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419-10-6 Multifunction Electronic Modules 419-10-6 DESCRIPTION AND OPERATION Heated rear window and heated external mirrors The heated rear window and the heated exterior mirrors are switched on by the BCM under the following conditions: ‡ The heated rear window switch is operated, the ignition switch is in position "II" and the charge warning lamp is switched off. ‡ The "Defrost" function of the climate control has been activated, the ignition switch is in position "II" and the charge warning lamp is switched off. The heated rear window and the heated exterior mirrors are switched off by the BCM under the following conditions: ‡ More than 4 minutes have elapsed since the switch for the heated rear window was operated. ‡ The engine is switched off. ‡ While the heated rear window is switched on, the switch for the heated rear window is pressed or the "Defrost" function of the climate control is deactivated. ‡ The battery voltage has dropped below 10.3 V for more than 20 seconds (power management strategy). Manual requests for switching on the heated rear window by pressing the switch, are ignored at this time. If the battery voltage returns to the normal range then the disabling of the heated rear window is cancelled - the heated rear window is then in a switched-off state. Windshield wash/wipe system The windshield wiper system is equipped with just one wiper motor, and this motor is connected to the BCM via a simple cable connection. The windshield wash/wipe system will only operate if the ignition switch is in the position "I" or "II". Four wipe functions are available: "Single Wipe", "Speed 1", "Speed 2" and "Intermittent Wipe" or "Automatic Wipe" (depending on the specification of the vehicle)". In "Speed 1" or "Speed 2" mode, the wipers are operating continuously at either normal speed or fast speed. When the intermittent wipe mode is switched on the windshield wipers operate at normal speed with the following wiper delays: ‡ Wiper delay 1: 1 second ‡ Wiper delay 2: 3.5 seconds ‡ Wiper delay 3: 6 seconds ‡ Wiper delay 4: 9.5 seconds ‡ Wiper delay 5: 15.5 seconds ‡ Wiper delay 6: 22 seconds In the event of a failure, the default time for the wiper delay is 3.5 seconds. When the windshield washer switch is operated washer fluid is sprayed onto the windshield. After a short delay designed to protect the wiper blades the wipers perform 2 or 3 wipes at low speed. If when the windshield washer switch is activated the windshield wipers are switched off, a single wipe is performed 4 seconds after the wipers have returned to the home position after performing the 2 or 3 wipes. If the wipers are set to intermittent wipe and the window washer switch is actuated, the wipes are only performed if no further wipe request has been selected via a shorter delay time within the 4-second delay time. The post wipe function on the windshield ensures that any water remaining on the windshield after washing is wiped away. It is only required if the wipers are switched off or they are set to intermittent mode. Rain sensor The automatic windshield wipers must be switched off before the vehicle is driven into a car wash. If the windshield is iced up, the wipers may only be activated by the rain sensor after the windshield has been completely defrosted. The rain sensor is an optical measuring instrument. Contamination such as oil, grease, dust or faulty wiper blades will prevent the system from working properly. Before switching on the automatic windshield wipers, the windshield must be clean in the area of the rain sensor. The rain sensor is built into a housing which is mounted behind the rear view mirror on the windshield.