Technical Training
Exterior Rearview Mirrors
2 electric rearview mirrors are fitted on the driver's and passenger doors of the E65/E66. They are activated by the front door modules.
All the mirror functions are controlled by the buttons in the switch block in the driver's door. The mirrors are directly controlled by the associated door module.
The following functions are possible:
- Horizontal and vertical mirror adjustment
- Mirror heating
- Automatic curb view
- Mirror memory
- Electro-chromatic
- Under-voltage deactivation
Horizontal and Vertical Mirror Adjustment
Both the exterior mirrors can be moved in the horizontal and vertical directions. However, they can only be adjusted in each case in one direction (horizontal/vertical).
Each exterior mirror accommodates 2 adjusting motors: one motor for each adjusting direction. Potentiometers are fitted for position detection.
A common control pad for both exterior mirrors is located in the driver's door.
The driver uses a slide switch to select between the two mirrors (right/left).
Mirror Heating
The function of the mirror heating is automatically controlled. The mirror heating is supplied via PWM signal.
The current output is dependent on outside temperature and wiper operation. The outside temperature and wiper operation are delivered via the K-CAN.
The heat output is increased in wiper mode in order to make any raindrops on the mirrors evaporate.
When the wiper is deactivated, the higher percentage ON period remains active for a further 5 minutes. The mirror heating is operational from terminal 15 "on". It is deactivated with terminal 50 "on"(load deactivation during the starting sequence).
The mirror heating is deactivated with priority 4, 5 and 6 for the function "Optimum charging of Power Module"(see Power Management).
- Cut-off voltage:10.8V
- Cut-in voltage:11.6V
Automatic Curb View
When the vehicle is being reversed, the passenger mirror is moved downward in order to provide a better view of the curb. Conditions needed are:
- The exterior-mirror selector switch for operating the driver's mirror is selected.
- Terminal 15 "on"
- Reverse gear is selected
Signal path: EGS PT-CAN ZGM K-CAN S CAS K-CAN P door module.
- Delay time:1 second after selection of reverse gear (in order to avoid unnecessary activation of passenger mirror when reverse gear is accidentally selected).
The passenger exterior mirror immediately reassumes its original position:
- After the reverse gear has been deselected
- or with terminal 15 "off".
Manual mirror adjustment is disabled until the mirror reaches its initial position.
Mirror Memory
The mirror-memory function is part of the seat-memory function. The current mirror settings on the driver and passenger sides can be stored or mirror settings already stored can be recalled using the memory buttons in the vehicle and the Key-Memory function.
The memory positions are stored in the driver's/passenger's door modules.
The potentiometers for position detection are supplied by the door modules with a voltage of 5 V. The potentiometers are deactivated in sleep mode.
The various mirror-adjustments have different priorities.
- Manual mirror adjustment has priority over all other mirror adjustments. Manual mirror adjustment interrupts any memory adjustment.
- Mirror adjustment by means of the buttons of the memory function has priority over mirror adjustment by means of the Key Memory:
A mirror activation in progress which has been initiated by the Key Memory is cancelled when the memory buttons are operated.
Electro-chromatic Exterior Rearview Mirrors
Electro-chromatic exterior rearview mirrors ensure that the driver is not dazzled by the headlights of vehicles from behind.
The exterior mirrors are automatically dimmed when a light source coming from the rear is detected. The sensor and control electronics for this function are integrated in the inside rearview mirror.
- A photo sensor in the inside rearview mirror measures the amount of light coming from the rear of the vehicle as opposed to the front.
- The control electronics calculates the amount of dimming required for this incidence of light. Stronger or weaker dimming of the exterior mirrors is performed depending on the degree of potential dazzling.
The control signals are transmitted from the inside rear view mirror via the front door modules to the exterior mirrors.
Under-voltage Deactivation
Under-voltage deactivation ensures that primary electrical-system functions take priority over the mirror functions.
The supply voltage is monitored locally in the door modules. All the mirror functions are disabled if the supply voltage drops below 8.5 V.
Once the voltage has dropped below this limit, the mirror functions are not available again until system voltage increases over 9 V.