Rear Window Defogger; Convertible Heated Rear Window - BMW 1999-2005 M3 Service Manual

Heating and Air Conditioning
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Cooling System.
Servicing the A/C system requires the
use of specialized equipment. Follow the
equipment manufacturer's instructions.

Rear window defogger

The electric rear window defogger switch
is integrated in the IHKA control panel.
Pressing the rear window defogger
button activates the rear window heating
element for about 17 minutes, although
this can be changed through Car
Memory settings. Pressing the button
again activates a cycle of 40 seconds
on/80 seconds off for 5 minutes.
The defogger element in the rear glass
is integrated with the radio antenna.
The rear window defogger relay (arrow)
is located in the right side of the luggage
or cargo (Sport Wagon) compartment
behind the trim.

Convertible heated rear window

In the E46 Convertible, both the soft top
and the hard top are equipped with rear
window defogger. Power is supplied by
two relays located on the right side rear
quarter panel behind the interior trim
cover.
Rear defogger operation is controlled by
the IHKA control module.
2/25/2009 11:16 PM