2001 TOYOTA SEQUOIA terminals of DLC3

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1491
1685 Author: Date:
2005 SEQUOIA (RM1146U)
SRS Warning Light Circuit Malfunction (Always light up, when
DTC is not output)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition
switch is turned from the LOCK position to ON position, and then goes off automatically.
If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.
When terminals TC and CG of the DLC3 are connected, the DTCs are displayed by blinking the SRS warning
light.
DIDHU±01

DI±1496
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1690 Author: Date:
2005 SEQUOIA (RM1146U)
SRS Warning Light Circuit Malfunction (Does not light up, when
ignition switch is turned to on)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter assembly.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition
switch is turned from the LOCK position to the ON position, and then goes off automatically.
If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.
When terminals TC and CG of the DLC3 are connected, the DTC is displayed by blinking the SRS warning
light.
WIRING DIAGRAM
See page DI±1491.
INSPECTION PROCEDURE
CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (±) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connectors from the airbag sensor assembly.
(d) Disconnect the connectors from the steering wheel pad.
(e) Disconnect the connectors from the front passenger airbag assembly.
(f) w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.
(g) w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.
(h) Disconnect the connectors from the front seat outer belt LH and RH.
1 Check battery.
CHECK:
Measure the voltage of the battery.
OK:
Voltage: 11 to 14 V
NG Replace battery.
OK
DIDHV±01

H24006
Airbag Sensor
Assembly
TC 15
P±B
A20 G Instrument Panel J/B Sub J/B No. 4
D6
DLC3 5
4D 5
4E
5
4B
5
4C5
4A P±B
P±B
P±B P±B 23
E4 ECM
TC
T5
Translate ECU
T17
Tire Pressure Monitor ECUTC
TC28
12 13TC
CG
4O
A
J43
J/C
IGA
O 9
1A 15
1F DI±1498
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1692 Author: Date:
2005 SEQUOIA (RM1146U)
TC Terminal Circuit
CIRCUIT DESCRIPTION
DTC output mode is set by connecting terminals TC and CG of the DLC3.
The DTCs are displayed by blinking of the SRS warning light.
WIRING DIAGRAM
HINT:
When each warning light stays blinking, a ground short in the wiring of the terminal TC of the DLC3 or an
internal ground short in each ECU is suspected.
DIDHW±01

DI3CH±22
I28458
E8E7 E6 E5 E4
DI±1542
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1736 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
TC (E4±23) ± E1 (E6±1)P±B ± BRDTC output signalIgnition switch on10 to 14 V
TC (E4±23) ± E1 (E6±1)P±B ± BRDTC output signalIgnition switch on, connect terminals
TC and CG of DLC3Below 1 V
ST1± (E4±16) ± E1 (E6±1)L±B ± BRCruise cancel input signalIgnition switch on, depress brake
pedalBelow 1 V
ST1± (E4±16) ± E1 (E6±1)L±B ± BRCruise cancel input signalIgnition switch on, release brake
pedal10 to 14 V
STP (E4±15) ± E1 (E6±1)G±Y ± BRStop light switch input sig-
nalIgnition switch on, depress brake
pedal10 to 14 V
STP (E4±15) ± E1 (E6±1)G±Y ± BRStop light switch input sig-
nalIgnition switch on, release brake
pedalBelow 1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on10 to 14 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, CANCEL switch
held ON6.6 to 10.1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, +/RES switch
held ON4.5 to 7.1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, ±/SET switch
held ON2.3 to 4.0 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, MAIN switch held
ONBelow 1 V
SPD (E5±8) ±E1 (E6±1)G±O ± BRSpeed signalIgnition switch on, rotate driving
wheel slowlyPulse generation
(see page DI±278)
D (E5±21) ±E1 (E6±1)W±R ± BRD shift position switch in-
put signalIgnition switch on, shift lever D posi-
tion10 to 14 V
D (E5±21) ±E1 (E6±1)W±R ± BRD shift position switch in-
put signalIgnition switch on, shift lever any
position except DBelow 1 V
PI (E5±18) ±E1 (E6±1)LG±R ± BRCruise indication signalIgnition switch on, MAIN switch
OFF10 to 14 V
PI (E5±18) ±E1 (E6±1)LG±R ± BRCruise indication signalIgnition switch on, MAIN switch onBelow 1 V

A08841
Hand±held Tester
DLC3
DIDEZ±01
A04550
DLC3 1 2345678
9
10 11 12 1314 15 16
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1543
1737 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. DESCRIPTION
The ECM controls the cruise control system of the vehicle. The
data and DTCs relating to the cruise control system can be read
from the DLC3 of the vehicle. If no DTCs are output when
checking for DTCs, there may be a problem with the combina-
tion meter or the multiplex communication system.
Use the hand±held tester or SST to check and solve the prob-
lem.
SST 09843±18040
2. CHECK THE DLC3
The vehicle's ECM uses ISO 9141±2 for communication. The
terminal arrangement of the DLC3 complies with SAE J1962
and matches the ISO 9141±2 format.
Symbols (Terminals No.)Terminal DescriptionConditionSpecified Condition
SIL(7) ± SG(5)Bus º+º lineDuring transmissionPulse generation
CG(4) ± Body groundChassis groundAlwaysBelow 1 W
SG(5) ± Body groundSignal groundAlwaysBelow 1 W
BAT(16) ± Body groundBattery positiveAlways11 to 14 V
HINT:
If the display shows ºUNABLE TO CONNECT TO VEHICLEº af-
ter connecting the hand±held tester to the DLC3, turning the
ignition switch to the ON position and operating the tester, there
is a problem on either the vehicle side or the tool side.

