Dodge ram truck 3500 1996 Service Manual page 231

B R BRAKES 5 - 47
D E S C R I P T I O N AND O P E R A T I O N ( C o n t i n u e d }
• DTC - Diagnostic Trouble Code
• HCU - Hydraulic Control Unit
• ABS - Antilock Brake System
• WSS - Wheel Speed Sensor
RWAL COMPONENT LOCATION
COMPONENT
LOCATION FUNCTION
C O N T R O L L E R A N T I L O C K B R A K E
Center of instrument panel.
Gathers information from various
inputs to control the rear brake
system during an ABS stop. Also, it
monitors the ABS system for proper
operation
DATA L I N K C O N N E C T O R
Located to the right of the steering
column, below the knee blocker.
Provides a means to activate the
CAB's diagnostic trouble code read
out.
H Y D R A U L I C C O N T R O L U N I T
Located under the master cylinder
and is mounted on a bracket with
the combination valve.
Provides modulation of the hydraulic
portion of the rear brakes during an
ABS stop.
R E A R W H E E L S P E E D S E N S O R
Mounted at the top of the rear axle
housing.
Sends an AC voltage sinewave to
the CAB whose frequency is
proportional to vehicle speed.
E X C I T E R R I N G
Attached to the ring gear inside the
differential housing.
Provides a means to pull the
magnetic field across the wheel
speed sensor's windings.
R E D B R A K E W A R N I N G L A M P
Located in the instrument cluster. Provides the driver with a indicator
of park brake engagement,
hydraulic brake malfunction, or ABS
malfunction. Also, is used to identify
any diagnostic trouble codes.
A M B E R A B S W A R N I N G L A M P
Located next to the red brake
warning lamp in the instrument
cluster.
Provides the driver with an indicator
of an ABS malfunction and is used
to identify any diagnostic trouble
codes.
B R A K E W A R N I N G L A M P D I O D E
Located in the instrument panel
harness near the parking brake
switch.
Provides a means to isolate the
park brake switch circuit from the
CAB for proper red brake warning
lamp operation.
I S O L A T I O N A N D D U M P VALVE
F U S E
Located internally to the CAB. Provides a fail-safe device for
unwanted control of the isolation
and dump solenoid/valves
I S O L A T I O N A N D D U M P
S O L E N O I D / V A L V E S
Located internally to the HCU. Provides modulation of the hydraulic
portion of the rear brakes during an
ABS stop.