Page 1609 of 4323
H01454
Airbag Sensor Assembly
A20 P2+1
Y±R A22
P Squib
A20 P2±2
Y±G 3
4
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1407
1601 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Page 1610 of 4323

DI±1408
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1602 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:
(a) 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 B1815 is output.A
DTC B1816 is output.B
DTC B1817 is output.C
DTC B1818 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 54 is output.E
HINT:
Codes other than DTC B1815, B1816, B1817, B1818 and DTC 54 may be output at this time, but they are
not related to this check.
B Go to step 3.
C Go to step 4.
D Go to step 5.
E Go to step 6.
A
Page 1611 of 4323
H23635
P2±
P2+ P Squib
(Dual stage ±
2nd step)
A
B C D
A22
Cowl Wire
Airbag
Sensor
Assembly
H23635
P2±
P2+ P Squib
(Dual stage ±
2nd step)
A
B C D
A22
Cowl Wire
Airbag
Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1409
1603 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check cowl wire (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
A22±3 (P2+) ±
A22±4 (P2±)Always1 MW or higher
NG Repair or replace cowl wire.
OK
Go to step 8.
3 Check cowl wire (open).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A22±3 (P2+) ±
A22±4 (P2±)AlwaysBelow 1 W
NG Repair or replace cowl wire.
OK
Go to step 9.
Page 1612 of 4323

H23635
P2±
P2+ P Squib
(Dual stage ±
2nd step)
A
B C D
A22
Cowl Wire
Airbag
Sensor
Assembly
H23635
P2±
P2+ P Squib
(Dual stage ±
2nd step)
A
B C D
A22
Cowl Wire
Airbag
Sensor
Assembly
DI±1410
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1604 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check cowl wire (short to ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A22±3 (P2+) ±
Body groundAlways1 MW or higher
A22±4 (P2±) ±
Body groundAlways1 MW or higher
NG Repair or replace cowl wire.
OK
Go to step 9.
5 Check cowl wire (short to B+).
PREPARATION:
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
A22±3 (P2+) ±
Body groundIgnition switch ONBelow 1 V
A22±4 (P2±) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace cowl wire.
OK
Go to step 9.
Page 1613 of 4323

H23635
P2±
P2+ P Squib
(Dual stage ±
2nd step)
A
B C D
A22
Cowl Wire
Airbag
Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1411
1605 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check cowl wire (P squib circuit, dual stage ± 2nd step).
PREPARATION:
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
A22±3 (P2+) ±
Body groundIgnition switch ONBelow 1 V
A22±4 (P2±) ±
Body groundIgnition switch ONBelow 1 V
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
A22±3 (P2+) ±
A22±4 (P2±)AlwaysBelow 1 W
A22±3 (P2+) ±
Body groundAlways1 MW or higher
A22±4 (P2±) ±
Body groundAlways1 MW or higher
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
A22±3 (P2+) ±
A22±4 (P2±)Always1 MW or higher
NG Repair or replace cowl wire.
OK
Page 1614 of 4323

H10600H01024H01078H23362
Airbag
Sensor
Assembly
DTC 54 DLC3
TC CG
P Squib
(Dual stage ±
2nd step)
DC
DI±1412
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1606 Author: Date:
2005 SEQUOIA (RM1146U)
7 Replace front passenger airbag assembly (P squib, dual stage ± 2nd step).
PREPARATION:
(a) Replace the front passenger airbag assembly (see page
RS±33).
HINT:
Perform the inspection using parts from a normal vehicle if pos-
sible.
(b) Connect the connectors to the airbag sensor assembly.
(c) 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, 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 54 is not output.
HINT:
Codes other than DTC 54 may be output at this time, but they
are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
OK
END
Page 1615 of 4323
H01023H23358
Airbag
Sensor
Assembly P Squib
(Dual stage ±
2nd step)
C D
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1413
1607 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connectors to the airbag sensor assembly.
(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, 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 B1815 is not output.
HINT:
Codes other than DTC B1815 may be output at this time, but
they are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
OK
Go to step 10.
Page 1616 of 4323

H23802H01023H23991
P2+ P2±Airbag
Sensor
Assembly P Squib
(Dual stage ±
2nd step)
DC
SST
Cowl Wire
DI±1414
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1608 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check airbag sensor assembly.
PREPARATION:
(a) From the step 5:
Turn the ignition switch to the LOCK position.
(b) From the step 5:
Disconnect the negative (±) terminal cable from the bat-
tery, and wait for at least 90 seconds.
(c) Connect the connectors to the airbag sensor assembly.
(d) Using SST, connect A22±3 (P2+) and A22±4 (P2±) of
connector ºCº.
SST 09843±18040
(e) 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, 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 B1816, B1817 or B1818 is not output.
HINT:
Codes other than DTC B1816, B1817 and B1818 may be out-
put at this time, but they are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
OK