Rear de-mist

Fig 1: Identifying Rear De-Mist

Courtesy of VOLVO CARS OF NORTH AMERICA.

There are heating loops in the glass for de-misting and to prevent ice from forming. The loops heat up when they are supplied with power. The power supply is via a directly connected relay in the rear electronic module (REM).

Rear de-mist is controlled using a switch on the right-hand side of the climate control module (CCM).

The engine must be running for the demister to work. Press the button again to switch off the function. De-misting is switched off automatically after the maximum time of 12 minutes.

There are diagnostics for the switch via the climate control module (CCM).