Toyota Sequoia (2005). Manual — part 346
H03354
H23983
H24012
Airbag
Sensor
Assembly
+SL
–SL
A
B
D
E
C
F
Front Airbag
Sensor LH
Cowl Wire
Engine Room Main Wire
IA3
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1179
1373
11
Check engine room main wire (short to ground).
PREPARATION:
Disconnect the engine room main wire connector from the cowl
wire.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Condition
Specified Condition
IA3–1 (+SL) –
Body ground
Always
1 M
Ω
or higher
IA3–2 (–SL) –
Body ground
Always
1 M
Ω
or higher
NG
Repair or replace engine room main wire.
OK
Repair or replace cowl wire.
H02751
Airbag Sensor Assembly
S16
Side Airbag Sensor Assembly RH
A21
22
VUPR
W
2
ESR
A21
20
B
1
VUPR
ESR
DI–1180
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1374
DTC
B1620/21 Side Airbag Sensor Assembly (RH)
Malfunction
CIRCUIT DESCRIPTION
The side airbag sensor assembly RH consists of the safing sensor, the diagnostic circuit, the lateral decelera-
tion sensor, etc.
If the airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether
or not the SRS should be activated.
DTC B1620/21 is recorded when a malfunction is detected in the side airbag sensor assembly RH circuit.
DTC No.
DTC Detection Condition
Trouble Area
B1620/21
The airbag sensor assembly receives a line short circuit
signal, an open circuit signal, a short circuit to ground sig-
nal or a short circuit to B+ signal in the side airbag sensor
assembly RH circuit for 2 seconds.
Side airbag sensor assembly RH malfunction
Airbag sensor assembly malfunction
Side airbag sensor assembly RH
Airbag sensor assembly
Floor wire
WIRING DIAGRAM
DIDGU–01
C84208
H10600 H43425
H24649
CG
TC
DTC B1620/21
DLC3
Side Airbag Sensor
Assembly RH
Airbag
Sensor
Assembly
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1181
1375
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.
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
(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 B1620/21 is not output.
HINT:
Codes other than DTC B1620/21 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
H01015
C91384 G27650
H23090
Side Airbag
Sensor Assembly RH
Floor Wire
Airbag
Sensor
Assembly
VUPR
ESR
SST
A
B
C
D
VUPR
ESR
A21
S16
DI–1182
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1376
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 the side airbag sensor
assembly RH.
OK:
The connectors are connected securely.
NG
Connect connectors, then go to step 1.
OK
3
Check floor wire (open).
PREPARATION:
(a)
Disconnect the connectors from the airbag sensor as-
sembly and the side airbag sensor assembly RH.
(b)
Using SST, connect S16–2 (VUPR) and S16–1 (ESR) of
connector ”C”.
SST
09843–18040
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Condition
Specified Condition
A21–22 (VUPR) –
A21–20 (ESR)
Always
Below 1
Ω
NG
Repair or replace floor wire.
OK
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