10
E46 Climate Control
CONVERTIBLE REAR WINDOW DEFROSTER
Purpose of the System:
A two relay system was designed for the E46iC that supplies power to either rear window
defogger grid. The two relay system will also communicates with the audio system amplifi-
er to change the dynamics of the sound for either top up/hard top installed or top down
driving
Components of the System
:
Two relays, located on the right side rear quarter panel behind the interior trim cover, are
used for rear defroster operation.
• Relay K-13 receives KL 30 and the activa
tion signal from the IHKA control module.
The output from the relay will switch the
rear defroster ON if the hard top is installed.
• Relay K-99 receives KL 30 from relay K-13
and it supplies the rear defogger grid in the
soft top glass window when the top is
raised.
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