My '02 e46 was imported from Japan and it had infamous infrared key which only works from couple meters. So i did retrofit of radio frequency key and changed antenna module as mine did not had radio frequency receiver for key. I followed instruction on the forums and connected 2 wires from new module to gm5 and fuse pins as mentioned and paired the key new to the car. The Key now locks/unlocks car fine and starts the engine with the transponder from the old key.
Also forgot to mention that i've removed climate controls while installing it just to feed wires to the fuse box from under the console. And disconnected the battery for couple hours.
SO NOW THE BATTERY DRAIN PROBLEM: Car starts normally after sitting for 2-3 day locked, but when unlocked 15-20 mins later it won't even try to spin a starter, just clicks and flashes headlights. I checked for errors with INPA there's only 1 error and its's power on reset
Also when i try to start the car the blower fan makes the noise like "drrrr" for 15-20 seconds.
Can it be FSR? And why does it do it after i did the module change? If it's FSR can i fix it w/o replacing?
Any help would be appreciated, thanks