Page 1217 of 4323
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1015
1209 Author: Date:
2005 SEQUOIA (RM1146U)
DTC Non ± Code Translate ECU malfunction
CIRCUIT DESCRIPTION
Translate ECU DTCs can be read by blinks of the brake warning light (see page DI±911).
DTC No.DTC Detecting ConditionTrouble Area
Non ± code*Translate ECU internal malfunction is detected.
Brake warning light circuit
Tc terminal circuit
Translate ECU
*: Neither the normal system code nor a trouble code is output.
INSPECTION PROCEDURE
1 Check the BRAKE warning light circuit (See page DI±1033).
OK:
BRAKE warning light circuit is normal.
NG Repair or replace the BRAKE warning light cir-
cuit.
OK
2 Check the Tc terminal circuit (See page DI±1055).
OK:
Tc terminal circuit is normal.
NG Repair or replace the Tc terminal circuit.
OK
Check and replace the translate ECU.
DI942±03
Page 1218 of 4323
DI±1016
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1210 Author: Date:
2005 SEQUOIA (RM1146U)
DTC Always ON* Malfunction in Skid Control ECU
*: ABS warning light
When reading DTCs by SST (CHECK WIRE), if the ABS warning light remains ON, troubleshoot by following
the inspection flow.
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Always ON
When any of the following conditions are detected:
1. Malfunction in ECU internal circuit is identified.
2. ECU power source voltage is too high.
Battery
Charging system
Power source circuit
ABS warning light circuit
Skid control ECU
HINT:
There is a possibility that the hand±held tester cannot be used when the ECU is abnormal.
DI943±03
Page 1219 of 4323
F19777
ABS & VSC Actuator
(Skid Control ECU)
WA 35
S1 R±W IL2 4 R±W
21 C6
Combination Meter
Instrument Panel J/B
11
1HB±O
24
2 1CIGN1
B±R
I18
Ignition SW
IG2
AM2
IG1
AM13
1C
6
1C
4
1C7
1J
1
1L
4
1F AM1
ECU±IG1 2
2 6
5
1W±R
W±L
B±YW±R
WBB 1
2C1
2D
B±RSub J/B No.3
8
3A8
3CB±R
B±R
B±R B±R
W±B A
J37
A
J38 A
J371
IL113
S1
IG1 IG1
GND1
40O
O A
AA
AW±B
W±B
W±B J18
J/C J43
J/C17
IL1
9
IL11
S1
GND1
GND2 32
S1
IG IG W
B
B 5 8
4
ALTF10
Fusible
Link
Block
BatteryEngine Room J/B
AM2
J/C T5
Translate ECUABS
B±R
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1017
1211 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Page 1220 of 4323
F16990
ON
IG1
GND
DI±1018
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1212 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI±911.
YES Repair circuit indicated by the output code
(See page DI±921).
NO
2 Check that the skid control ECU connector is securely connected to the skid
control ECU (See page IN±35).
NG Connect the connector to the skid control ECU.
OK
3 Check voltage between terminals IG1 and GND of the skid control ECU connec-
tor.
PREPARATION:
Disconnect the skid control ECU connector.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage between terminals IG1 and GND of
the skid control ECU harness side connector.
OK:
Voltage: 10 to 14 V
NG Check for open and short circuit in harness and
connector between ECU±IG fuse and skid con-
trol ECU (See page IN±35).
OK
Page 1221 of 4323
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1019
1213 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check battery positive voltage.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system
(See page CH±1).
OK
5 Check the Tc terminal circuit (See page DI±1055).
OK:
Tc terminal circuit is normal
NG Repair or replace the Tc terminal circuit.
OK
Page 1222 of 4323

DI±1020
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1214 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check operation of the ABS warning light.
When using the hand±held tester:
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position and push the hand±held tester main switch ON.
(c) Select 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.
ItemVehicle Condition / Test DetailsDiagnostic Note
ABS WARN LIGHTTurns ABS warning light ON / OFFObserve combination me-
ter
OK:
ABS warning light operates.
When 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 to the ON position.
CHECK:
Check the ABS warning light comes on.
OK:
ABS warning light comes on.
OK Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero
point calibration (See page DI±897).
NG
7 Check ABS warning light.
See combination meter troubleshooting on page DI±1614.
NG Repair combination meter assembly
(See page DI±1610).
OK
Check for short circuit in harness and connector between ABS warning light and skid control
ECU (See page IN±35).
Page 1223 of 4323
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1021
1215 Author: Date:
2005 SEQUOIA (RM1146U)
ABS Warning Light Circuit (Remains ON)
CIRCUIT DESCRIPTION
If the ECU detects trouble, it turns on the ABS warning light and prohibits ABS control. At this time, the ECU
records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the ABS warning light blink and indicate the DTC.
DI944±04
Page 1224 of 4323
F19777
ABS & VSC Actuator
(Skid Control ECU)
WA 35
S1 R±W IL2 4 R±W
21 C6
Combination Meter
Instrument Panel J/B
11
1HB±O
24
2 1CIGN1
B±R
I18
Ignition SW
IG2
AM2
IG1
AM13
1C
6
1C
4
1C7
1J
1
1L
4
1F AM1
ECU±IG1 2
2 6
5
1W±R
W±L
B±YW±R
WBB 1
2C1
2D
B±RSub J/B No.3
8
3A8
3CB±R
B±R
B±R B±R
W±B A
J37
A
J38 A
J371
IL113
S1
IG1 IG1
GND1
40O
O A
AA
AW±B
W±B
W±B J18
J/C J43
J/C17
IL1
9
IL11
S1
GND1
GND2 32
S1
IG IG W
B
B 5 8
4
ALTF10
Fusible
Link
Block
BatteryEngine Room J/B
AM2
J/C T5
Translate ECUABS
B±R DI±1022
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1216 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM