Chery QQ Service Manual BCM Computer Control System
side of the lower evaporation box. It gets power supply from the secondary cell, and
receives opening and closing signal from the door lock device of the front left door to
control the direction of the central door lock device. The BCM computer (theftproof
computer) is in charge of controlling the central door lock and power window.
(2) Door lock operating device (driver seat side)
When the driver opens the front left door from outside, the micro switch inside the door
lock operating device connects the circuit to the ground or disconnected it from the
ground, and sends signals to the BCM computer (theftproof computer). When the driver
opens the front left door from inside, by turning the start-up switch off and pulling the
key out, the BCM computer (theftproof computer) will unlock the central control door
lock automatically, or if the door on the driver side is open directly, the central controlled
door lock will be unlocked.
(3) Door lock operating device (front passenger side door and rear doors)
Midget motors are provided in the three door lock operating devices. Both terminals of
each of these motors receive positive or negative current from the BCM computer
(theftproof computer), the rotating direction of the motors is changed, and the door locks
are operated in opening or closing direction through the connecting rods.
(4) Inspection of the door lock motor
Malfunction of the door lock motor can be determined by checking the electric resistance.
Specifically, check the electric resistance on the terminal 1 and 2 of the connector of the
door lock operating device. If infinity shows, broken coil of the motor can be determined.
A simple way of inspection is, supply instantaneous (within 0.3s) current to the
terminal 1 and 2 of the connector of the door lock operating device, the motor should
rotate; if reverse current is supplied, the motor should rotate in opposite direction. It
should be noted, that the supply time should be short, otherwise the armature coil may be
damaged due to overload.
①Inspection of the operating of motors
a、Connect the positive pole (+) to the terminal 1, and the negative pole (-) to the
terminal 2, check if the door lock connecting rod moves to the “UNLOCK” position
b、Connect them reversely, check if the door lock connecting rod moves to the
“LOCK” position. If it is not the case, replace the door lock assembly.
3. Circuit Diagram
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