Lexus ES300 (2002 year). Manual — part 284
F41940
IG
Battery
I15
Ignition SW
W
B-G
ECU-IG
25
B-R
21
2E
5
2A
2
1
AM1
IG1
AM1
B-Y
2
2G
2
3
FL MAIN
2R
S1
ALT
1
Skid Control ECU
with Actuator
Engine Room R/B
8
IA
4
2A
IG1 Relay
2
8
B-G
1
1
2
B-G
Driver Side J/B
W-B
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
05-265
418
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1241/41 LOW BATTERY POSITIVE VOLTAGE OR
ABNORMALLY HIGH BATTERY POSITIVE
VOLTAGE
CIRCUIT DESCRIPTION
This is the power source for the ECU and hence for the CPU and ABS actuator.
DTC No.
DTC Detection Condition
Trouble Area
C1241/41
Condition 1. or 2. is detected:
1. Vehicle speed is at 3 km/h (1.9 mph) or more and ECU
terminal IG voltage is 9.5 V or less, which continues for
10 sec. or more
2. When IG terminal voltage is less than 9.5 V, there is
open circuit in the motor relay or
in the solenoid relay, or
the solenoid circuit malfunction.
Power source harness and connector
Battery
Charging system
Power source circuit
WIRING DIAGRAM
055XR-02
F41241
ECU-IG
F13038
(+)
(-)
24
25
ON
2
05-266
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
419
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
INSPECT FUSE(ECU-IG OF DRIVER SIDE J/B)
(a)
Remove the ECU-IG fuse from the driver side J/B.
(b)
Check the continuity of the ECU-IG fuse.
OK: Continuity
NG
REPLACE FUSE
OK
2
INSPECT BATTERY(TERMINAL VOLTAGE)
OK: 10 - 14 V
NG
CHECK AND REPLACE CHARGING SYSTEM
OK
3
CHECK VOLTAGE OF ECU IG POWER SOURCE
In case of using the hand-held tester:
(a)
Select the item ”IG VOLTAGE” in the DATA LIST and red its value displayed on the hand-held tester.
(b)
Check the voltage condition output from the ECU and displayed on the hand-held tester.
OK: ”Normal” is displayed.
In case of not using the hand-held tester:
(a)
Disconnect the skid control ECU connector.
(b)
Turn the ignition switch ON.
(c)
Measure the voltage between terminals 25 and 2 or 24 of
the skid control ECU connector.
OK: 10 - 14 V
OK
CHECK AND REPLACE BRAKE ACTUATOR
ASSY
NG
F13039
24
2
LOCK
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
05-267
420
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
CHECK CONTINUITY(GND OF SKID CONTROL ECU CONNECTOR - BODY
GROUND)
(a)
Measure the resistance between terminals 2 and 24 of
the skid control ECU connector and the body ground.
OK: 1
Ω
or less
NG
CHECK AND REPAIR HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE BRAKE ACTUATOR ASSY
F41974
STP
S13
Stop Light SW
2
19
S1
10
G-W
ST+
15
1
W-B
J12
J/C
W
A
7
From Battery
7
2K
2G
2E
G-W
Driver Side J/B
2
Skid Control ECU
with Actuator
BC
BE
2G
G-W
G-W
G-W
R12
Rear Combination
Light LH
2G
13
1
STOP
STOP
R14
Rear Combination
Light RH
3
W-B
1
1
3
ST-
L4
Light Failure Sensor
STOP
G-W
05-268
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
421
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1249/49 OPEN CIRCUIT IN STOP LIGHT SWITCH
CIRCUIT
CIRCUIT DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
C1249/49
ECU terminal IG voltage is 9.5 V to 18.5 V and ABS is in
non-operation, the open circuit of the stop light switch cir-
cuit continues for 0.3 sec. or more.
Stop lamp switch harness and connector
Stop light bulb
Stop light switch circuit
Stop lamp switch
WIRING DIAGRAM
055XS-02
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