sensor TOYOTA SEQUOIA 2001 Service Repair Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 2001, Model line: SEQUOIA, Model: TOYOTA SEQUOIA 2001Pages: 4323, PDF Size: 48.49 MB
Page 1537 of 4323
H23821
SVC1SVC2 SVC4 SVC3
O7 Occupant Classification ECU:
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1335
1529 Author: Date:
2005 SEQUOIA (RM1146U)
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 occupant classification ECU and the occupant clas-
sification sensors.
OK:
The connectors are connected securely.
NG Connect connectors, then go to step 1.
OK
3 Check seat wire No. 1 (short to B+).
PREPARATION:
(a) Disconnect the connector from the occupant classifica-
tion 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.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
O7±5 (SVC3) ±
Body groundIgnition switch ONBelow 1 V
O7±6 (SVC4) ±
Body groundIgnition switch ONBelow 1 V
O7±11 (SVC1) ±
Body groundIgnition switch ONBelow 1 V
O7±12 (SVC2) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace seat wire No. 1.
OK
Page 1538 of 4323
H23821H43699H24595
SVC1SVC2 SVC4 SVC3
O7 Occupant Classification ECU:
O8
O9
O10
O11SVC1
SVC2
SVC3
SVC4 Occupant Classification Sensor
Front LH:
Occupant Classification Sensor
Front RH:
Occupant Classification Sensor
Rear LH:
Occupant Classification Sensor
Rear RH:
DI±1336
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1530 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check seat wire No. 1 (open).
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.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
O8±1 (SVC1) ±
O7±11 (SVC1)AlwaysBelow 1 W
O9±1 (SVC2) ±
O7±12 (SVC2)AlwaysBelow 1 W
O10±1 (SVC3) ±
O7±5 (SVC3)AlwaysBelow 1 W
O11±1 (SVC4) ±
O7±6 (SVC4)AlwaysBelow 1 W
NG Repair or replace seat wire No. 1.
OK
Page 1540 of 4323
DI±1338
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1532 Author: Date:
2005 SEQUOIA (RM1146U)
7 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.
(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 B1793 is not output.
HINT:
Codes other than DTC B1793 may be output at this time, but they are not related to this check.
NG Go to step 8.
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).
Page 1542 of 4323
DI±1340
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1534 Author: Date:
2005 SEQUOIA (RM1146U)
11 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 B1793 is not output.
HINT:
Codes other than DTC B1793 may be output at this time, but they are not related to this check.
NG Go to step 12.
OK
END
Page 1548 of 4323
DI±1346
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1540 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check DTC.
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.
(c) Connect the connector to the occupant classification ECU.
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, and wait for at least 10 seconds.
(e) Using the hand±held tester, check the DTCs of the occupant classification ECU (see page DI±1147).
OK:
DTC B1794 is not output.
HINT:
Codes other than DTC B1794 may be output at this time, but they are not related to this check.
NG Go to step 5.
OK
From the results of the above inspection, the malfunctioning part can not be considered normal.
To make sure of this, use the simulation method to check (see page DI±1137).
Page 1552 of 4323
DI±1350
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1544 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1796 Sleep Operation Failure Of Occupant
Classification ECU
CIRCUIT DESCRIPTION
During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition
switch is off.
In this mode, if occupant classification ECU detects an internal malfunction, DTC B1796 is output.
DTC No.DTC Detecting ConditionTrouble Area
B1796Occupant classification ECU malfunctionOccupant classification ECU
HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the supplemental restraint system, check
the DTCs stored in the occupant classification ECU. When DTC B1796 is output, perform troubleshooting
for the DTC.
INSPECTION PROCEDURE
1 Check DTC.
CHECK:
(a) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(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 B1796 is not output.
HINT:
Codes other than DTC B1796 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).
DIDHH±01
Page 1554 of 4323
DI±1352
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1546 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1800/51 Short in D Squib Circuit
DTC B1801/51 Open in D Squib Circuit
DTC B1802/51 Short in D Squib Circuit (to Ground)
DTC B1803/51 Short in D Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, the spiral cable and the steering wheel pad.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the D squib circuit.
DTC No.DTC Detection ConditionTrouble Area
B1800/51
The airbag sensor assembly receives a line short circuit
signal 5 times in the D squib circuit during primary check.
Spiral cable malfunction
D squib malfunction
Airbag sensor assembly malfunctionSteering wheel pad (D squib)
Airbag sensor assembly
Spiral cable
Cowl wire
B1801/51
The airbag sensor assembly receives an open circuit sig-
nal in the D squib circuit for 2 seconds.
Spiral cable malfunction
D squib malfunction
Airbag sensor assembly malfunctionSteering wheel pad (D squib)
Airbag sensor assembly
Spiral cable
Cowl wire
B1802/51
The airbag sensor assembly receives a short circuit to
ground signal in the D squib circuit for 0.5 seconds.
Spiral cable malfunction
D squib malfunction
Airbag sensor assembly malfunctionSteering wheel pad (D squib)
Airbag sensor assembly
Spiral cable
Cowl wire
B1803/51
The airbag sensor assembly receive a short to B+ circuit
signal in the D squib circuit for 0.5 seconds.
Spiral cable malfunction
D squib malfunction
Airbag sensor assembly malfunctionSteering wheel pad (D squib)
Airbag sensor assembly
Spiral cable
Cowl wire
DIDHI±01
Page 1555 of 4323
H01451
Airbag Sensor Assembly
A205
D+ Y±B D Squib
A23
Spiral CableA206
D± Y 1
2
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1353
1547 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Page 1556 of 4323
DI±1354
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1548 Author: Date:
2005 SEQUOIA (RM1146U)
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 DTC.
CHECK:
Proceed to each step according to how to read DTC.
(1) If using the hand±held tester (read the 5±digit of DTC):
Using the hand±held tester, check the DTCs (see page DI±1147).
RESULT:
DTC B1800 is output.A
DTC B1801 is output.B
DTC B1802 is output.C
DTC B1803 is output.D
(2) If not using the hand±held tester (read the 2±digit of DTC):
Check the DTCs (see page DI±1147).
RESULT:
DTC 51 is output.E
HINT:
Codes other than DTC B1800, B1801, B1802, B1803 and DTC 51 may be output at this time, but they are
not related to this check.
B Go to step 4.
C Go to step 5.
D Go to step 6.
E Go to step 7.
A
Page 1557 of 4323
H23795H23974
H01001H23987
D+
D±
Color: Orange
D Squib
Spiral
CableA
B C D E FAirbag
Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1355
1549 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check connector.
CHECK:
Check that the spiral cable connectors (on the steering wheel pad side) are not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
NG Replace spiral cable (see page RS±21).
OK
3 Check D squib circuit (short).
PREPARATION:
Release the activation prevention mechanism built into con-
nector ºBº (see page DI±1137).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
D+ ± D±Always1 MW or higher
NG Go to step 13.
OK
Go to step 10.