1998 TOYOTA LAND CRUISER relay

DI-588- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
781 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 3, in case of not
using hand-held tester.
1 Check ABS motor 1 and ABS motor 2 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 motor relays individually when operating it with the hand-held tester.
OK:
The operation sound of the ABS motor 1 relay and ABS motor 2 relay should be heard.
NG Go to step 3.
OK
2 Check for short circuit (to B+) in harness and connector between MT of hydrau-
lic brake booster and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.

F04446
(+)
(-) Engine Room J/B
11
ABS
Motor2
Relay
ABS Motor1 Relay
F00044
1
2
3 4
(+) (-) Continuity1 2
3 4
1
2
3 4 Open
Continuity
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-589
782 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3 Check voltage between terminal 1 of engine room J/B (for ABS motor 1 relay and
ABS motor 2 relay) and body ground.
PREPARATION:
Remove the ABS motor 1 relay and ABS motor 2 relay from the
engine room J/B.
CHECK:
Measure voltage between terminal 1 of the engine room J/B (for
ABS motor 1 relay and ABS motor 2 relay) and body ground.
OK:
Voltage: 10 to 14 V
NG Check and repair harness or connector.
OK
4 Check ABS motor 1 relay and ABS motor 2 relay.
PREPARATION:
Remove the ABS motor 1 relay and ABS motor 2 relay from the
engine room J/B.
CHECK:
Check continuity between the motor relay terminals listed in the
table below.
OK:
Terminals 3 and 4Continuity
(Reference value *1)
Terminals 1 and 2Open
*1: ABS motor 1 relay: 54 W
ABS motor 2 relay: 62 W
CHECK:
(a) Apply battery positive voltage between terminals 3 and 4.
(b) Check continuity between terminals.
OK:
Terminals 1 and 2Continuity

F02840
ABS Motor 1
Relay
2
2ABS
Motor 2
Relay
Motor Relay322
3
ECU7
MT
DI-590- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
783 Author
: Date
:
2004 LAND CRUISER (RM1071U)
NG Replace ABS motor 1 relay or ABS motor 2
relay.
OK
5 Check continuity between terminal MT of the ABS & BA & TRAC & VSC ECU and
terminals BM1 and BM2, respectively.
PREPARATION:
Disconnect the 2 connectors from the hydraulic brake booster.
CHECK:
(a) Check continuity between terminal BM1 of the ABS motor
2 relay and terminal MT of the ABS & BA & TRAC & VSC
ECU.
(b) Check continuity between terminal BM2 of the ABS motor
1 relay and terminal MT of the ABS & BA & TRAC & VSC
ECU.
OK:
Continuity
HINT:
There is resistance of 33 ± 3 W between terminal BM1or BM2
and MT of the hydraulic brake booster.
NG Repair or replace harness, connector or hy-
draulic brake booster.
OK

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-591
784 Author
: Date
:
2004 LAND CRUISER (RM1071U)
6 Check for open and short circuit in harness and connector between ABS motor1
and ABS motor2 relay and ABS & BA & TRAC & VSC ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.

F17713
ABS & BA & TRAC
& VSC ECU ABS & BA & TRAC
& VSC Actuator
Engine Room R/B
Cowl Side J/B LHFL Block
Battery ABS MTR2 Relay
ABS MTR1 RelayPH A4111
PL A449
MR2 A442 O
W
Y-B A373
A384 PH
PL
3
A38
BM2
2
A37
BM1
A375
PHG
1
A37 GND1
1
A40 GND
2
A38 PLG
6
A38 GND2
EE
IF L-R
R
W-B
W-B
W-B
W-B
W-B
W-BW-B
W-B
W-B W-B W-B
2A3 2B 13
F152A41 MR129 A41R1+ 1 A44 R2+3
1
1
1C
1 1
2ABS No.2
3 4 2
1 1
2 43 1
1
1
1B-G
MAIN RW-L
P DI-592
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
785 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1254 / 54 Pressure Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1254 / 54
Either of the following 1. or 2. is detected:
1. After turning the ignition switch ON, short or open circuit
in pressure switch (PL) continued for more than 1 sec.
2. After turning the ignition switch ON, open in pressure
switch (PH) continued for more than 1 sec.

Pressure switch (PH or PL)

Pressure switch circuit
WIRING DIAGRAM
DIC9W-01

F17713
ABS & BA & TRAC
& VSC ECU ABS & BA & TRAC
& VSC Actuator
Engine Room R/B
Cowl Side J/B LHFL Block
Battery ABS MTR2 Relay
ABS MTR1 RelayPH A4111
PL A449
MR2 A442 O
W
Y-B A373
A384 PH
PL
3
A38
BM2
2
A37
BM1
A375
PHG
1
A37 GND1
1
A40 GND
2
A38 PLG
6
A38 GND2
EEIF L-R
R
W-B
W-B
W-B
W-B
W-B
W-BW-B
W-B
W-B W-B W-B
2A3 2B 13
F152A41 MR129 A41R1+ 1 A44 R2+3
1
1
1C
1 1
2ABS No.2
3 4 2
1 1
2 43 1
1
1
1B-G
MAIN RW-L
P DI-596
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
789 Author
: Date
:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM

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-602- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
795 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1257 / 57 Power Supply Drive Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1257 / 57When a malfunction inside ECU is detected.

Battery

Power source circuit

Skid control ECU
WIRING DIAGRAM
DIC9Y-01

F17749
ABS & BA & TRAC
& VSC ECU
EXI2 A432
B-L
3B 20
3Q54Cowl Side J/B RH
SB
IX15
B-L
32
B-L
EB13
B-LD5
Detection SW
1
2R-L
EB111
R-L
IN214
R-L
Ib26
R-L
3E3 GAUGE2
3 5
21 IG1 No.3 Relay
3C1
3Q 39
2E 39AM1
2C
II F161B-G
J/B No.2
ALT
J/B No.3 B-G
SB
B-R 2Q77
2E 37Cowl Side J/B LH
L-B
I18
Ignition SW
42IG1 AM16D J/B No.6
6D31
1 Cowl Side J/B RH
FL Block
F171
Battery Cowl Side J/B LH
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-605
798 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1268 / 68 Transfer L4 Position Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1268 / 68Open or short circuit in transfer L4 position switch.
Transfer L4 position switch

Transfer L4 position switch circuit
WIRING DIAGRAM
DIC9Z-01