If communication is normal when the tool is connected to
another vehicle, inspect the DLC3 on the original vehicle.

If communication is still impossible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.

DIDF0±01
A04550
TC CG
1 2345678
9
10 11 12 1314 15 16
I11929
CRUISE Main
Indicator Light
I28693
Normal System Code:
ON
OFF
Code 52
Code 21 0.25 sec.
0.25 sec.
ON
OFFDiagnostic Trouble Code:
4.5 sec. 2.5 sec. 1.5 sec. 0.5 sec.
0.5 sec.
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1545
1739 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. DTC CHECK (USING SST CHECK WIRE)
(a) Using SST check wire, connect terminals TC and CG
of
the DLC3.
SST 09843±18040
(b) Turn the ignition switch to the ON position.
(c) Read and record DTCs from the CRUISE main indicator
light on the combination meter. As examples, refer to the
chart below for the blinking patterns of the normal system
code, and diagnostic trouble codes 21 and 52.
(d) Refer to the Diagnostic Trouble Code Chart (see page
DI±1549) for DTC information.
2. DTC CLEAR (USING SST CHECK WIRE)
Remove the EFI No.1 and ETCS fuses from the engine room
J/B for more than 60 seconds, or disconnect the battery termi-
nal for more than 60 seconds.

I28464
ECM
Sub J/B No.4
23
E4
1328
T5
15
A205
4E
TC
TC5
4B
5
4C 5
4D
5
4A 15
1F 9
1A
J43
J/C12
T17 P±B P±B Translate ECU
TCP±B
P±B
O
O 4 TC
CG D6
DLC3 Airbag Sensor
Assembly
Instrument Panel J/BTire Pressure
ECU
P±B
G
A A
IGTC
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1567
1761 Author: Date:
2005 SEQUOIA (RM1146U)
Diagnosis circuit
CIRCUIT DESCRIPTION
Making a short circuit between terminals TC and CG of the DLC3 will output DTCs from the DLC3.
WIRING DIAGRAM
HINT:
When a particular warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an
internal ground short in the relevant ECU is suspected.
DIDF5±01

DIABB±02
I24389
T16 Transponder Key ECU: DI±1574
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1768 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSpecified condition
+B e GND
(T16 ± 1 e T16 ± 14)W±R e OAlways10 to 14 V
IG e GND
(T16 ± 2 e T16 ± 14)B±O e OIgnition switch ON10 to 14 V
D e GNDWLOIgnition switch ON " 10 to 14 V " D e GND
(T16 ± 3 e T16 ± 14)W±L e OIgnition switch ON "
Connect terminals OP3 and CG of DLC310 to 14 V "
Below 2 V
CODE e GND
(T16 ± 4 e T16 ± 14)R±Y e OIgnition switch ON10 to 14 V
RXCK e GND
(T16 ± 5 e T16 ± 14)LG e OIgnition switch ON10 to 14 V
VC12 e AGND
(T16 ± 6 e T16 ± 12)GR±B e GR±LAlways10 to 14 V
IND e GNDLG BO
Security indicator light is on. (It flashes when the immobiliser
ti ti)3 to 6 V " IND e GND
(T16 ± 7 e T16 ± 14)LG±B e Osystem is operating.) "
Security indicator light is off.3 to 6 V "
Below 1 V
CTY e GNDGR LODriver's door closed " 10 to 14 V " CTY e GND
(T16 ± 8 e T16 ± 14)GR±L e ODriver s door closed "
Driver's door open10 to 14 V "
Below 1 V
KSW e GNDYGOKey unlock warning switch ON (Key inserted) " Below 1 V " KSW e GND
(T16 ± 9 e T16 ± 14)Y±G e OKey unlock warning switch ON (Key inserted) "
Key unlock warning switch OFF (Key not inserted)Below 1 V "
10 to 14 V
EFII e GND
(T16 ±10 e T16 ± 14)L±Y e OIgnition switch ON10 to 14 V
EFIO e GND
(T16 ±11 e T16 ± 14)P±G e OIgnition switch ON10 to 14 V
AGND e Body ground
(T16 ±12 e Body
ground)
GR±L e Body groundAlwaysBelow 1 V
TXCT e GND
(T16 ± 13 e T16 ± 14)Y±G e OIgnition switch ON10 to 14 V
GND e Body ground
(T16 ±14 e Body
ground)
O e Body groundAlwaysBelow 1 V