Toyota Sequoia (2005). Manual — part 421
H01018
H23474
Airbag
Sensor
Assembly
DC
P/T Squib LH
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1479
1673
12
Check front seat outer belt LH (P/T squib LH).
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)
From the step 10:
Disconnect the service wire from connector ”C”.
(d)
Connect the connector to the front seat outer belt LH.
(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
(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)
OK:
DTC B1905, B1906, B1907 or B1908 is not output.
HINT:
Codes other than DTC B1905, B1906, B1907 and B1908 may
be output at this time, but they are not related to this check.
NG
Replace front seat outer belt LH
(see page
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
HINT:
Perform the simulation method by selecting the check mode with the hand–held tester (see page
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–1480
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1674
DTC
Normal
Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage–increase circuit (DC–DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage–increase circuit (DC–DC converter) functions to increase the
voltage of the SRS to normal voltage.
A malfunction in this circuit is displayed differently from other codes. The source voltage drop is indicated
when the SRS warning light comes on without showing any DTCs.
A malfunction in this circuit is not recorded in the airbag sensor assembly. The SRS warning light automati-
cally goes off when the source voltage returns to normal.
DTC No.
Detection Item
(Normal)
Source voltage drop
DIDHS–01
H24000
Airbag Sensor
Assembly
IG2
A20
B
Engine Room J/B
Instrument Panel J/B
Instrument Panel J/B
I18
Ignition SW
21
1A
3
1J
7
1C
2
1C
3
AM2
IG2
B–R
6
5
IGN1
AM2
2C
1
2D
1
W–R
W–R
B
4
5
B
F10
Fusible Link
Block
E1
E2
A20
25
A20
26
W–B
W–B
1A
6
1F
9
1F
10
1A
8
W–B
W–B
A
A
J8
J/C
IE
Battery
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1481
1675
WIRING DIAGRAM
H23040
IG2
A20
DI–1482
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1676
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 battery.
CHECK:
Measure the voltage of the battery.
OK:
Voltage: 11 to 14 V
NG
Replace battery.
OK
2
Check source voltage (power source).
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 Connection
Condition
Specified Condition
A20–21 (IG2) –
Body ground
Ignition switch ON
10 to 14 V
NG
Repair or replace wire harness (battery – airbag
sensor assembly).
OK
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