Lexus ES300 (1997 year). Manual — part 370
F00105
Battery
MAIN
B–G
F6
F11
1
ALT
FL Block
B–R
STOP
Instrument Panel J/B
1C
1B
4
7
Stop Light
Switch
2
G–W
1R
1S
5
J27
Light Failure
Sensor
J/C
J37
BN
BP
W–B
G–W
A22
12
STP
ABS ECU
R
G–R
High
Mounted
Stop
Light
Right
Stop
Light
Left
Stop
Light
A
1
Instrument
Panel J/B
G–R
W
1
1R
2
4
G–W
G–R
W–B
W–B
W–B
H11
R6
R8
H11
R8
R6
2
1
3
3
1
1
G–W
J/C
A
A
7
2
1
–
DIAGNOSTICS
ANTI–LOCK BRAKE SYSTEM
DI–257
409
1997 LEXUS ES300 (RM511U)
DTC
49
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
49
ABS ECU terminal IG1 voltage is 9.5 V to 18.0 V and ABS
is in non–operation, the open circuit of the stop light switch
circuit continues for 0.3 sec. or more.
Stop light switch
Stop light switch circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check operation of stop light.
CHECK:
Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is released.
NG
Repair stop light circuit (See page
DI0BO–01
W01410
(+)
(–)
STP
DI–258
–
DIAGNOSTICS
ANTI–LOCK BRAKE SYSTEM
410
1997 LEXUS ES300 (RM511U)
OK
2
Check voltage between terminal STP of ABS ECU and body ground.
PREPARATION:
Remove ABS ECU with connectors still connected.
CHECK:
Measure voltage between terminal STP of ABS ECU and body
ground when brake pedal is depressed.
OK:
Voltage: 8 – 14 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
3
Check for open in harness and connector between ABS ECU and stop light
Switch (See page
NG
Repair or replace harness or connector.
OK
Check and replace ABS ECU.
F00112
Engine Room R/B No. 3
Battery
MAIN
B–G
F6
F9
FL
Block
ABS
1
2
3
4
A6
EA
EB
W–B
ABS Actuator
ABS Motor
Relay
ABS ECU
1
ALT
1
3
3
3
W–B
W–B
A6
A6
2
1
3
1
2
3
B–G
W–R
A23
A23
A23
7
8
9
GR–L
GR–R
R–W
MR
R+
MT
–
DIAGNOSTICS
ANTI–LOCK BRAKE SYSTEM
DI–259
411
1997 LEXUS ES300 (RM511U)
DTC
51
ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
51
ABS actuator pump motor is not operating normally.
ABS pump motor
Fail safe function: If trouble occurs in the ABS pump motor, the ECU cuts off current to the ABS solenoid
relay and prohibits ABS control.
WIRING DIAGRAM
DI0BP–01
DI–260
–
DIAGNOSTICS
ANTI–LOCK BRAKE SYSTEM
412
1997 LEXUS ES300 (RM511U)
DTC
Always ON
ABS ECU Malfunction
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
Always ON
ABS ECU internal malfunction is detected.
ECU
Battery
Fail safe function: If trouble occurs in the power source circuit, the ECU cuts off current to the ABS solenoid
relay and prohibits ABS control.
INSPECTION PROCEDURE
1
Is DTC output?
Check DTC on page
YES
Repair circuit indicated by the code output.
NO
2
Is normal code displayed?
YES
Check ABS solenoid relay. Check for short in
harness and connector between ABS solenoid
relay and DLC1 (See page
).
NO
3
Is ABS warning light go off?
YES
Check for open or short in harness and connec-
tor between ECU–IG fuse and ABS ECU
(See page
).
NO
DI0BQ–01
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