Exterior Mirrors
Exterior Mirrors
The exterior mirrors on all models incorporate electrical heating and adjustment. Depending on vehicle model and market, the exterior mirrors may also incorporate mirror foldback, memory recall and reverse dipping.
On some vehicles, an approach lamp is integrated into the underside of the exterior mirror housing.
Heating
Exterior mirror heating is provided by heater elements bonded to the back of the mirror glass. The power supply to the heater elements is controlled by the ATC (automatic temperature control) module.
The windshield washer jet heaters and the exterior mirror heaters are permanently enabled while the ignition switch is in position II. The heaters are controlled by a 30 seconds period PWM (pulse width modulation) signal from the ATC (automatic temperature control) module to the coil of the heated washer jets/exterior mirrors relay in the BJB (battery junction box). When the relay is energized, it connects a battery power feed to the heaters. To vary the time that power is applied to the heaters, the ATC (automatic temperature control) module varies the on-time percentage of the PWM (pulse width modulation) signal, depending on the ambient air temperature and the status of the windshield wipers. When the ignition switch is first turned to position II, the ATC (automatic temperature control) module initially sets the on-time percentage of the PWM (pulse width modulation) signal to 100%, for a time that varies with ambient air temperature. After the initial heating period, the on-time percentage varies according to the status of the windshield wipers.
Exterior Mirror Heating Percentage On-times
Adjustment
The exterior mirrors each incorporate two adjustment motors. One for horizontal (left/right) adjustment and one for vertical (up/down) adjustment. Operation of the motors is controlled by the exterior mirror control switch, which is installed on the mirror cheater of the driver door. Adjustment is enabled when the ignition switch is in position I or II.
The exterior mirror control switch is a combination rotary switch and joystick. Turning the switch left or right from the central position selects the respective exterior mirror to enable adjustment. Tilting the switch connects a power supply and ground to the appropriate adjustment motor to produce a corresponding movement of the mirror glass. When the switch is tilted in the opposite direction the polarity of the adjustment motor connections is reversed, to move the mirror glass in the opposite direction.
On vehicles with memory recall, the connections from the exterior mirror control switch to the adjustment motors are routed through the memory module.
Exterior Mirror Control Switch
Memory Recall
On vehicles with memory recall, each adjustment motor in the exterior mirrors incorporates a feedback potentiometer, which outputs a position signal to the memory module. The positions of the exterior mirrors, together with that of the driver seat, are stored in the memory module in two ways:
^ Manually, using the memory store and reset buttons.
^ Automatically, for the lazy entry feature, each time the ignition switch is turned from position II to position I.
When the ignition switch is in position I or II, pressing the memory store button (M), then pressing reset button 1, 2, or 3 within 5 seconds stores the current positions of the exterior mirrors and the driver seat in the memory module. A single chime sounds and a memory stored message appears in the message center to confirm that the operation was successful.
Stored positions can be recalled when the vehicle is either stationary or moving. When the vehicle is stationary, a momentary press of a memory reset button causes the exterior mirrors and driver seat to move to the positions stored against that button, provided the driver door is open or the ignition switch is in position I or II. When the stored positions are reached, a double chime sounds, and a memory recalled message appears in the message center, to confirm that the operation is complete. During transition to the stored positions, movement of the exterior mirrors stops immediately if the exterior mirror control switch is pressed (any direction).
To prevent inadvertent operation when the vehicle is in motion, the memory reset button must be pressed and held for the exterior mirrors to move.
During a memory recall, the memory module determines a mirror adjustment motor has stalled if there is no change in the signal from the related feedback potentiometer for more than 100 ms. If a stall condition is detected, the drive to the applicable adjustment motor is cancelled for the remainder of the memory recall operation. The adjustment motor can be activated again by pressing the exterior mirror switch in the appropriate direction until the required position is reached.
Each time the ignition switch is turned from position II to position I, the memory module automatically stores the positions of the exterior mirrors and driver seat, together with the identity of the ignition key. If the lazy entry feature is enabled, when a remote control is used to unlock the vehicle, the memory module compares the stored positions of the exterior mirrors and driver seat, for the associated ignition key, against the current positions. If necessary, the memory module then moves the exterior mirrors and driver seat to the stored positions. If the lock button on the remote control is pressed, during lazy entry movement of the exterior mirrors or driver seat, all movement stops immediately.
The locking status of the doors is transmitted to the memory module from the CJB (central junction box) on a LIN (local interconnect network) bus. The lazy entry feature can be enabled and disabled in the customer settings menu.
Exterior Mirror
Reverse Dipping
On vehicles with memory recall, both of the exterior mirrors automatically dip when the ignition switch is in position II and reverse gear is selected. When the gearshift lever moves out of reverse the exterior mirrors return to their original positions. The reverse dipping function is controlled by the memory module.
Initially, the dipped positions are default values programmed into the memory module for each ignition key. If, while reverse gear is selected, the exterior mirrors are adjusted and then a memory store sequence is initiated, the default positions are overwritten with the new dipped positions for that particular memory setting. The new dipped positions are then recalled the next time that reverse gear is selected with that particular ignition key in use. Storing the exterior mirror positions with reverse gear selected only affects the dipped positions, the remainder of the memory positions are unchanged.
When reverse gear is selected there is time delay of approximately 0.5 second before the exterior mirrors move to the dipped position. The time delay prevents nuisance movement of the exterior mirrors when the gearshift lever moves from Park to Drive.
The reverse dipping feature can be enabled and disabled in the customer settings menu.
Foldback
Exterior mirrors with the foldback feature incorporate a foldback motor in the hinge of each exterior mirror. Operation of the foldback motor is controlled by the exterior mirror control switch and the foldback module.
The foldback module is installed immediately outboard of the CJB (central junction box), and controls power and ground connections to the foldback motors.
When the exterior mirror control switch is in the center (off) position, tilting the switch down connects a ground to the foldback module. When it senses the ground signal for the first time, the foldback module connects a power supply and a ground to the foldback motors to turn the exterior mirrors inwards. Tilting the switch down again causes the foldback module to reverse the polarity of the connections to the foldback motors, and the motors turn the exterior mirrors outwards. If the switch is operated while the exterior mirrors are moving, they stop and reverse direction until they reach their original position. If one of the exterior mirrors has been manually folded, they can be re-synchronized by an inward and outward operating cycle.
To prevent the foldback motors from overheating, the foldback function is disabled for 3 minutes if the mirror foldback function is selected ten times within 60 seconds. On the tenth selection within 60 seconds, the exterior mirrors will only unfold; if the selection is for the exterior mirrors to fold, the selection is ignored.
Foldback Module Harness Connector C0907
Foldback Module Harness Connector C0907 Pin Details
