Page 777 of 3115
DI-636- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
829 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check parking brake switch circuit (See page BE-63).
NG Repair or replace parking brake switch circuit.
OK
2 Check brake fluid level warning switch circuit (See page BE-63).
NG Repair or replace brake fluid level warning
switch circuit.
OK
3 Is DTC output for ABS?
YES Repair circuit indicated by the output code.
NO
4 Do the warning lights other than BRAKE warning light come on?
YES Go to step 6.
NO
Page 778 of 3115
F00044
1
2
3 4
(+) (-) Continuity1 2
3 4
1
2
3 4 Open
Continuity
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-637
830 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check IG1 No. 1 relay.
PREPARATION:
Remove the IG1 No. 1 relay from the engine room J/B.
CHECK:
Check continuity between the IG1 No. 1 relay terminals listed
in the table below.
OK:
Terminals 3 and 4Continuity
Terminals 1 and 2Open
CHECK:
(a) Apply battery positive voltage between terminals 3 and 4.
(b) Check continuity between terminals.
OK:
Terminals 1 and 2Continuity
NG Replace IG1 No. 1 relay.
OK
Check for open circuit in harness and connector between IG1 No. 1 relay and combination meter
(See page IN-36).
6 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
Page 779 of 3115
DI-638- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
831 Author: Date:
2004 LAND CRUISER (RM1071U)
7 Check BRAKE warning light.
Check if that the open circuit in the combination meter circuit (See page BE-58).
NG Repair brake warning light bulb or combination
meter assembly.
OK
8Check for short circuit in harness and connector between brake warning light and skid
control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and repair skid control ECU.
Page 780 of 3115
DI-528- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
721 Author: Date:
2004 LAND CRUISER (RM1071U)
DTCC0226 / 21 - C0256 / 24ABS Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
C0226 / 21Open or short in SFRH or SFRR circuit continues for 0.015
sec. or more.Hydraulic brake booster
SFRH or SFRR circuit
C0236 / 22Open or short in SFLH or SFLR circuit continues for 0.015
sec. or more.Hydraulic brake booster
SFLH or SFLR circuit
C0246 / 23Open or short in SRRH or SRRR circuit continues for 0.015
sec. or more.Hydraulic brake booster
SRRH or SRRR circuit
C0256 / 24Open or short in SRLH or SRLR circuit continues for 0.015
sec. or more.Hydraulic brake booster
SRLH or SRLR circuit
DIC95-01
Page 781 of 3115
F17705
SFLH
SFLR
SFRH
SFRR
SRLH
SRLR
SRRH
SRRR
AST
BS
BatterFL Block
MAINABS No.1 ABS
SOL Relay Engine Room R/B ABS & BA & TRAC
& VSC ActuatorABS & BA & TRAC
& VSC ECU
SFLH
SFLR
SFRH
SFRR
SRLH
SRLR
SRRH
SRRR
AST A398
A4121
A44 16 A39
A39
A39
A39
A39
A39
A39
A38
A37A41
A41
A41
A41
A41 7
10
9
4
3
2
1
1
47
8
7
1
9 8
6
19
1 A44
A44
A44
A44 Y
B-Y
LG
B-W
R-W
R-Y
G-Y
P
B-R L-BB-O R-G
W
1
11
1 1
1
1 1 3
6
4
2 Engine Room J/B and
Engine Room R/B
1C B-R
F152SR
R1+
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-529
722 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
Page 782 of 3115
F02855
LOCK
A43A45
4
1 2
3
4
10
9
87
DI-530- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
723 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check hydraulic brake booster solenoid.
PREPARATION:
Disconnect the 2 connectors from the hydraulic brake booster.
CHECK:
Check continuity between terminals A43 - 4 and A45 - 1, 2, 3,
4, 7, 8, 9 and 10 of the hydraulic brake booster connector.
OK:
Continuity
HINT:
Resistance of each solenoid at 20 °C (68 °F):
SFRH, SFLH, SRRH, SRLH: 6.95 to 7.45 W
SFRR, SFLR, SRRR, SRLR: 2.00 to 2.40 W
NG Replace hydraulic brake booster.
OK
2 Check for open and short circuit in harness and connector between skid control
ECU and actuator (See page IN-36).
NG Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection. If the connections are normal, the ECU may be defective.
Page 783 of 3115

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-531
724 Author: Date:
2004 LAND CRUISER (RM1071U)
DTCC0278 / 11, C0279 / 12ABS Solenoid Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
C0278 / 11
Conditions 1. and 2. continue for 0.2 sec. or more:
1. ECU terminal IG1 voltage is 9.5 V to 17.0 V and the
solenoid relay is ON, however, the contact point of the
solenoid relay is OFF.
2. With solenoid relay ON, ECU terminal IG1 voltage be-
comes 9.5 V or less and the contact point of the sole-
noid relay does not become ON.
ABS solenoid relay
ABS solenoid relay circuit
C0279 / 12
Immediately after ECU terminal IG1 becomes ON, and
solenoid relay is OFF, however, when the condition that
the solenoid relay due to the contact point is ON continues
for 0.2 sec. or more.
WIRING DIAGRAM
Refer to DTC C0226/21 on page DI-528.
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
1 Check ABS solenoid relay operation.
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 the operation sound of the ABS solenoid relay when operating it with the hand-held tester.
OK:
The operation sound of the ABS solenoid relay should be heard.
OK Go to step 6.
NG
DIC98-02
Page 784 of 3115

F04447
(-) (+) 1
2
Engine Room J/B
F00042
1 34
6 Open
(+)(-)1 2 3
4
4 5 6
1 2
3
2 5 6
5 Continuity
ContinuityContinuity
Open
DI-532- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
725 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check voltage between terminals 1 and 2 of engine room J/B (for ABS solenoid
relay).
PREPARATION:
Remove the ABS solenoid relay from the engine room J/B.
CHECK:
Measure the voltage between terminals 1 and 2 of the engine
room J/B (for ABS solenoid relay).
OK:
Voltage: 10 to 14 V
NG Check and repair harness or connector.
OK
3 Check ABS solenoid relay.
CHECK:
Check continuity between each terminal of the ABS solenoid
relay.
OK:
Terminals 4 and 6Continuity
(Reference value 80 W)
Terminals 2 and 3Continuity
Terminals 1 and 3Open
CHECK:
(a) Apply battery positive voltage between terminals 4 and 6.
(b) Check continuity between each terminal of the ABS sole-
noid relay.
OK:
Terminals 2 and 3Open
Terminals 1 and 3Continuity
NG Replace ABS solenoid relay.
OK