1991 LEXUS SC400 Service Repair Manual

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Page 1025 of 4087

LEXUS SC400 1991 Service Repair Manual
w/ TRAC:
BR±56±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1026 of 4087

LEXUS SC400 1991 Service Repair Manual
BR0EX±01
ECU TERMINALS
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±57
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Page 1027 of 4087

LEXUS SC400 1991 Service Repair Manual
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)\ \ $

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 $

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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Page 1030 of 4087

$LEXUS SC400 1991 Service Repair Manual Symbols (Terminals No.) STD Voltage (V)\ \ \ Condition LBL (A25�$

Symbols
(Terminals No.)

STD Voltage (V)\

\

\

Condition
LBL
(A25±6) ± GND
(A25±22) 10±14\
\
IG switch ON
Fluid in M/C reservoir tank above MIN level.

STP

±

GND

Below 1.5\

\

\
Stop light switch OFF

STP
(A25±10)
±

GND
(A25±22)

8±14
\

\

\
Stop light switch ON
D/G
(A25±20) ± GND
(A25±22) 10±14\
\
IG switch ON, ABS warning light OFF

Tc
(A26±3)

±

GND
(A25±22)

10±14
\

\

\
IG switch ON

Ts
(A26±1)

±

GND
(A25±22)

10±14
\

\

\
IG switch ON
P
±
GND 10±14\
\
IG switch ON, Shift position in ªPº position P
(A26±10) ± GND
(A25±22) Below 1.5\
\
IG switch ON, Other shift position in ªPº position

N

±

GND
(A25±22)

10±14
\

\

\
IG switch ON, Shift position in ªNº position

N
(A26±5) ± (A25±22) Below 1.5\
\
IG switch ON, Other shift position in ªNº position

FR+
(A24±17)
±

FR±
(A24±4)

AC generation\

\

\

IG switch ON
Slowly turn right front wheel.

FL+
(A24±5)
±

FL±
(A24±18)

AC generation\

\

\

IG switch ON
Slowly turn left front wheel.

RR+
(A25±14)
±

RR±
(A25±3)

AC generation\

\

\

IG switch ON
Slowly turn right rear wheel.
RL+
(A25±4) ± RL±
(A25±15) AC generation\
\
IG switch ON
Slowly turn left rear wheel.

FRO
(A26±15)

±

GND
(A25±22)

Pulse generation
\

\

\
IG switch ON
Slowly turn right front wheel.

FLO
(A26±6)

±

GND
(A25±22)

Pulse generation
\

\

\
IG switch ON
Slowly turn left front wheel.

RRO
(A26±13)

±

GND
(A25±22)

Pulse generation
\

\

\

IG switch ON
Slowly turn right rear wheel.

RLO
(A26±4)
±

GND
(A25±22)

Pulse generation\

\

\

IG switch ON
Slowly turn left rear wheel.
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±61
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Page 1031 of 4087

LEXUS SC400 1991 Service Repair Manual
BR0EZ±03
ABS ACTUATOR
ABS ACTUATOR REMOVAL AND
INSTALLATION
Remove and install the parts, as shown.
BR±62
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
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Page 1032 of 4087

LEXUS SC400 1991 Service Repair Manual
MAIN POINT OF REMOVAL AND
INSTALLATION
1. w/ TRAC:DRAIN OUT HIGH PRESSURE FLUID
(a) Connect a vinyl t ube to the TRAC actuator bleeder plug, then
loosen the bleeder plug.
(b) When the fluid has fl

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