Toyota Sequoia (2005). Manual — part 387
H23999
Occupant
Classification ECU
O6 +B
1
BL1
1
W–R
J49
O6
IG
7
O6
GND
3
W–R
C
J/C
I
J48
W–R
2
3D
1
3A
Sub J/B No. 3
W–R
W–R
W–R
W–B
W–B
BL1
6
BL1
2
B–O
B–O
J45
B
J/C
I
J44
B–O
2
4C
2
4D
Sub J/B No. 4
B–O
Instrument Panel J/B
17
1E
2
1C
IGN1
3
1C
2
1E
3
1J
7
1J
I18
Ignition SW
IG2
B–R
AM2
6
5
W–R
W–R
Engine Room J/B
8
2C
1
2D
ECU–B
Short Pin
1
2C
AM2
F10
FL Block
5
4
B
B
Battery
BK
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1343
1537
WIRING DIAGRAM
DI–1344
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1538
INSPECTION PROCEDURE
1
Check battery.
CHECK:
Measure the voltage of the battery.
OK:
Voltage: 11 to 14 V
NG
Replace battery.
OK
2
Check fuse.
CHECK:
Check the ECU–B fuse.
OK:
Resistance: Below 1
Ω
NG
Replace fuse.
OK
H23821
O6
+B
GND
Occupant Classification ECU:
IG
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1345
1539
3
Check seat wire No. 1 (source voltage).
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 connector from the occupant classifica-
tion ECU.
(d)
Connect the negative (–) terminal cable to the battery.
CHECK:
(a)
Turn the ignition switch to the ON position.
(b)
Measure the voltage and resistance according to the val-
ue(s) in the table below.
OK:
Tester Connection
Condition
Specified Condition
O6–1 (+B) – Body ground
Ignition switch ON
10 to 14 V
O6–3 (GND) –
Body ground
Always
Below 1
Ω
O6–7 (IG) – Body ground
Ignition switch ON
10 to 14 V
NG
Repair or replace seat wire No. 1.
OK
DI–1346
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1540
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
).
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
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
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