Basic Principle
The wiper motor output shaft worm rod makes the worm gear rotate so as to reduce output power.The worm gear is covered with one conductive disk with one gap(as shown in Fig.3.15),and two electrified springs are pressed against the conductive disk.When the spring moves through the part without gap,two springs are conducted.When the worm gear rotates,making the gap move to the spring position,two springs are open circuit.With the gap,the motor can be kept in a certain position,namely,wiper arm can stop at a fixed position,which won’t block the driver’s sight.
Fig.3.15 Structure of Wiper Motor Assembly
Wiper system circuit is shown in Fig.3.16.
Fig.3.16 Wiper System Circuit Diagram
The fuse position is shown in Fig.3.17 and the definition of each connector pin is shown in Fig.3.18,pin definitions are shown in Table 3.6.
Fig.3.17 Fuse Position
Fig.3.18 Pin Definition
Table3.6 Pin Definitions(https://www.daowen.com)
Wiper system circuit is shown in Fig.3.16.Turn on the ignition switch,the current of power IG2 passes through DF01 fuse inside instrument panel fuse box to provide electricity for pin 8 of wiper combination switch,pin 1 of front wiper motor and pin 1 of front washer motor,pin 3 of rear wiper motor and pin 1 of rear washer motor respectively.The principle of each gear circuit is as follows:
Front Wiper LO:The current passes through DF01 fuse inside instrument panel fuse box to provide electricity for pin 8 of wiper combination switch,which is conductive with pin 7 and provides electricity for pin 5 of the motor through pin 7 and at this moment,the motor operates in low speed mode.
Front Wiper HI:The current passes through DF01 fuse inside instrument panel fuse box to provide electricity for pin 8 of wiper combination switch,which is conductive with pin 9 and provides electricity for pin 4 of the motor through pin 9 and at this moment,the motor operates in low speed mode.
Front Wiper MIST:The pin 7 of wiper switch is conductive with pin 8 once and the wiper will operate one circle at a low speed.
Front Wiper OFF:The current passes through DF01 fuse inside instrument panel fuse box to provide electricity for pin 1 of front wiper motor,and because the motor hasn’t returned,the springs connecting pin 1 and 2 inside the motor are conductive,providing electricity for pin 6 of wiper switch through pin 2 of the motor and then pin 6 of wiper switch is conductive with pin 7 and provides the electricity for pin 5 of the motor through pin 7,and the motor returns in low speed.After returning,the springs connecting pin 2 and 3 of the motor are conductive,the motor armature winding is short circuit and as it can’t stop immediately due to the inertial,it will operate in the mode of the generator and produce huge back EMF and braking moment so as to make the motor stop quickly and the wiper blade stop in a specific position.
Front Wiper INT:The current passes through DF01 fuse inside instrument panel fuse box to provide electricity for pin 8 of wiper combination switch,and the combination circuit inside the wiper switch makes pin 7 and pin 8 conductive intermittently,and when they are conductive,the wiper motor operates in low speed.When disconnecting the conduction between pin 6 and 7,the motor returns in low speed.The intermittent conductive time can be regulated in five gears.
Front Washer:Pin 7 and pin 8,pin 4 and pin 5 of wiper switch are conductive respectively,and the motor operates in low speed,the current passes through DF01 fuse inside instrument panel fuse box to provide electricity for pin 1 of front washer motor,and pin 2 of washer motor is grounded G101 through pin 4 and 5 of wiper switch,then the washer motor sprays water constantly and the wiper motor wipes water continuously.(When the front wiper switch is off,and the washer switch is pressed for more than 300 ms,then the wiper operates in low speed,and after releasing the switch,the front wiper operates 2 circles and after 6s,works another circle.When the front wiper is in INT position,and the washer switch is pressed for more than 300 ms,then the front wiper operates in low speed,and after releasing the switch,the front wiper operates 2 circles and after 6 s,returns to interim operation.When the front wiper switch is in HI or LO position,and the washer switch is pressed for more than 300 ms,then the wiper still operates in high or low speed.If the washer switch is pressed for less than 300 ms,the wiper motor doesn’t operate.).
Rear Wiper ON:The current of power IG2 passes through DF01 fuse inside panel fuse box to provide electricity for pin 3 of rear wiper motor.Pin 2 and 5 of wiper combination switch are conductive,providing the start signal of rear wiper motor for pin C09 of BCM,and BCM controls intermittent grounding of pin 1 of rear wiper motor through pin B10 and the wiper is in the mode of interim operation.
Rear Wiper Washer:The current of power IG2 passes through DF01 fuse inside panel fuse box to provide electricity for pin 1 of rear washer motor.Pin 3 and 5 of wiper combination switch are conductive,and pin 2 of rear washer motor is grounded G101 through pin 3 of wiper switch and meanwhile,provides the start signal of rear washer motor for pin G32 of BCM,and the washer motor sprays water constantly.
Rear Wiper OFF:All the pins are disconnected and the motor hasn’t returned.The springs inside the motor are conductive and the current of power IG2 passes through DF01 fuse inside panel fuse box to provide electricity for pin 3 of rear wiper motor,which is connected with one electric brush of the motor.The other electric brush of the motor is grounded G205 through two springs inside the motor and the motor operates to the returning status.
Rear Wiper Water Spraying and Wiping:Pin 2,3 and 5 of wiper switch are conductive mutually and BCM receives water spraying and wiping signal at the same time,the rear washer sprays water constantly and the rear wiper operates continuously,and after releasing the switch,the rear wiper works three circles in succession and after 6s,works another circle.