2001 TOYOTA SEQUOIA O2 sensor

DI±1244
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1438 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check connection of 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 that the connectors are properly connected to the airbag sensor assembly and the combination meter.
OK:
The connectors are connected securely.
NG Connect connector, then go to step 1.
OK
8 Prepare for inspection.
PREPARATION:
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

H01015G27651H23985
RMILAirbag
Sensor
Assembly A Cowl Wire Combination
Meter
A20B C D
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1245
1439 Author: Date:
2005 SEQUOIA (RM1146U)
9 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, and check the RSCA OFF indicator condition.
OK:
The RSCA OFF indicator comes on when the RSCA OFF switch is ON.
NG Go to combination meter system
(see page DI±1610).
OK
10 Check cowl wire (short to ground).
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.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±20 (RMIL) ±
Body groundAlways1 MW or higher
NG Repair or replace cowl wire.
OK

H22564H23040I27704H23986
Combination
Meter
C5±40RMILA20
C6
A
B C DAirbag
Sensor
Assembly
Cowl Wire
DI±1246
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1440 Author: Date:
2005 SEQUOIA (RM1146U)
11 Check cowl wire (airbag sensor assembly ± combination meter).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±20 (RMIL) ± C5±40AlwaysBelow 1 W
NG Repair or replace cowl wire.
OK
Replace airbag sensor assembly (see page RS±82).

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1247
1441 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1662/45 SRS Warning Light Circuit Malfunction
CIRCUIT DESCRIPTION
The SRS warning light circuit consists of the airbag sensor assembly and the combination meter.
When the airbag sensor assembly detects a malfunction in the SRS airbag system, the SRS warning light
comes on to inform the driver.
It also comes on when the power voltage drops, and automatically goes off in approximately 10 seconds
after the power voltage returns to normal (DTC is not stored).
The SRS warning light comes on for 6 seconds after the ignition switch is turned to the ON position and goes
off if the system is normal.
When an open circuit is detected, such as when the connector between the combination meter and the air-
bag sensor assembly is disconnected, the SRS warning light remains on even when approximately 6 se-
conds elapsed after the ignition switch is turned to the ON position.
DTC B1662/45 is recorded when a malfunction is detected in the SRS warning light circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1662/45

The airbag sensor assembly receives an open circuit sig-
nal or a short circuit to ground signal in the SRS warning
light circuit for 2 seconds.

SRS warning light malfunction

Airbag sensor assembly malfunction

Combination meter (SRS warning light)

Airbag sensor assembly

Cowl wire
HINT:
When DTC B1662/45 and B1000/31 are output simultaneously, perform the troubleshooting for DTC
B1662/45 first.
DIDH3±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±1248
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1442 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1249
1443 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:
(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 that the connectors are properly connected to the airbag sensor assembly and combination meter.
OK:
The connectors are connected securely.
NG Connect connectors, then go to step 1.
OK
3 Check combination meter.
PREPARATION:
(a) Disconnect the connectors from the airbag sensor assembly.
(b) 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 combination meter system
(see page DI±1610).
OK

H22564H23040I27704H23986
A Cowl Wire Combination
Meter
C5
A20
Airbag
Sensor
Assembly
B C D
C5±29LA
DI±1250
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1444 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check cowl wire (airbag sensor assembly ± combination meter).
PREPARATION:
Disconnect the connector from the combination meter.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±14 (LA) ± C5±29AlwaysBelow 1 W
A20±14 (LA) ±
Body groundAlways1 MW or higher
NG Repair or replace cowl wire.
OK
Replace airbag sensor assembly (see page RS±82).

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1253
1447 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:

If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installa-
tion bolts to see the under surface of seat cushion.

In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time
may cause a problem, such as seat rail deformation. Hold the seat only as necessary.
1 Check DTC.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page DI±1147).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Using the hand±held tester, check the DTCs of the occupant classification ECU (see page DI±1147).
OK:
DTC B1771 is not output.
HINT:
Codes other than DTC B1771 may be output at this time, but they are not related to this check.
NG Go to step 2.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check (see page DI±1137).