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
Page 777 of 3115
DI-636- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
829 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check parking brake switch circuit (See page BE-63).
NG Repair or replace parking brake switch circuit.
OK
2 Check brake fluid level warning switch circuit (See page BE-63).
NG Repair or replace brake fluid level warning
switch circuit.
OK
3 Is DTC output for ABS?
YES Repair circuit indicated by the output code.
NO
4 Do the warning lights other than BRAKE warning light come on?
YES Go to step 6.
NO
Page 779 of 3115
DI-638- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
831 Author: Date:
2004 LAND CRUISER (RM1071U)
7 Check BRAKE warning light.
Check if that the open circuit in the combination meter circuit (See page BE-58).
NG Repair brake warning light bulb or combination
meter assembly.
OK
8Check for short circuit in harness and connector between brake 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 791 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-539
732 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check whether zero point calibration of yaw rate sensor has been done or not.
PREPARATION:
Shift the shift lever in the P position and turn the ignition switch ON. Repeat connecting and releasing Ts
and E
1 terminals of the DLC1 4 times or more for 8 sec. After that do not move the vehicle for 15 sec. or more.
CHECK:
Check that theºVSC TRACº warning light and ºVSC OFFº indicator light light up for 15 sec.
OK No problem.
NG
2 Check for open and short circuit in harness and connector between PNP switch
(P position) and skid control ECU and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
3 Check for open and short circuit in harness and connector between yaw rate
sensor and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
4 Check yaw rate sensor (See page DI-553).
NG Replace yaw rate sensor.
OK
Check and replace skid control ECU.
Page 819 of 3115
F17752
ABS & BA & TRAC
& VSC Sensor
ShieldedGL1
GL2
YD
VYS
YAW
GYAW
YSS A43
1827 289 191022
G
Y
L
B
W
R 4
2
6
8
1
5A43
A43
A43
A43
A43
A42 IG4
IG4
IG4
IG4
IG4
IG4
IG416
17
21
19
20
18
22
ShieldedG
Y
L
B
W
R GL1
GL2
YD
VYS
YAW 2
GYAWABS & BA & TRAC
& VSC ECU
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-567
760 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1244 / 44 Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects vehicle deceleration. The sensor signal is used in ABS & BA & TRAC & VSC control.
If the sensor functions abnormally, the ABS warning light comes on.
DTC No.DTC Detecting ConditionTrouble Area
C1244 / 44
Either of the following 1., 2., 3. or 4. is detected:
1. The condition that ECU terminals GL1 and GL2 values are
-1.5 G or less or 1.5 G or more continues for 1.2 sec. or
more.
2. The condition that the deceleration sensor terminal VGS
voltage is 4.4 V or less or 5.6 V or more continues for 1.2
sec. or more.
3. At a vehicle speed of 0 mph (0 km/h), after the difference of
output value between deceleration sensor terminals GL1
and GL2 becomes 0.6 G or more, and the condition that
does not become 0.4 G or less continues for 60 sec. or
more.
4. Deceleration sensor signal momentary open occurs for 7
times or more.
Deceleration sensor
Deceleration sensor circuit
WIRING DIAGRAM
DIC9Q-01
Page 862 of 3115
DI-610- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
803 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Carry out yaw rate (deceleration) sensor zero point calibration and confirm it by
VSC TRAC warning light.
OK:
VSC TRAC warning light blinks
OK No problem.
NG
3 Check DTC for the VSC (See page DI-505).
*1 :Other than DTC C1336 / 39 is output.
*
2 :DTC C1336 / 39 only is output.
*
1Repair ABS control system according to the
code output.
*
2
4 Check for open and short circuit in harness and connector between PNP switch
(P position) and skid control ECU and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
5 Check for open and short circuit in harness and connector between yaw rate
(deceleration) sensor and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Page 875 of 3115
F00044
1
2
3 4
(+) (-) Continuity1 2
3 4
1
2
3 4 Open
Continuity
DI-640- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
833 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Do the warning lights other than SLIP 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).
