Lexus RX300 (MCU15). Manual — part 261
DI–276
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
4
Check for open circuit in harness and connector between skid control ECU and
stop light switch (See page IN–32).
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection on prob-
lem symptoms table (See page DI–220).
F05279
Battery
Fusible Link
Block
ABS
R/B No. 2
ABS
SOL Relay
ABS Motor Relay
Brake Actuator
2
3
W
B
2
2
2
2
2
1
5
3
2
3
W–L
W–B
A7
W–B
W–B
LG–B
B–W
GR
29
A21
MR
MT
Skid Control ECU
EA
ED
1
A21
R+
A21
28
A7
A7
1
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–277
LEXUS RX300 (RM785E)
DTC
C1251 / 51
ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1251 / 51
Either of the following 1. or 2. is detected:
1. Brake actuator pump motor is not operating normally.
2. Open circuit condition of brake actuator pump motor
continues for 2 sec. or more.
ABS pump motor
WIRING DIAGRAM
DI84R–01
F03648
(+)
(–)
BM
GND
DI–278
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check operation of pump motor.
PREPARATION:
Disconnect the connector from the brake actuator.
CHECK:
Connect positive ę lead to BM terminal and negative Ĝ lead
to GND terminal of the brake actuator, check that the pump mo-
tor is operated.
OK:
The running sound of the pump motor should be
heard.
OK
Check for open circuit in harness and connec-
tor between ABS motor relay, brake actuator
and ECU (See page IN–32).
NG
Replace brake actuator.
F13431
14
SS1–
Skid Control ECU
Steering Angle Sensor
LG–B
A23
LG
SS1+
23
A23
SS1–
SS1+
3
6
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–279
LEXUS RX300 (RM785E)
DTC
C1335 / 35
Steering Angle Sensor Communication
Circuit Malfunction
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1335 / 35
When the condition that ECU terminal IG1 voltage is 9.5 V
or more, and ECU does not receive data from steering
angle sensor continues for 1 sec. or more.
Steering angle sensor circuit
WIRING DIAGRAM
DI84S–01
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