Lexus RX300 (MCU15). Manual — part 264
DI–288
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
HINT:
Troubleshoot in accordance with the chart below for each trouble symptom.
ABS warning light does not light up
*1
ABS warning light remains on
*2
*1: Start the inspection from step 1 in case of using the hand–held tester and start from step 2 in case of
not using hand–held tester.
*2: After inspection of step 3, start the inspection from step 4 in case of using the hand–held tester and start
from step 5 in case of not using hand–held tester.
1
Check operation of the ABS warning light.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON and push the hand–held tester main switch ON.
(c)
Select the ACTIVE TEST mode on the hand–held tester.
CHECK:
Check that ”ON” of the ABS warning light can be shown on the combination meter using the hand–held tes-
ter.
OK
Check and replace skid control ECU.
NG
2
Check ABS warning light.
See combination meter troubleshooting on page BE–2.
NG
Repair bulb or combination meter assembly.
OK
3
Check that the ECU connectors are securely connected to the skid control ECU.
NO
Connect the connector to the skid control ECU.
YES
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–289
LEXUS RX300 (RM785E)
Check for open circuit in harness and connector between combination meter and skid control
ECU (See page IN–32).
4
Check operation of the ABS warning light (See step 1).
OK
Check and replace skid control ECU.
NG
5
Is DTC output?
Check DTC on page DI–205.
YES
Repair circuit indicated by the output code.
NO
Check for short circuit in harness and connector between DLC3 and skid control ECU (See page
IN–32).
F13434
Combination Meter
A23 LBL
11
A23
1
R–W
C10
22
1
C12
1
Ignition Switch
AM1
6
2
1
2
9
B–Y
1C
7
3E
5
W–L
A
IG
Brake Fluid Level
Warning Switch
2
4
IJ1
18
A22
15
PKB
Parking
Brake
Switch
Brake
Warning Light
G
G
J/B No.3
BRL
Skid Control ECU
3A
R–W
1K
13
HEATER
Instrument Panel J/B
1
1C
Instrument Panel J/B
Instrument Panel J/B
J9
Junction
Connector
W–B
W–B
1B
1D
14
R–W (*1)
II1
26
R–W (*2)
R–W (*2)
R–L
R–W
J/B No.5
6
5A
3
5E
1
*1 : LHD
*2 : RHD
DI–290
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
Brake Warning Light Circuit
CIRCUIT DESCRIPTION
The brake warning light lights up when the brake fluid is insufficient, the parking brake is applied or the EBD
is defective.
WIRING DIAGRAM
DI6QP–07
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DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–291
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check parking brake switch circuit (See page BE–2).
NG
Repair or replace parking brake switch circuit.
OK
2
Check brake fluid level warning switch circuit (See page BE–2).
NG
Repair or replace brake fluid level warning
switch circuit.
OK
3
Is DTC output for ABS?
Check DTC on page DI–205.
YES
Repair circuit indicated by the output code.
NO
4
Check brake warning light.
See combination meter troubleshooting on page BE–2.
NG
Repair or replace combination meter.
OK
Check and replace Skid control ECU.
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