Check With The Temperature Probe

Information 

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

Temperature probe Nr.164 Pos.1 

The tip of the sensor is used to measure from the outside on the center of the rear window. 

Fig 1: Measuring Temperature Of Rear Window

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

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!