Exterior Mirror Heaters

Operation of the exterior mirror heaters is fully automatic and requires no input from the driver. The exterior mirror heaters are active when the ambient air temperature is below 5°C (41°F) and engine coolant temperature is below 65°C (149°F). Ambient air and engine coolant temperature values are provided by the ECM on the high speed CAN bus. On receipt of these temperature values, the CJB determines if exterior mirror heating is required.

The CJB requests exterior mirror heating by transmitting a high speed CAN bus message to both the drivers and passenger door modules. The door modules provide feed and ground paths to the respective exterior mirror heating elements. When ambient and engine coolant temperature rises above the values stated earlier, the CJB transmits a high speed CAN bus message to the door modules cancelling the heating request.