Toyota Sequoia (2005). Manual — part 364
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DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1251
1445
DTC
B1771
Passenger Side Buckle Switch Circuit
Malfunction
CIRCUIT DESCRIPTION
The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner
belt RH.
DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit.
Troubleshoot DTC B1771 first when the DTC B1771 and B1795 are output simultaneously.
DTC No.
DTC Detecting Condition
Trouble Area
B1771
The occupant classification ECU receives a line short
circuit signal, an open circuit signal, a short circuit to
ground signal or a short circuit to B+ signal in the passen-
ger side buckle switch circuit for 2 seconds.
Passenger side buckle switch malfunction
Occupant classification ECU malfunction
Front seat inner belt RH
Occupant classification ECU
Seat wire No. 1
HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the supplemental restraint system, check
the DTCs stored in the occupant classification ECU. When DTC B1771 is output, perform troubleshooting
for the DTC.
DIDH4–01
H23244
Occupant Classification ECU
O6
O6
R
B17
Buckle SW RH
L
1
2
9
5
BSW
BGND
DI–1252
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DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1446
WIRING DIAGRAM
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DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1253
1447
INSPECTION PROCEDURE
HINT:
If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installa-
tion bolts to see the under surface of seat cushion.
In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time
may cause a problem, such as seat rail deformation. Hold the seat only as necessary.
1
Check DTC.
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.
(e)
Using the hand–held tester, check the DTCs of the occupant classification ECU (see page
OK:
DTC B1771 is not output.
HINT:
Codes other than DTC B1771 may be output at this time, but they are not related to this check.
NG
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
H43103
H43111
H23819
Occupant
Classification ECU
BGND
BSW
C
B
D
A
Front Seat
Inner Belt RH
O6
Seat Wire No. 1
DI–1254
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DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1448
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 occupant classification ECU and the front seat inner
belt RH.
OK:
The connectors are connected securely.
NG
Connect connectors, then go to step 1.
OK
3
Check seat wire No. 1 (short to B+).
PREPARATION:
(a)
Disconnect the connectors from the occupant classifica-
tion ECU and the front seat inner belt RH.
(b)
Connect the negative (–) terminal cable to the battery.
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
O6–9 (BSW) –
Body ground
Ignition switch ON
Below 1 V
O6–5 (BGND) –
Body ground
Ignition switch ON
Below 1 V
NG
Repair or replace seat wire No. 1.
OK
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