Reatta V6-231 3.8L VIN C SFI (1990)
ABS Main Relay: Description and Operation
The main relay provides switched battery power to the EBCM. Switched battery power is turned on only after the EBCM receives an ignition enable
input signal. If the main relay is not energized, anti-lock braking is disabled. The EBCM energizes the main relay by providing 12 volts at the main relay
enable output. The main relay is disabled if a fault in the anti-lock brake system is detected.
SOLENOID VALVES
Each brake circuit is equipped with two non-serviceable solenoid valves for fluid inlet and outlet. These valves are actuated by a 12 volt signal from
the EBCM when in the anti-lock mode. The valves act individually or in combination to increase, hold or decrease pressure as required to prevent wheel
lockup. During normal braking (not in anti-lock mode), no voltage is provided to the valves. The inlet valve is normally open and the outlet valve is
normally closed.
MAIN VALVE SOLENOID
The main valve solenoid is located in the hydraulic unit and is switched on by the EBCM only when anti-lock braking is required. During anti-lock
braking, the EBCM provides 12 volts to the main valve solenoid output.
ANTI-LOCK LAMP GROUND
When a fault in the anti-lock brake system is detected by the EBCM, the anti-lock lamp output is grounded, turning on the anti-lock lamp in the
instrument panel cluster.
