A well-known issue with Sprinters is water leakage and condensation above the cabin roof. In our case, water has infiltrated through two main sources:

• The antenna mount, which was repaired shortly after we purchased the van.
• Condensation drips, which we only discovered a few weeks ago.

The water drips directly onto the dome light, which also houses the alarm controls. This has caused short circuits and accelerated oxidation of the circuit board.

Since condensation is difficult to eliminate entirely, I’ve decided to coat the board with a PCB sealant as a protective measure.