®
16
MBS-1P Installation
Circuit Requirements
The solenoid valves used in the Wabash MBS products allow higher airflow
and require less voltage and current than most trailer ABS systems. For a
nominal 12-volt supply, current consumption is about 1.25 amperes maximum
during ABS activity. Satisfactory operation is available down to 7 volts.
The MBS-1P minimizes trailer issues caused by inadequate voltage (typically
found in 3-trailer units).
Malfunction Lamp Diagnostic Switch
NOTE: The malfunction lamp bulb must be incandescent. Always replace
the bulb with another incandescent bulb of the same value.
A diagnostic switch is located near the ABS malfunction lamp. A malfunction
lamp harness incorporating this switch is included in the MBS-1P kit.
NOTE: While this feature is desirable, it is not essential. Diagnostic flash
codes can also be activated from the tractor cab via the ignition switch.
Figure 10, ABS Malfunction Lamp Installation
322UX026
Malfunction
Lamp Pigtail
Malfunction Lamp
Power Wire
Malfunction Lamp
Diagnostic Switch
Malfunction Lamp
(Must be incandescent)
MBS-1P
Flash Code
Decal
Malfunction Lamp
Mounting Bracket
Trailer Wall
Power
Cable
Connector
Malfunction Lamp
Ground Wire
TO
READ C
URRENT F
AUL
TS
PRESS TW
O
TIMES
(HOLD 2ND
PRESS F
OR
TH
RE
E SECON
DS)
TO
READ ST
ORED F
AUL
T
PRESS THRE
E TIMES
(HOLD 3RD PR
ESS FOR
THREE
SECONDS)
1)
SY
ST
EM
S W
ITH
1
PC
M
DO
N
OT
U
TIL
IZE
FL
AS
H
CO
DE
11
2)
SY
ST
EM
S W
ITH
2
SE
NS
OR
S
DO
N
OT
U
TIL
IZE
FL
AS
H
CO
DE
S
7-1
0 A
ND
S
EN
SO
RS
M
AY
B
E
LO
CA
TE
D
ON
E
ITH
ER
FR
ON
T O
R
RE
AR
A
XL
E
TO
CLEAR ST
ORED
FA
UL
TS
PRESS
F
OUR TIME
S
(HOLD 4TH
P
RESS FOR
THREE SECONDS)
(A
LL
OW
O
NE
S
EC
ON
D
BE
TW
EE
N
PR
ES
SE
S)
X 2
FL
AS
H
TH
RE
E
TI
M
ES
CU
RB
SI
DE
S
EN
SO
R
SI
GN
AL
(F
RO
NT
C
UR
BS
ID
E
ON
4
S
EN
SO
R
SY
ST
EM
S)
X 3
FL
AS
H
FO
UR
TI
M
ES
CU
RB
SI
DE
S
EN
SO
R
CO
NN
EC
TI
ON
(F
RO
NT
C
UR
BS
ID
E
ON
4
S
EN
SO
R
SY
ST
EM
S)
X 4
FL
AS
H
FI
VE
TI
M
ES
RO
AD
SI
DE
S
EN
SO
R
SI
GN
AL
(F
RO
NT
R
OA
DS
ID
E
ON
4
S
EN
SO
R
SY
ST
EM
S)
X 5
FL
AS
H
SI
X
TI
M
ES
RO
AD
SI
DE
S
EN
SO
R
CO
NN
EC
TI
ON
(F
RO
NT
R
OA
DS
ID
E
ON
4
S
EN
SO
R
SY
ST
EM
S
X 6
FL
AS
H
SE
VE
N
TI
M
ES
CU
RB
SI
DE
R
EA
R
SE
NS
OR
S
IG
NA
L
X 7
FL
AS
H
EI
GH
T T
IM
ES
CU
RB
SI
DE
R
EA
R
SE
NS
OR
C
ON
NE
CT
IO
N
X 8
FL
AS
H
NI
NE
TI
M
ES
RO
AD
SI
DE
R
EA
R
SE
NS
OR
S
IG
NA
L
X 9
X 3
X 4
FL
AS
H
TE
N
TI
M
ES
RO
AD
SI
DE
R
EA
R
SE
NS
OR
C
ON
NE
CT
IO
N
X 10
FL
AS
H
EL
EV
EN
TI
M
ES
SE
CO
ND
AR
Y
PC
M
F
AU
LT
X 11
FL
AS
H
TW
EL
VE
TI
M
ES
PR
IM
AR
Y
PC
M
F
AU
LT
X 12
FL
AS
H
FO
UR
TE
EN
TI
M
ES
LO
W
V
OL
TA
GE
TO
A
BS
X 14
FL
AS
H
FI
FT
EE
N
TI
M
ES
EL
EC
TR
ON
IC
C
ON
TR
OL
M
OD
UL
E
X 15
FL
AS
H
CO
DE
Q
UI
CK
R
EF
ER
EN
CE
DI
AG
NO
ST
IC
S
W
IT
CH
IN
PU
T
NO
TE
2S AND 4S SYSTEMS
4S SYSTEMS ONL
Y
DECAL P
ART
NUM
BER:
W
N#25000972
PL
C-
4
TR
U
CK
S
CO
M
PA
TI
BL
E
M
B
S
-1
P
TR
A
IL
ER
A
N
TI
-L
O
C
K
B
R
A
K
E
SY
ST
EM
A
P
R
O
D
U
C
T
O
F
W
A
B
A
SH
N
AT
IO
N
A
L
®
