Basic Principle
The control circuit of electric rear-view mirrors is shown in Fig.3.6.Take the left rear-view mirror circuit to explain the working principle of control circuit.
Fig.3.6 Circuit Diagram of Electric Rear-View Mirrors
(1)If needing to adjust the oblique degree of left rear-view mirror in vertical direction,press the button“L”and then press the up and down arrow of rear-view mirror adjustment button.
①“Upward”process:The direction of the current is:the power→fuse 23→switch terminal 8→switch terminal 4→connection terminal 1 of left electric rear-view mirror→“Up/Down”motor→connection terminal 2 of left electric rear-view mirror→switch terminal 6→switch terminal 7→ground,then a circuit forms and at this moment,the left rear-view mirror rotates upward.
②“Downward”process:The direction of the current is:the power→fuse 23→switch terminal 8→switch terminal 6→connection terminal 2 of left electric rear-view mirror→“Up/Down”motor→connection terminal 1 of left electric rear-view mirror→switch terminal 4→switch terminal 7→ground,then a circuit forms and at this moment,the left rear-view mirror rotates downward.(https://www.daowen.com)
(2)When needtng to adjust the oblique degree of left rear-view mirror in horizontal direction,press the button“L”and then press the left and right arrow of rear-view mirror adjustment button.
①“Leftward”process:The direction of the current is:the power→fuse 23→switch terminal 8→switch terminal 5→connection terminal 3 of left electric rear-view mirror→“Up/Down”motor→connection terminal 2 of left electric rear-view mirror→switch terminal 6→switch terminal 5→ground,then a circuit forms and at this moment,the left rear-view mirror rotates leftward.
②“Rigftward”process:The direction of the current is:the power→fuse 23→switch terminal 8→switch terminal 6→connection terminal 2 of left electric rear-view mirror→“Up/Down”motor→connection terminal 3 of left electric rear-view mirror→switch terminal 5→switch terminal 7→ground,then a circuit forms and at this moment,the left rear-view mirror rotates rightward.
(3)If needing to fold the rear-view mirrors,press the folding button of rear-view mirrors,then pin C39 of BCM will receive the ground signal from folding switch of rear-view mirrors and pin A07 of BCM will output power to motor,which brings the rear-view mirrors to realize the automatic folding.Press again,pin A06 of BCM will output power to motor,and the rear-view mirrors will unfold automatically.Pin positions are shown in Fig.3.7.
Fig.3.7 Positions of Pin A6,A7 and C39