display.

1. Switch on rear window heating.

   Information 

   • The heating wire on the rear window must run exactly under the tip of the sensor for this measurement procedure! 
   • After switching the heating on at room temperature and after a period of 2 minutes, the temperature must increase by approx. 2 degrees! 
   • If no temperature increase is shown, the fault must be detected on the basis of the wiring diagram! 
2. The tip of the sensor is used to measure the temperature from the outside on the centre of the rear window.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Rear window (shown on the 991)