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997 4s side mirror heating

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Hi everybody,

My 2007 997 4s has a little problem.... The side mirror heating does not work at all both left and right.... Adjustment works fine. Rear window heat works ok *** well.....

Does anyone know which fuse to check? Or other solutions?

Thx in advance !


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  • 2 weeks later...

Hi Dennis,

The PiWIS is telling you that the resistance in the mirror heating circuit is off, either to high as in open circuit or to low as with a short. If you pop the triangular cover off inside of the door where the mirror mounts you will find the mirror's power connector. I do not have a wiring diagram but there will be wires for motion control and the mirror heater. You can ID them with a meter, flipping switches seeing which wire gets power. Once you have IDed the wires compare the resistance of the mirror heaters from each side. If one is much higher than the other then it is bad (open, the usual failure mode) If the Mirrors are ok go too the car side of the connector and check that the mirror wires get power when switched on, If not than you have bad wiring, a blown fuse or a bad switch.

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  • Admin

8016 is a re-used code depending on the sub-system.

Still... it has the same meaning - that there is no communication/feedback with the device.

Have you tried removing the mirror and measuring the resistance across the heating element - it may likely be open (infinite resistance).

Or it could be as simple as a bad or broken connection.

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  • 1 year later...

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