Page 769 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-629
822 Author: Date:
2004 LAND CRUISER (RM1071U)
3 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).
Page 770 of 3115
DI-630- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
823 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
5 Check operation of the ABS warning light (See step 1).
OK Check and replace skid control ECU.
NG
6 Is DTC output?
Check the DTC on page DI-505.
YES Repair circuit indicated by the output code.
NO
7Check for short circuit in harness and connector between ABS 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 771 of 3115

F17750F18532
ABS & BA & TRAC
& VSC ECU Cowl Side J/B RH Combination Meter
Cowl Side J/B RH
Engine Room J/B
Cowl Side J/B LH
Cowl Side J/B LH
I18
Ignition SW
FL Block
Cowl Side J/B LHWA
IG2 A42
A44 R-L
3A4
3Q5
SB
C1212
ABS
10
C12
C15 1
SB
IX1 8
BR
EC
IFIF EEW-B
3
2A
2B 13
A416 A4131 A428 A4217 A426
GND4
GND3
GND1
GND2 3Q7
3B 22MET
IGN
3E4
B-R
A
A J4
J/C
B-R
6
4 7
2AM2 IG2
AM1IG1
B-W B-RL-B
2E37
2B 18
2E39 ECU-IG1 2
3
5 1IG1 No.2 Relay
2C1
B-G
F161
B-G
F152J/B No.2ALT
MAIN
BatteryW-R
2A10
2E 41 1C1AM2
1B9B-R
SB
AM11
22
IG1
W-B
W-B
W-B
W-B
W-B
W-R
W-B
W-B
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-621
814 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC Always ON Malfunction in ECU
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Always ON
Either of the following 1. or 2. is detected:
1. The ECU connectors are disconnected from the ECU.
2. There is a malfunction in the ECU internal circuit.Battery
IC regulator
Power source circuit
Skid control ECU
HINT:
The hand-held tester may not be used when the ECU is abnormal.
WIRING DIAGRAM
DICA3-01
Page 772 of 3115
DI-622- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
815 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
2 Is DTC output?
Check the DTC on page DI-505.
YES Repair circuit indicated by the output code .
NO
3 Does ABS warning light go off?
YES Check for open or short circuit in harness and
connector between ECU-IG fuse and ECU (See
page IN-36).
NO
4 Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system.
OK
Page 773 of 3115

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-623
816 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check operation of the ABS 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 ºONº and ºOFFº of the ABS warning light can be shown on the combination meter by 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) Using a service wire, connect terminal WA of the skid control ECU harness side connector and body
ground.
(d) Turn the ignition switch ON.
CHECK:
Check that the ABS warning goes off.
OK Check and replace combination meter (See
page BE-2).
NG
6 Check for short circuit in harness and connector between combination meter
and skid control ECU, combination meter and DLC1 (See page
IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
Page 774 of 3115

F09989
ABS & BA & TRAC
& VSC ECU
V8
VSC Warmning Buzzer Cowl Side J/B LH
ECU-IG1
BZ A422
L B-W
21 2B 18
Buzzer
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-649
842 Author: Date:
2004 LAND CRUISER (RM1071U)
Brake Warning and VSC Buzzer Circuit
CIRCUIT DESCRIPTION
The brake warning and VSC buzzer sounds while the accumulator pressure is abnormally low or an ab-
normality casing low fluid pressure occurs VSC is activated.
WIRING DIAGRAM
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 operation of the brake warning and VSC buzzer.
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 brake warning and VSC buzzer sounds ºONº and ºOFFº with the hand-held tester.
OK Check and replace skid control ECU.
NG
DICAB-01
Page 775 of 3115
F02192
1
2 (+) (-)
DI-650- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
843 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check brake warning and VSC buzzer.
PREPARATION:
Disconnect the brake warning and VSC buzzer connector.
CHECK:
Apply battery positive voltage to terminals 1 and 2 of the brake
warning and VSC buzzer connector. Check that the brake warn-
ing light comes on and the VSC buzzer sounds.
NG Replace brake warning and VSC buzzer.
OK
3 Check for open and short circuit in harness and connector between skid control
ECU and brake warning and VSC buzzer (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
Page 776 of 3115
F16083
Cowl Side J/B RH
I18
Ignition SW ABS & BA
& TRAC
& VSC Actuator
Cowl Side J/B LH
Engine Room J/B
F15
FL Block
AM2
P8
Parking
Brake
SW Battery BrakeBRL A435
Y-G
3A 11
3Q6
SB
3E4 MET
3Q7
SB C1419
C1210
C151
C1420
2B20IX1
A A
A4213 2Q36
A40
LBL2
Y-G
2KR-W 27AM2 2A10
1B9
EC 2
MAIN6
IG2J4
J/CB-R Combination Meter
1 W-R
B-G
BR 8
SBSB
2E
2B41
4SB
7
PKB
R-W
1C1W-R
B-RABS & BA & TRAC
& VSC ECU
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-635
828 Author: Date:
2004 LAND CRUISER (RM1071U)
BRAKE Warning Light Circuit
CIRCUIT DESCRIPTION
The BRAKE warning light lights up while the brake fluid is insufficient and EBD is abnormal.
WIRING DIAGRAM
DICA7-02