Lexus RX300 (MCU15). Service manual — part 263
F13432
Skid Control ECU
Battery
B–Y
AM1
6
1D
4
A
VSCW
IG
7
13
10
W–B
4
2
B–R
A22
8
A23
IG1
GND3
1C
1K
Ignition Switch
HEATER
ECU–IG
J9
Junction
connector
W–G(*2)
W–B
IF1
3
C11
5
R–W
VSC Warning Light
Combination Meter
IG1 AM1
A22
1
C12
W–G(*2)
IJ1
6
W–G(*1)
W–G(*1)
W–L
J/B No. 3
1
3A
3E
5
R–W
6
1C
1
1A
1
2
J/B No. 5
5B
11
5D
1
W–B
5
3
Fusible
Link
Block
ALT
II1
7
W
W
*1 : LHD
*2 : RHD
Instrument Panel J/B
Instrument Panel J/B
IF
17
6
GND1
31
A22
A21
A21
GND2
GND4
W–B
W–B
W–B
W–B
DI–284
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
DTC
Always ON*
Malfunction in ECU
VSC Warning Light Circuit
*: VSC warning light
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
Always ON
S There is a malfunction in the ECU internal circuit.
S Malfunction in power sauce circuit.
S Power source circuit
S VSC warning light circuit
S Charging system
S Skid control ECU
HINT:
If the fail safe function is activated in VSC system, ”VSC” indicator light lights up.
WIRING DIAGRAM
DI1H8–06
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–285
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Is DTC output for VSC?
Check DTC on page DI–205.
YES
Repair circuit indicated by the output code.
NO
2
Does VSC warning light go off?
YES
Check for open or short circuit in harness and
connector between ECU–IG fuse and ECU
(See page IN–32).
NO
3
Check battery voltage.
CHECK:
Check the battery voltage.
OK:
Voltage: 10 – 16 V
NG
Check and repair the charging system (See
page CH–2).
OK
DI–286
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
4
Check operation of the VSC warning light.
In case of using the hand–held tester:
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” and ”OFF” of the VSC warning light can be shown on the combination meter on the hand–
held tester.
In case of not using the hand–held tester:
PREPARATION:
(a)
Turn the ignition switch OFF.
(b)
Disconnect the connector from the skid control ECU.
(c)
Turn the ignition switch ON.
CHECK:
Check the VSC warning light goes off.
OK
Check and replace skid control ECU.
NG
Check for short circuit in harness and connector between combination meter and skid control
ECU, combination meter and DLC3 (See page IN–32).
F13433
Skid Control ECU
WA
13
IE2
ABS
6
C10
21
B–Y
6
Instrument
Panel J/B
GND1
II1
31
17
3A
1K
8
1
2
AM1
IG1
1
IF
Battery
W–B
1
2
W–B
R–W
3E
5
R–W
1
C12
B–Y
5
A23
HEATER
7
AM1
4
B–Y
W–L
Ignition
Switch
J/B No.5
A22
A22
A21
A21
GND2
GND3
GND4
W–B
W–B
W–B
W–B
W–B
W–B
7
J9
J/C
1
11
5B
5D
1C
1A
1C
W
5
3
W
A
IG
6
Fusible
Link
Block
ALT
J/B No.3
Combination Meter
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–287
LEXUS RX300 (RM785E)
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At
this time, the ECU records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the ABS warning light blink and output the DTC.
WIRING DIAGRAM
DI6MN–05
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