Audi Workshop Service and Repair Manuals > A4 Cabriolet Mk2 > Heating, ventilation, air conditioning system | Auxiliary heater | Self diagnosis, V.A.G Inspection Service | Auxiliary heater electrical checks | Electrical checks at vehicle electrical system connector | Signal from auxiliary heating radio controlled receiver R64

Signal from auxiliary heating radio controlled receiverR64

Signal from auxiliary heating radio controlled receiver -R64-

Note

t	Pay attention to correct setting on oscilloscope to ensure that image shown in the two illustrations is displayed (operating mode “Auto”, voltage “DC”,trigger mode “negative edge” etc.).

t	To ensure proper oscilloscope response, approx. 4 V is to be set as the value for the trailing pulse (negative edge).

ON signal

-A- DC voltage signal, no signal being received (none of the auxiliary heater remote control buttons pressed)

-B- ON signal from auxiliary heater remote control being received (auxiliary heater remote control ON button is being or has been pressed)

OFF signal

-A- DC voltage signal, no signal being received (none of the auxiliary heater remote control buttons pressed)

-B- OFF signal from auxiliary heater remote control being received (auxiliary heater remote control OFF button is being or has been pressed)