Page 879 of 3115
F17759
INFR Combination Meter
Cowl Side J/B RH
Engine Room J/B
Cowl Side J/B LHI18
Ignition SW
FL Block
MAIN TRAC15
A43 IG1 IU4
C13 C12
MET
AM2
9 1
F15 3E 3Q
1C1B
2A2E IG2AM2
Battery SB
B-R B-R
B-R B-R SB
W-R
21041 6
7 A AJ4
J/C
B-GABS & BA & TRAC
& VSC ECU
W-R 13 13 18 10
74 DI-642
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
835 Author: Date:
2004 LAND CRUISER (RM1071U)
TRAC Indicator Light Circuit
CIRCUIT DESCRIPTION
The TRAC indicator light blinks during TRAC operation.
WIRING DIAGRAM
DICA9-02
Page 880 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-643
836 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Do the warning lights other than TRAC indicator light come on?
YES Go to step 3.
NO
2 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 881 of 3115
DI-644- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
837 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check TRAC indicator light.
Check that the open circuit in the combination meter circuit (See page BE-58).
NG Repair TRAC indicator light bulb or combina-
tion meter assembly.
OK
4Check for short circuit in harness and connector between TRAC indicator light and skid
control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and repair skid control ECU.
Page 883 of 3115
AB0119S08096F00446
E1
Ts DLC1 ON
(-)
(+)
DI-654- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
847 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals Ts and E
1 of the
DLC1.
OK:
Voltage: 10 to 14 V
OK If ABS warning light does not blink even after Ts
and E
1 are connected, the ECU may be defec-
tive.
NG
2 IG switch OFF, and check for open and short circuit in harness and connector
between skid control ECU and DLC1, DLC1 and body ground (See page IN-36
).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
Page 884 of 3115
F17756
ABS & BA & TRAC
& VSC ECU
Cowl Side J/B RH Cowl Side J/B RH
Cowl Side J/B RH
I18
Ignition SW
Engine Room J/BCowl Side J/B LHCombination Meter
Cowl Side J/B LH
IG1 No.2 Relay
J/B No.2
MAIN
FL Block ECD4 Detection SW
(Center Diff. Lock)
BatteryVSC OFF
IFEC EXI
IG2
IG1
WT A43
A44
A42
A43 IX1
IGN
MET
IG1
AM2
AM1 ECU-IG1
ALTP-B
B-R
B-W
L-R
SB
BR SB
IX1
W-R B-R
SB
B-R
B-R L-B
B-R W-R
W-R
B-G
B-G3
A
AJ4
J/C
C15
C12
C13 3E
3B
3Q3Q
3B
3Q 3B
1C 1B 2A 2E
2E
2E 2B
2C
F1522
6
7 26
14 56
3 SB2
P-B
422
7
2
74
6
1910 41
2
1
5 37
18
391
217 101 W-B
IG2 AM1
AM28 2 1
3
F161
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-645
838 Author: Date:
2004 LAND CRUISER (RM1071U)
VSC OFF Indicator Light, Center Diff Lock Switch Circuit
CIRCUIT DESCRIPTION
This is the VSC control main switch. When the center differential is locked, VSC control goes off and the VSC
OFF indicator light lights up.
WIRING DIAGRAM
DICAA-02
Page 885 of 3115
DI-646- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
839 Author: Date:
2004 LAND CRUISER (RM1071U)
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 VSC OFF indicator light.
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 VSC OFF indicator light can be shown on the combination meter with the
hand-held tester.
NG Go to step 3.
OK
2 Is DTC output for VSC?
YES Repair circuit indicated by the output code.
NO
3 Does the warning lights other than VSC OFF indicator light come on?
YES Go to step 5.
NO
Page 886 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-647
840 Author: Date:
2004 LAND CRUISER (RM1071U)
4 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).
5 Check VSC OFF indicator light.
Check that the open circuit in the combination meter circuit (See page BE-58).
NG Repair VSC OFF indicator light bulb or combina-
tion meter assembly.
OK
Page 887 of 3115
DI-648- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
841 Author: Date:
2004 LAND CRUISER (RM1071U)
6Check for short circuit in harness and connector between VSC OFF indicator light and
skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
7 Check if center diff. lock switch remains ON, or check wire harness between cen-
ter diff. lock switch and body ground for short circuit.
NG Repair center diff. lock switch or repair or re-
place wire harness.
OK
Check and repair skid control ECU.
