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.
Undervoltage cutout does not take place during the thawing phase
In order to maintain the battery charge level, once the initial thawing period has elapsed, the rear window defogger can only be activated for 5 minutes every time the button is pressed.
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.