Rear window defogger

Thawing phase

After terminal 15 new start and after being switched on for the first time, the time interval for the rear window defogger is determined in order to achieve an optimum thawing effect.

• Thawing time at outside temperature > 15 ^o C = 10 minutes
  
• Thawing time at outside temperature < 15 ^o C = 17 minutes
  

Undervoltage cutout does not take place during the thawing phase

After-heating phase

In order to protect the battery charge level, after the thawing time has elapsed for the first time, the rear window defogger is only activated for 5 minutes every time the button is pressed.

Undervoltage cutout

At low engine speeds (up to 1500 rpm), the charge status can be turned negative as the result of high loads. For this reason, the rear window defogger relay is switched off when terminal 30 drops below 11.4 V. The rear window relay switches on again when a voltage above 12.2 V is detected.