01520

01520 - Rain and Light Recognition Sensor (G397)

01520 - Rain and Light Recognition Sensor (G397): Implausible Signal

Possible Symptoms

• Rain/Light Recognition Sensor (G397) not functioning

Possible Causes

• Fuse(s) faulty
• Wiring from/to Rain/Light Recognition Sensor (G397) faulty
• Central Electronics Control Module (J519) incorrectly coded

Possible Solutions

• Check Fuse(s)
• Check Wiring from/to Rain/Light Recognition Sensor (G397)
• Check Central Electronics Control Module (J519) Coding

Special Notes

• Aftermarket windshields or gel packs not to factory design can cause issues:
  • https://forums.ross-tech.com/index.php?threads/46323/
• When found in VW Golf (1K): Central Electronics
  • Check Supply Voltage
    • See Measuring Value Block (MVB) 013.3
  • Check Light Sensor Status
    • See Measuring Value Block (MVB) 016.2

• When found in VW Phaeton (3D): Roof Electronics
  • Check Rain Sensor Status
    • See Measuring Value Block (MVB) 011.2
  • Check Light Sensor Status
    • See Measuring Value Block (MVB) 011.2