Dodge RAM TRUCK 1500 1995 Service Manual page 626

8W-32 ANTI-LOCK BRAKES 8W - 32 - 1
ANTI-LOCK BRAKES
C O N T E N T S
page
ALL WHEEL ANTI-LOCK BRAKE SYSTEM (ABS) .. 3
GENERAL INFORMATION
This section of the wiring diagrams is divided into
two sub-sections; one for the Rear Wheel Anti-Lock
(RWAL) system and one for the all wheel Anti-Lock
page
REAR WHEEL ANTI-LOCI (RWAL) 1RAIES . . . 1
Brake System (ABS). When referring to the circuit
descriptions or wiring diagrams, ensure that you use
the ones for the appropriate system.
R E A R W H E E L
A N T I - L O C K
(RWAL) B R A K E S
INDEX
page
Brake Warning Lamp Switch Input 2
Data Link Connector . 2
Diagram Index —Rear Wheel Anti-Lock Brakes . . . . .
2
Four-Wheel Drive Switch Sense . . . . . . . . . . . . . . .
2
General Information . . . . . . . . . . . . . . . . . . . . . . . . 1
Park Brake Switch Input
2
GENERAL INFORMATION
Power for the Rear Wheel Anti-Lock (RWAL) con­
trol module is supplied on circuit A20. This circuit is
connected to the fuse Mock and protected by a 20
amp fuse located in cavity 14. Power for the fuse is
supplied on circuit A22 from the ignition switch. This
circuit is HOT in the START/RUN position only.
Power for the A22 circuit is supplied by circuit A2.
This circuit originates at the Power Distribution Cen­
ter (PDC) and is protected by a 40 amp fuse located
in cavity 2.
Four fuses supply power for the Rear Wheel Anti-
Lock (RWAL) Brake System. They are fuses 2, and 6
in the Power Distribution Center (PDC), and fuses 14
and 20 in the fuse block. Fuses 2 and 6 in the PDC,
and fuse 20 in the fuse block are connected directly
to battery voltage and are HOT all times. Fuse 14 in
the fuse block is HOT when the ignition switch is the
RUN Position.
In the RUN position, the ignition switch connects
circuit A2 from a 40 amp fuse in cavity 2 of the PDC
with circuit A22. Circuit A22 connects to a bus bar in
the fuse block. The bus bar feeds circuit A20 through
fuse 14. Fuse 14 is a 20 amp fuse.
page
Rear Anti-Lock Valve 2
Rear Wheel Speed Sensor 1
Stop Lamp Switch Input 2
Vacuum Switch . 2
Warning Lamp 2
On diesel engines circuit A20 is double crimped at
cavity 3 of the RWAL control module and provides
battery voltage to the vacuum switch.
Circuit F32 provides battery voltage to the RWAL
module. Circuit F32 is HOT at all times. Fuse 20 in
the fuse block protects circuit F32. Circuit A3 from
the PDC feeds the fuse block bus bar that powers
fuse 20 and circuit F32. Fuse 6 in the PDC protects
circuit A3. Circuit Z3 provides ground for the RWAL
control module.
REAR WHEEL SPEED SENSOR
The rear wheel speed sensor is mounted on the top
of the rear axle differential. The sensor converts
wheel speed into an electrical signal that it transmits
to the Rear Wheel Anti-Lock (RWAL) control module.
Circuits B113 and B114, a pair of twisted wires
connect to the sensor to provide signals to the ABS
control module. These circuits also connect to the
rolls test connector used during manufacture of the
vehicle.
Circuit B113 connects to cavity 18 of the RWAL
module. Circuit B114 connects to cavity 9 of the
RWAL module.