2001 TOYOTA SEQUOIA ECU

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1351
1545 Author: Date:
2005 SEQUOIA (RM1146U)
2 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
3 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.
NEXT
4 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±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±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

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

H23483CG
DLC3:
D6
H23040TC
A20
DI±1500
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1694 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check wire harness (CG of DLC3 ± body ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
D6±4 (CG) ± Body groundAlwaysBelow 1 W
NG Repair or replace wire harness (CG of DLC3 to
body ground).
OK
3 Check wire harness (TC of airbag sensor assembly ± body ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±15 (TC) ±
Body groundAlways1 MW or higher
NG Repair or replace wire harness or each ECU.
OK
Replace airbag sensor assembly (see page RS±82).

DIDDX±01
I28733
Instrument Panel J/B

ECU±IG Fuse

PWR SEAT Fuse
Power Seat Motor (Reclining) Lumbar Support Control Motor
Seat Memory Switch
Power Seat Motor (Rear Lifter)
Lumbar Support Control Switch
Position Control ECU & Switch Assy
Power Seat Motor (Front Vertical)Power Seat Motor (Slide)
DI±1502± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1696 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DIDDZ±01
I28552
Position Control ECU
& Switch Assy
Park/Neutral
Position Switch
Combination
MeterPower Seat Motor
Driver Side (Reclining)
Power Seat Motor
Driver Side (Slide) Power Seat Motor
Driver Side (Front Vertical) Power Seat Motor
Driver Side (Lifter)
Front Door Courtesy
Light Switch Assy Seat Memory Switch Lumbar
Support
Control
MotorLumbar Support
Control Switch To Battery
To Battery To Ignition SwitchECU±B
PWR SEATECU±IGSYSB
IG
+BRCL+
RCL±
LFT+
LFT±
FRV+
FRV±
SLD+
SLD±
SW1
SW2
MMRYDCTY
Key Unlock
Warning Switch
KSW
Body ECU
BEANTo Ignition Switch
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1503
1697 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM