Page 825 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-573
766 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1249 / 49 Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1249 / 49
ECU terminal IG1 voltage is 9.5 to 17.2 V, ABS is in non-
operation, and an open in stop light switch circuit continues
for 0.3 sec. or more.Stop light bulb
Stop light switch circuit
DIC9S-02
Page 826 of 3115
F17777F18531
ABS & BA & TRAC
& VSC ECU
S5
Stop Light SW
F16
Fl Block
H11
High Mounted
Stop Light STOP
R12
Rear Combination
Light RHSTP A4210
G-W
2B 23
2K 35
2D 35
2D31
2C
B-G1
ALT
J/B No.21 G-W
21
G-R
BP38
G-W
BH22
G-W
21W-B
BH2 5
W-B
BP3
6 3 5 G-W
G-W
BQ23
G-W G-W
31W-B
W-B
BQ2 10
G-W
31
W-B
BJ BM
BJ BK 3 5 BL48
G-W
BD27 G-W
W-B
W-B
W-B
W-BW-B
W-B G-W
BatteryR13
Rear Combination
Light RHR10
Rear Combination
Light LH
R11
Rear Combination Light LH
G-WCowl Side J/B LH
G-WG-W
W-B
3BH2
(*2)
(*1)
*1: w/ Navigation System
*2: w/o Navigation System DI-574
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
767 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
Page 827 of 3115
F08298
STP
(-) (+)
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-575
768 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check operation of the stop light switch.
CHECK:
Check that the stop light lights up when the brake pedal is depressed and goes OFF when the brake pedal
is released.
OK Go to step 3.
NG
2 Check stop light circuit (See page BE-50).
NG Check stop light bulb and repair or replace stop
light circuit.
OK
3 Check voltage between terminal STP of skid control ECU and body ground.
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
Measure voltage between terminal STP of the skid control ECU
and body ground when the brake pedal is depressed.
OK:
Voltage: 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page IN-36).
NG
Page 828 of 3115
DI-576- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
769 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check for open circuit in harness and connector between skid control ECU and
stop light switch (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
Page 829 of 3115

F17712
ABS & BA & TRAC
& VSC Actuator
Engine Room R/B
FL Block
Cowl Side J/B LH
Battery ABS MTR2 Relay
ABS MTR1 RelayMTT A4127
MT+ A4128
MT- A4118
MR2
A442
R2+
A443
W-L
1
1C 1
1 1
2ABS No.2
3 41
2 1
1
1
1B-R
L
GR
Y-B A387
A385
A388
A383
L-R
R
A372
A371
A386
A401
W-BW-BW-B
W-B W-B
EE2A3
IF
GND GND2GND1BM1 BM2 MT- MT+MTT
B-GF152
MAIN
P
R
A41MR1 29 A41
R1+ 1
W-B 43
21ABS & BA & TRAC
& VSC ECU
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-577
770 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1251 / 51 Hydraulic Brake Booster Pump Motor
Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1251 / 51
Either of the following 1. or 2. is detected:
1. After turning the ignition switch ON, the current of more
than 30 A flows to the motor for more than 1 sec.
2. After turning the ignition switch ON, less than 7 A
change in current is detected more than 3 times in a row
when the motor is ON.
Hydraulic brake booster pump motor
WIRING DIAGRAM
DIC9T-02
Page 830 of 3115
F02859
(-)
(+)
(-)
(+)
BM2
BM1EM1 EM2
F04505
BM1
EM1MT
MT+
MT-
BM2
EM2
DI-578- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
771 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check operation of hydraulic brake booster pump motor.
PREPARATION:
Disconnect the 2 connectors from the hydraulic brake booster.
CHECK:
Connect the battery positive lead to terminal BM1 or BM2
and the battery negative lead to terminal EM1 or EM2 of the
hydraulic brake booster (pump motor) connector.
OK:
The operation sound of the pump motor should be
heard.
NG Go to step 4.
OK
2 Check hydraulic brake booster resistance.
PREPARATION:
Disconnect the 2 connectors from the hydraulic brake booster.
CHECK:
Check resistance between terminals MT+ and MT-, BM1 and
MT, BM2 and MT, EM1 and MT+, EM2 and MT+ of the hydraulic
brake booster connector.
OK:
30 to 36 W
NG Replace the hydraulic brake booster assembly.
OK
Page 831 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-579
772 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check for open circuit in harness and connector between hydraulic brake boost-
er (MT+, MT-) and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
4 Check for open or short circuit in harness and connector between hydraulic
brake booster and skid control ECU (See page IN-36).
NG Replace wire harness.
OK
5 Check hydraulic brake booster pump motor (See page BR-64).
NG Replace hydraulic brake booster pump motor.
OK
Replace
hydraulic brake booster.
Page 832 of 3115
F17712
ABS & BA & TRAC
& VSC ECU ABS & BA & TRAC
& VSC Actuator
Engine Room R/B
FL Block
Cowl Side J/B LH
Battery ABS MTR2 Relay
ABS MTR1 RelayMTT A4127
MT+ A4128
MT- A4118
MR2
A442
R2+
A443
W-L
1
1C 1
1 1
2ABS No.2
3 41
2 1
1
1
1B-R
L
GR
Y-B A387
A385
A388
A383
L-R
R
A372
A371
A386
A401
W-BW-BW-B
W-B W-B
EE2A3
IF
GND GND2GND1BM1 BM2 MT- MT+MTT
B-GF152
MAIN
P
R
A41MR1 29 A41
R1+ 1
W-B 43
21 DI-580
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
773 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1252 / 52 Hydraulic Brake Booster Pump Motor
ON Time Abnormally Long
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1252 / 52After the ignition switch is turned ON, the power is supplied
to the pump motor for more than 5 minutes.Hydraulic brake booster pump motor
Hydraulic brake booster pump motor circuit
Pressure switch (PH or PL)
WIRING DIAGRAM
DIC9U-02