Mazda 626 Station Wagon, Workshop Manual

Page: 386 / 577

POWER WINDOW SYSTEM
I Pulse Generator
Function
• The pulse generator converts the rotation of the motor into a pulse, and sends a voltage pulse to the power
window control module.
Structure
• The pulse generator consists of gear A, which rotates with the motor shaft, gears B, C, and D to increase
rotation speed, the magnet, which generates pulse, and the hole 1C.
(D
+5 V
GND
<D
1 Gear A
2 Gear B
3 GearC
4 Gear D
5 Magnet
6 Hole IC
7 Motor rotation signal
8
Bottom of door glass
9 Top of door glass
Operation
• When the magnet rotates, the hole 1C detects the N/S magnetic field and outputs it as a voltage pulse.
• For each rotation (movement of the door glass: approximately 144 mm {5.67 in}) of the motor, 96 pulses are
generated.
• The output waveform in the figure above describes the signal waveform when the motor is connected to the
P/W CM. If the motor is not connected to the P/W CM, electric power is not supplied to the hole IC and the
waveform is not output.
S -5