TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1489
1683 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check connectors.
PREPARATION:
(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.
CHECK:
Check the connectors are properly connected to the occupant classification ECU and the 4 occupant classifi-
cation sensors.
OK:
The connectors are connected.
PREPARATION:
Disconnect the connectors from the occupant classification ECU and the 4 occupant classification sensors.
CHECK:
Check the connectors are not damaged or deformed.
OK:
The connectors are normal.
NG Repair or replace connector, then go to step 1.
OK
9 Check DTC.
PREPARATION:
(a) Connect the connectors to the occupant classification ECU and the 4 occupant classification sensors.
(b) Connect the negative (±) terminal cable to the battery.
CHECK:
(a) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(b) Clear the DTCs stored in memory (see page DI±1147).
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(e) Check the DTCs (see page DI±1147).
OK:
DTC is not output.
NG Replace airbag sensor assembly
(see page RS±82).
OK

DI±1490
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1684 Author: Date:
2005 SEQUOIA (RM1146U)
10 Replace occupant classification ECU.
(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) Replace the occupant classification ECU (see page RS±111).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
NEXT
11 Perform zero point calibration.
(a) Connect the negative (±) terminal cable to the battery.
(b) Connect the hand±held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the hand±held tester, perform ºZero point calibrationº (see page DI±1128).
OK:
The ºCOMPLETEDº is displayed on the tester screen.
NEXT
12 Perform sensitivity check.
Using the hand±held tester, perform ºSensitivity checkº (see page DI±1128).
OK:
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NEXT
END

± 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

H23996
LA
A2014
ABR I18
Ignition SW
Combination Meter
BatteryIG2 A2021
E1 A2025
E2 A2026 B
W±B
W±B B±R
IG2 AM26 5 W±R
SRS B±Y
C5 29
C612 C6241D4
1A5 1A3
IGN1
1D6
1F9
101A6
1A8 Instrument Panel J/B
Engine Room J/B1H11
1J7
2C1
2D1AM2BR
W±B
W±B
J8
J/C A
A 4
5 B
BB±O
IEAirbag Sensor
Assembly
1C2
Instrument Panel J/B
F10
Fusible Link Block 1C3 D6
DLC3
114B10
4A20
4A10B±Y
B±Y
1F W±R Sub J/B No. 4 DI±1492
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1686 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1493
1687 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check battery.
CHECK:
Measure the voltage of the battery.
OK:
Voltage: 11 to 14 V
NG Replace battery.
OK
2 Check connection of connectors.
PREPARATION:
Disconnect the negative (±) terminal cable from the battery, and wait for at least 90 seconds.
CHECK:
Check that the connectors are properly connected to the airbag sensor assembly and combination meter.
OK:
The connectors are connected securely.
NG Connect connectors.
OK
3 Prepare for inspection.
CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a) Disconnect the connectors from the airbag sensor assembly.
(b) Disconnect the connectors from the steering wheel pad.
(c) Disconnect the connectors from the front passenger airbag assembly.
(d) w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.
(e) w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.
(f) Disconnect the connectors from the front seat outer belt LH and RH.
NEXT

H23607I27704H24031
A20
LA
C5
C5±29 Airbag Sensor Assembly:
Combination Meter:
DI±1494
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1688 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check wire harness (airbag sensor assembly ± combination meter).
PREPARATION:
(a) Disconnect the connector from the combination meter.
(b) Connect the negative (±) terminal cable to the battery,
and wait for at least 2 seconds.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage and resistance according to the val-
ue(s) in the table below.
OK:
Tester ConnectionConditionSpecified Condition
A20±14 (LA) ± C5±29AlwaysBelow 1 W
A20±14 (LA) ±
Body groundAlways1 MW or higher
A20±14 (LA) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace wire harness.
OK

H23040
LA
A20
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1495
1689 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check combination meter.
PREPARATION:
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (±) terminal cable from the bat-
tery, and wait for at least 90 seconds.
(c) Connect the connector to the combination meter.
(d) Connect the negative (±) terminal cable to the battery,
and wait for at least 2 seconds.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±14 (LA) ±
Body groundIgnition switch ON8 to 14 V
NG Replace combination meter
(see page BO±89).
OK
Replace airbag sensor assembly (see page RS±82).

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

H23040
LA A20
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1497
1691 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check combination meter.
PREPARATION:
Connect the negative (±) terminal cable to the battery, and wait for at least 2 seconds.
CHECK:
Turn the ignition switch to the ON position, check the operation of the SRS warning light.
OK:
The SRS warning light comes on (goes off 6 seconds after the ignition switch is turned to the
ON position).
NG Go to step 3.
OK
Replace airbag sensor assembly (see page RS±82).
3 Check wire harness (combination meter ± airbag sensor assembly).
PREPARATION:
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (±) terminal cable from the bat-
tery, and wait for at least 90 seconds.
(c) Disconnect the connector from the combination meter.
(d) Connect the negative (±) terminal cable to the battery,
and wait for at least 2 seconds.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±14 (LA) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace wire harness.
OK
Replace combination meter (see page BO±89).

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