TOYOTA SEQUOIA 2001 Service Repair Manual

H41440H23351
Spiral
CableAirbag
Sensor
Assembly
D2+
D2±
D Squib
(Dual stage ±
2nd step)
B C ED FACowl Wire
A23
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1399
1593 Author: Date:
2005 SEQUOIA (RM1146U)
17 Check cowl wire (short to ground).
PREPARATION:
Disconnect the cowl wire connector from the spiral cable.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A23±4 (D2+) ±
Body groundAlways1 MW or higher
A23±3 (D2±) ±
Body groundAlways1 MW or higher
NG Repair or replace cowl wire.
OK

H41479H23350
Spiral
CableAirbag
Sensor
Assembly
D2+
D2±
D Squib
(Dual stage ±
2nd step)
Color: Black
A
B D EC F
DI±1400
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1594 Author: Date:
2005 SEQUOIA (RM1146U)
18 Check spiral cable (short to ground).
CHECK:
(a) Measure the resistance according to the value(s) in the
table below.
OK:
Tester ConnectionConditionSpecified Condition
D2+ ± Body groundAlways1 MW or higher
D2± ± Body groundAlways1 MW or higher
NG Replace spiral cable (see page RS±21).
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).
HINT:

Perform the simulation method by selecting the check mode with the hand±held tester (see page
DI±1151).

After selecting the check mode, perform the simulation method by wiggling each connector of the air-
bag system or driving the vehicle on a city or rough road (see page DI±1151).

H41440H23351
Spiral
CableAirbag
Sensor
Assembly
D2+
D2±
D Squib
(Dual stage ±
2nd step)
B C ED FACowl Wire
A23
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1401
1595 Author: Date:
2005 SEQUOIA (RM1146U)
19 Check cowl wire (short to B+).
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 cowl wire connector from the spiral cable.
(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
A23±4 (D2+) ±
Body groundIgnition switch ONBelow 1 V
A23±3 (D2±) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace cowl wire.
OK

H41479H23350
Spiral
CableAirbag
Sensor
Assembly
D2+
D2±
D Squib
(Dual stage ±
2nd step)
Color: Black
A
B D EC F
DI±1402
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1596 Author: Date:
2005 SEQUOIA (RM1146U)
20 Check spiral cable (short to B+).
CHECK:
Measure the voltage according to the value(s) in the table be-
low when the ignition switch is in the ON position.
OK:
Tester ConnectionConditionSpecified Condition
D2+ ± Body groundIgnition switch ONBelow 1 V
D2± ± Body groundIgnition switch ONBelow 1 V
NG Replace spiral cable (see page RS±21).
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).
HINT:

Perform the simulation method by selecting the check mode with the hand±held tester (see page
DI±1151).

After selecting the check mode, perform the simulation method by wiggling each connector of the air-
bag system or driving the vehicle on a city or rough road (see page DI±1151).

H41440H23351
Spiral
CableAirbag
Sensor
Assembly
D2+
D2±
D Squib
(Dual stage ±
2nd step)
B C ED FACowl Wire
A23
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1403
1597 Author: Date:
2005 SEQUOIA (RM1146U)
21 Check cowl wire.
PREPARATION:
(a) Restore the released activation prevention mechanism of
connector ºBº to the original condition.
(b) Disconnect the cowl wire connector from the spiral cable.
(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.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A23±4 (D2+) ±
Body groundIgnition switch ONBelow 1 V
A23±3 (D2±) ±
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
A23±4 (D2+) ±
A23±3 (D2±)AlwaysBelow 1 W
A23±4 (D2+) ±
Body groundAlways1 MW or higher
A23±3 (D2±) ±
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
A23±4 (D2+) ±
A23±3 (D2±)Always1 MW or higher
NG Repair or replace cowl wire.
OK

H41479H23350
Spiral
CableAirbag
Sensor
Assembly
D2+
D2±
D Squib
(Dual stage ±
2nd step)
Color: Black
A
B D EC F
DI±1404
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1598 Author: Date:
2005 SEQUOIA (RM1146U)
22 Check spiral cable.
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
D2+ ± Body groundIgnition switch ONBelow 1 V
D2± ± 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
D2+ ± D2±AlwaysBelow 1 W
D2+ ± Body groundAlways1 MW or higher
D2± ± body groundAlways1 MW or higher
PREPARATION:
Release the activation prevention mechanism built into con-
nector ºDº (see page DI±1137).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
D2+ ± D2±Always1 MW or higher
NG Replace spiral cable (see page RS±21).
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).

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1405
1599 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:

Perform the simulation method by selecting the check mode with the hand±held tester (see page
DI±1151).

After selecting the check mode, perform the simulation method by wiggling each connector of the air-
bag system or driving the vehicle on a city or rough road (see page DI±1151).

DI±1406
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1600 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1815/54 Short in P Squib (Dual stage ± 2nd step)
Circuit
DTC B1816/54 Open in P Squib (Dual stage ± 2nd step)
Circuit
DTC B1817/54 Short in P Squib (Dual stage ± 2nd step)
Circuit (to Ground)
DTC B1818/54 Short in P Squib (Dual stage ± 2nd step)
Circuit (to B+)
CIRCUIT DESCRIPTION
The P squib (Dual stage ± 2nd step) circuit consists of the airbag sensor assembly and the front passenger
airbag assembly.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the P squib (Dual stage ± 2nd step) circuit.
DTC No.DTC Detection ConditionTrouble Area
B1815/54

The airbag sensor assembly receives a line short circuit
signal 5 times in the P squib (Dual stage ± 2nd step) cir-
cuit during primary check.

P squib malfunction

Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib, Dual stage ± 2nd
step)

Airbag sensor assembly

Cowl wire
B1816/54

The airbag sensor assembly receives an open circuit sig-
nal in the P squib (Dual stage ± 2nd step) circuit for 2 se-
conds.

P squib malfunction

Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib, Dual stage ± 2nd
step)

Airbag sensor assembly

Cowl wire
B1817/54

The airbag sensor assembly receives a short circuit to
ground signal in the P squib (Dual stage ± 2nd step) circuit
for 0.5 seconds.

P squib malfunction

Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib, Dual stage ± 2nd
step)

Airbag sensor assembly

Cowl wire
B1818/54

The airbag sensor assembly receives a short to B+ circuit
signal in the P squib (Dual stage ± 2nd step) circuit for 0.5
seconds.

P squib malfunction

Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib, Dual stage ± 2nd
step)

Airbag sensor assembly

Cowl wire
DIDHL±01

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

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