Checking with temperature probe

NOTE:

The function of the heating for the rear window can be checked with a temperature probe with digital display.
The indicator light in the rocker switch also lights up if a fault is present and the heating wires in the rear window do not warm up!

Take the measurement with the tip of the sensor at the centre of the rear window on the outside.

Fig 1: Taking Measurement With Sensor Tip At Centre Of Rear Window On Outside

Courtesy of PORSCHE OF NORTH AMERICA, INC.

NOTE:

The heating wire on the rear window must run exactly under the tip of the sensor for this measurement procedure!
After switching on at room temperature, the temperature must increase by approx. 2 degrees after 2 minutes!
If no temperature increase is shown, the fault must be diagnosed using the wiring diagram!