Esteem GLX Wagon Plus L4-1.8L (1999)
Electronic Brake Control Module: Description and Operation
ABS CONTROL MODULE
ABS control module is installed under the instrument panel at the driver's side.
Its main function is to control ABS hydraulic unit to prevent the wheel from getting locked when braking but it also has a self-diagnosis function and
fail-safe function.
Hydraulic Unit Control (Wheel Speed Control)
ABS control module monitors the speed of each of 4 wheels, deceleration speed of each of 4 wheels and the vehicle deceleration speed through signals
from 4 wheel speed sensors and outputs control signal to each solenoid valve of the hydraulic unit to prevent it from getting locked. Also, it operates
the pump motor all the time while the anti-lock control function is working.
Self-Diagnosis Function
ABS control module diagnoses conditions of the system component parts (whether or not there is any abnormality) all the time and indicates the
results (warning of abnormality occurrence and DTC) through the "ABS" warning lamp and outputs it through the Diag. output terminal as described
below.
1. When ignition switch is turned ON. "ABS" warning lamp lights for 2 seconds to check its bulb and circuit.
2. When no abnormality has been detected (the system is in good condition), "ABS" warning lamp turns OFF after 2 seconds.
3. When the vehicle starts to move after the ignition switch is turned ON (more than one wheel speed sensor signals are input), solenoid valves and
motors of ABS hydraulic unit operate once one after another for electrical check.
During this check, motor operation sound may be heard but that means nothing abnormal.
