I’d like to share a simple coding setup that lets you close the windows when it rains. I couldn’t find any proper instructions for this online.
09 Onboard Power Supply
Long Coding / G397_RLFS Subsystem
-
Byte 0
- Bit 0 Highway Light Function active (Above 140 km/h)
- Bit 1 Rain Light Function Active
- Bit 3-4 00 – Light Activation Threshold Normal
- Bit 6 Rain Sensor inactive
- Byte 1 00
-
Byte 2
- Bit 0-3 0C – Light Sensor: Audi A3 8V / Audi Q5 (8R)
- Bit 4-7 60 – Rain Sensor: Audi A3 8V / Audi A6/A7 4G with tinted glass [PR: 4GQ] / Audi Q3 8U
Final coding
07 00 6C
Adaptations / 09 Onboard Power Supply
- [LO]_Regenschliessen_ein_aus → Rain closing: on/off — active → The function is activated. The car will automatically close the windows when it rains. [VN]_active
- [LO]_Regenschliessen_art → Rain closing type — permanent → Automatic closing works continuously (not temporarily or conditionally). [VO]_permanent
- [LO]_Menuesteuerung Regenschliessen → MMI menu control — active → The user can control this function through the car's MMI menu. [VN]_active
On some cars, 06 works in the first byte; in mine, it is 07. I don’t know what determines this—most likely, the presence of a camera in the windshield.
Easy to test: just open the windows, turn off the engine, lock the car (arm the alarm), and hold your palm over the light/rain sensor on the windshield.
That’s all—a simple and useful coding setup.