77
Vehicle Dynamics and Driver Assist Systems
May 2017
The H/U contains a valve relay and motor relay to control the power supplies to the motor pump
and solenoid valves. Operation of the valve and motor relays are controlled by the VDCCM. The
control signals and voltages for the valve and motor relays can be monitored with the Subaru
Select Monitor (SSM)
Note: When errors occur in the VDC system, the valve and motor relays are turned off
to retain normal braking functions. During that time, the brake and VDC related
warning lights should illuminate and no VDC related functions will be possible.
H/U SSM Data
The H/U utilizes the inlet and outlet solenoids to control each wheel independently. Aside from
normal braking, the ON and OFF combinations of these solenoids produces three modes of
operation; Pressure Increase, Pressure Decrease, and Pressure Hold.
B310
1
14
7
2
23
3
VDC-03
VDC-03
*
1
C
B
W
GY
RY
WR
VDC CM
YAW RATE &
G SENSOR
SECONDARY
SUCTION
SECONDARY
CUT
PRIMARY
CUT
PRIMARY
SUCTION
RR OUTLET
VALVE RELAY
MOTOR RELAY
SOLENOID
VALV E
RR INLET
RL OUTLET
RL INLET
FR OUTLET
FR INLET
FL OUTLET
FL INLET
B
H/U Diagrams
3-56
3-55
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