Page 809 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-557
750 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1237 / 37 Tires of Different Size
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1237 / 37
Driving at more than 19 mph (30 km/h) for more than 20
seconds with 1 or 2 tires of different size 3 times continu-
ously.Tire size
Skid control ECU
INSPECTION PROCEDURE
1 Check tire size.
CHECK:
Check the size and condition of all 4 wheels.
NG Replace tires so that all 4 tires are of the same
size.
OK
Check and replace skid control ECU.
DIC9M-01
Page 810 of 3115

F17758
Cowl Side J/B LH BatteryEngine Room J/B
Cowl Side J/B LH
Cowl Side J/B RH J4
J/C
Cowl Side J/B LH
IG1 No. 2 Relay
ECU-IG1
AM1
ALT
MAINFL Block
EE IFIG2
IG1
GND4
GND3
GND1
GND2 A44
A42
A42 A42
A41
A41 2A
2B3
13 J/B No. 2
IFF15 F16
2 12C1
2E 2E
2B
3918 37
12
533B 3E22 4IGN2A
2E41 10 1
1C 1B9 AM2
W-R
B-R B-R
B-R B-G
W-R
L-B
B-R
AA
B-G
W-B B-W
W-B
W-B 4
62
7 IG1
AM1
AM2 IG2
W-B
22
6
17
8
31
6 ABS & BA & TRAC
& VSC ECU
W-B
W-B
W-B
W-B
W-B I18
Ignition SW
DI-558- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
751 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1241 / 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1241 / 41
Detection of any of the conditions 1. through 4.:
1. Vehicle speed is 1.9 mph (3 km/h) or more and voltage
of ECU terminal IG remains below 9.5 V for more than
10 sec.
2. While the condition that the solenoid relay is ON contin-
ues, ECU terminal IG1 voltage becomes 9.5 V or less,
and the condition that the contact point of the solenoid
relay is OFF continues for 0.2 sec. or more.
3. The condition that ECU terminal IG1 voltage is more
than 17.0 V continues for 1.2 sec. or more.
4. While the solenoid relay outputs ON signal, ECU termi-
nal IG1 voltage becomes more than 17.0 V, and the
condition that the contact point of the solenoid relay is
OFF continues for 0.2 sec. or more.
Battery
IC regulator
Power source circuit
WIRING DIAGRAM
DIC9N-01
Page 811 of 3115

F09165
GND1GND2
IG1 GND3
GND4
(-)(+) ON
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-559
752 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system.
OK
2 Check voltage of the ECU IG power source.
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 DATALIST mode on the hand-held tester.
CHECK:
Check the voltage condition output from the ECU displayed on the hand-held tester.
OK:
ºNormalº is displayed.
In case of not using the hand-held tester:
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG1 and GND of the
skid control ECU connector.
OK:
Voltage: 10 to 14 V
OK Turn ignition switch OFF, check and replace
skid control ECU.
NG
Page 812 of 3115
F02836
GND1
GND2GND3
GND4
F04448
Driver Side J/B
ECU-IG
DI-560- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
753 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check continuity between terminal GND of skid control ECU connector and body
ground.
CHECK:
Measure resistance between terminal GND of the skid control
ECU connector and body ground.
OK:
Resistance: 1 W or less
NG Repair or replace harness or connector.
OK
4 Check ECU-IG fuse.
PREPARATION:
Remove the ECU-IG fuse from the driver side J/B.
CHECK:
Check continuity of the ECU-IG fuse.
OK:
Continuity
NG Check for short circuit in all the harness and
components connected to ECU-IG fuse (See at-
tached wiring diagram).
OK
Check for open circuit in harness and connector between skid control ECU and battery (See page
IN-36).
Page 813 of 3115
F17758
Cowl Side J/B LH BatteryEngine Room J/B
Cowl Side J/B LH
Cowl Side J/B RH J4
J/C
Cowl Side J/B LH
IG1 No. 2 Relay
ECU-IG1
AM1
ALT
MAINFL Block
EE IFIG2
IG1
GND4
GND3
GND1
GND2 A44
A42
A42 A42
A41
A41 2A
2B3
13 J/B No. 2
IFF15 F16
2 12C1
2E 2E
2B
3918 37
12
533B 3E22 4IGN2A
2E41 10 1
1C 1B9 AM2
W-R
B-R B-R
B-R B-G
W-R
L-B
B-R
AA
B-G
W-B B-W
W-B
W-B 4
62
7 IG1
AM1
AM2 IG2
W-B
22
6
17
8
31
6 ABS & BA & TRAC
& VSC ECU
W-B
W-B
W-B
W-B
W-B I18
Ignition SW
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-561
754 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1242 / 42 IG2 Power Source Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1242 / 42With the vehicle running, open circuit in IG2 is detected for
more than 7 sec.Battery
IC regulator
Power source circuit
WIRING DIAGRAM
DIC9O-01
Page 814 of 3115

F09165
GND1GND2
IG1 GND3
GND4
(-)(+) ON
DI-562- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
755 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system.
OK
2 Check voltage of the ECU IG power source.
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 DATALIST mode on the hand-held tester.
CHECK:
Check the voltage condition output from the ECU displayed on the hand-held tester.
OK:
ºNormalº is displayed.
In case of not using the hand-held tester:
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG2 and GND of the
skid control ECU connector.
OK:
Voltage: 10 to 14 V
OK Turn ignition switch OFF, check and replace
skid control ECU.
NG
Page 815 of 3115
F02836
GND1
GND2
GND3GND4
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-563
756 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check continuity between terminal GND of skid control ECU connector and body
ground.
CHECK:
Measure resistance between terminal GND of the skid control
ECU connector and body ground.
OK:
Resistance: 1 W or less
NG Repair or replace harness or connector.
OK
Check for open circuit in harness and connector between skid control ECU and battery (See page
IN-36).
Page 816 of 3115

F17752
ABS & BA & TRAC
& VSC ECU Y1
Yaw Rate Sensor
ShieldedGL1
GL2
YD
VYS
YAW
GYAW
YSS A43
1827 289 191022
G
Y
L
B
W
R 4
2
6
8
1
5A43
A43
A43
A43
A43
A42 IG4
IG4
IG4
IG4
IG4
IG4
IG416
17
21
19
20
18
22
ShieldedG
Y
L
B
W
R GL1
GL2
YD
VYS
YAW 2
GYAW DI-564
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
757 Author: Date:
2004 LAND CRUISER (RM1071U)
DTCC1243 / 43, C1245 / 45Malfunction in Deceleration Sensor
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1243 / 43
While vehicle speed becomes 0 mph (0 km/h) from 30 km/h
(18 mph), and the condition that GL1 and GL2 signals of ECU
terminals did not change 40 mV or less continued in a
sequence 16 times.
Deceleration sensor
C1245 / 45
At the vehicle speed of 18 mph (30 km/h) or more, and the
condition that the difference between acceleration and decel-
eration values of computation from deceleration sensor and
vehicle speed becomes more than 0.35 G continues for 60
sec. or more.Deceleration sensor
Wire harness for deceleration sensor system
WIRING DIAGRAM
DIC9P-01