Page 764 of 3115
F17763
EXI
WT A43
A43 IX1
F15Cowl Side J/B RH
Cowl Side J/B RH Cowl Side J/B RH
Cowl Side J/B LHI18
Ignition SW
Engine Room J/BCombination MeterABS & BA & TRAC
& VSC ECU
SB
D4
Detection SW
(Center Diff. Lock)
2
W-B
P-B
SB
SB
SB MET1
2
47
3E3Q
56 3
3Q
3B
3Q3B J4
J/C
B-R B-R
A
AP-B
L-R
W-R AM2 IG2
76
41 10
2E 2A
1
9
1C1B
2 B-G
ECFL Block
Battery MAIN
EC BR W-R8IX1
VSC OFF
17
C13 C12 C151
103
7
14 26
AM2 DI-624
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
817 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC Always ON Malfunction in ECU
VSC TRAC Warning Light Circuit
CIRCUIT DESCRIPTION
Always ONThere is a malfunction in the ECU internal circuit.
Power source circuit
Skid control ECU
VSC TRAC warning light circuit
HINT:
If the fail safe function is activated in the VSC system, ºVSC OFFº indicator light lights up.
WIRING DIAGRAM
DICA4-01
Page 765 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-625
818 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 for VSC?
Check the DTC on page DI-505.
YES Repair circuit indicated by the output code.
NO
3 Does VSC TRAC 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 16 V
NG Check and repair the charging system.
OK
Page 766 of 3115
DI-626- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
819 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check operation of the VSC TRAC 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 VSC TRAC warning light can be shown on the combination meter on 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) Turn the ignition switch ON.
CHECK:
Check that the VSC TRAC warning light goes off.
NG Check and replace combination meter (See
page BE-2).
OK
6Check 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 767 of 3115
F17718F18533
ABS & BA & TRAC
& VSC ECU
Engine Room J/B Combination Meter
Cowl Side J/B RH
Cowl Side J/B LH
I18
Ignition SW
Cowl Side J/B RHWA 1
A42 4
3A 5
3Q 12
C12
41
2E10
2A
1B91
1C AM2
W-RB-R
C12
C15
ECSB
BR8
IX1 3Q SB7MET
4
3EB-R
B-G
FL Block SB R-L
W-R
76AM2 IG2
J4
J/C
AA
2
F15Battery 1 10
MAIN ABS
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-627
820 Author: Date:
2004 LAND CRUISER (RM1071U)
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At
this time, the ECU records a DTC in memory.
Connect terminals Tc and E
1 of the DLC1 or Tc and CG of DLC3 to make the ABS warning light blink and
output the DTC.
WIRING DIAGRAM
DICA5-02
Page 768 of 3115
DI-628- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
821 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Troubleshoot in accordance with the table below for each trouble symptom.
ABS warning light does not light up*1
ABS warning light remains on*2
*1: 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.
*
2: After inspection with step 4, start the inspection from step 5 in case of using the hand-held tester and
start from step 6 in case of not using hand-held tester.
1 Check operation of the ABS warning 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 ABS warning light can be shown on the combination meter on the hand-
held tester.
OK Check and replace skid control ECU.
NG
2 Does the warning lights other than ABS warning light come on?
YES Repair ABS warning light bulb or combination
meter assembly.
NO
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 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.
