Page 1022 of 4087
BR0EV±04
HYDRAULIC SYSTEM DIAGRAM
w/o TRAC:
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±53
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Page 1023 of 4087
w/ TRAC:
BR±54±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1024 of 4087
BR0EW±05
WIRING DIAGRAM
w/o TRAC:
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±55
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Page 1025 of 4087
w/ TRAC:
BR±56±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1026 of 4087
BR0EX±01
ECU TERMINALS
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±57
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Page 1027 of 4087
BR±58±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1028 of 4087
![LEXUS SC400 1991 Service Repair Manual
BR0EY±05
ECU TERMINALS STANDARD VALUE
w/o TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\](/manual-img/36/57051/w960_57051-1027.png "LEXUS SC400 1991 Service Repair Manual
BR0EY±05
ECU TERMINALS STANDARD VALUE
w/o TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\")
BR0EY±05
ECU TERMINALS STANDARD VALUE
w/o TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\
\
Condition
BAT
(A23±22)
±
GND
(A23±13)
10±14\
\
\
Always
IG
(A23±11) ± GND
(A23±2) 10±14\
\
IG switch ON
SR
(A22±5)
±
R±
(A22±4)
8.3±14
\
\
\
IG switch ON, ABS warning light OFF
MR
(A22±11)
±
R±
(A22±4)
Below 1.0
\
\
\
IG switch ON
SFR
(A23±1)
±
GND
(A23±2)
10±14
\
\
\
IG switch ON, ABS warning light OFF
SFL
(A22±6)
±
GND
(A23±13)
10±14\
\
\
IG switch ON, ABS warning light OFF
SRR
(A22±12)
±
GND
(A23±13)
10±14\
\
\
IG switch ON, ABS warning light OFF
AST
(A22±8) ± GND
(A23±13) 10±14\
\
IG switch ON, ABS warning light OFF
WA
±
GND
Below 2.0
\
\
\
IG switch ON, ABS warning light ON
WA
(A23±10)
±
GND
(A23±13) 10±14\
\
IG switch ON, ABS warning light OFF
PKB ± GND Below 1.5\
\
IG switch ON, PKB switch ON
PKB
(A23±16) ±
GND
(A23±13) 10±14\
\
IG switch ON, PKB switch OFF
STP
±
GND Below 1.5\
\
Stop light switch OFF
STP
(A23±7) ± GND
(A23±2) 8±14\
\
Stop light switch ON
D/G
(A23±21)
±
GND
(A23±13)
10±14
\
\
\
IG switch ON, ABS warning light OFF
Tc
(A23±17)
±
GND
(A23±13)
10±14
\
\
\
IG switch ON
Ts
(A23±6)
±
GND
(A23±2)
10±14\
\
\
IG switch ON
FR+
(A22±1)
±
FR±
(A22±7)
AC generation\
\
\
IG switch ON
Slowly turn right front wheel
FL+
(A22±3) ± FL±
(A22±10) AC generation\
\
IG switch ON
Slowly turn left front wheel
RR+
(A23±19)
±
RR±
(A23±20)
AC generation
\
\
\
IG switch ON
Slowly turn right rear wheel
RL+
(A23±14)
±
RL±
(A23±3)
AC generation
\
\
\
IG switch ON
Slowly turn left rear wheel
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±59
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Page 1029 of 4087
![LEXUS SC400 1991 Service Repair Manual
w/TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\
\
Condition](/manual-img/36/57051/w960_57051-1028.png "LEXUS SC400 1991 Service Repair Manual
w/TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\
\
Condition")
w/TRAC:
Symbols
(Terminals No.)
STD Voltage (V)\
\
\
Condition
BAT
(A25±21)
±
GND
(A25±22)
10±14\
\
\
Always
IG
(A24±24)
±
GND
(A25±22)
10±14\
\
\
IG switch ON
SR
(A24±22) ± R±
(A24±25) 8.3±14\
\
IG switch ON, ABS warning light OFF
MR
(A25±16)
±
R±
(A24±25)
Below 1.0
\
\
\
IG switch ON
TSR
(A24±1)
±
R±
(A24±25)
8.3±14
\
\
\
IG switch ON, TRAC indicator light OFF
TMR
(A24±9)
±
R±
(A24±25)
Below1.0
\
\
\
IG switch ON
SFR
(A25±1)
±
GND
(A25±2)
10±14\
\
\
IG switch ON, ABS warning light OFF
SFL
(A24±13)
±
GND
(A25±22)
10±14\
\
\
IG switch ON, ABS warning light OFF
SRR
(A24±26) ±
GND
(A25±22)
10±14\
\
IG switch ON, ABS warning light OFF
SRL
(A25±12)
±
GND
(A25±13)
10±14
\
\
\
IG switch ON, ABS warning light OFF
AST
(A24±8)
±
GND
(A25±22)
10±14
\
\
\
IG switch ON, ABS warning light OFF
SAC
(A24±12)
±
GND
(A25±22)
10±14
\
\
\
IG switch ON, TRAC indicator light OFF
SMC
(A24±2)
±
GND
(A25±22)
10±14\
\
\
IG switch ON, TRAC indicator light OFF
SRC
(A24±15)
±
GND
(A25±22)
10±14\
\
\
IG switch ON, TRAC indicator light OFF
PR
(A24±10)
±
E2
(A24±20)
5±7\
\
\
IG switch ON
VC
(A24±19) ± E2
(A24±20) 4±6\
\
IG switch ON
ALT
±
GND
Below 1.0\
\
\
IG switch ON
ALT
(A25±8)
±
GND
(A25±22) 10±14\
\
Idling
WA ± GND Below 2.0\
\
IG switch ON, ABS warning light ON
WA
(A25±9) ±
GND
(A25±22) 10±14\
\
IG switch ON, ABS warning light OFF
PKB
±
GND
Below 1.5\
\
\
IG switch ON, PKB switch ON,
Fluid in M/C reservoir above MIN level
PKB
(A25±17)
±
GND
(A25±22)
10±14\
\
\
IG switch ON, PKB switch OFF,
Fluid in M/C reservoir above MIN level
BR±60±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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