Page 1017 of 2572

H01017
H10600 H01085H43107H43142
P/T Squib LH
DLC3
TC
CG
DTC B0138/72Airbag
Sensor
Assy
Center
PL-
PL+
Floor Wire No.2
Service Wire
C
D
P13
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1317
1507 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 CHECK AIR BAG SENSOR ASSY CENTER
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the bat-
tery, and wait at least for 90 seconds.
(c) Connect the connector to the airbag sensor assy center.
(d) Using a service wire, connect P13-1 (PL+) and P13-2
(PL-) of connector ºCº.
NOTICE:
Twist the end of the service wire in order to insert it
into the connector.
Do not forcibly insert the twisted service wire into the
terminal of the connector when connecting.
(e) Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
(f) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(g) Clear the DTCs stored in memory (see page 05-1215).
(h) Turn the ignition switch to the LOCK position.
(i) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(j) Check the DTCs (see page 05-1215).
OK:
DTC B0138/72 is not output.
HINT:
Codes other than code B0138/72 may be output at this time, but
they are not related to this check.
NG REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-53)
OK
Page 1018 of 2572

H10600 H01018H01085H40064
P/T Squib LH
DLC3
CG
DTC B0138/72
TCAirbag
Sensor
Assy
Center C D
05-1318
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1508 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK FRONT SEAT OUTER BELT ASSY LH(P/T SQUIB LH)
(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 service wire from connector ºCº.
(d) Connect the connector to the front seat outer belt assy
LH.
(e) Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
(f) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(g) Clear the DTCs stored in memory (see page 05-1215).
(h) Turn the ignition switch to the LOCK position.
(i) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(j) Check the DTCs (see page 05-1215).
OK:
DTC B0138/72 is not output.
HINT:
Codes other than code B0138/72 may be output at this time, but
they are not related to this check.
NG REPLACE FRONT SEAT OUTER BELT ASSY LH
(SEE PAGE 61-4)
OK
USE SIMULATION METHOD TO CHECK
HINT:
Before performing the simulation method, check that the airbag sensor assy center is in check mode
(see page 05-1218).
Perform the simulation method by selecting the check mode with the hand-held tester (see page
05-1218).
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 05-1218).
Page 1019 of 2572

05-1446
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1636 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 assy RH (buckle switch 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 ConditionTrouble Area
B1771
When the occupant classification ECU receives a line short
signal, open signal, short to ground signal or B+ short signal
in the passenger side buckle switch circuit for 2 seconds.
Passenger side buckle switch malfunction
Occupant classification ECU malfunction
Front seat inner belt assy RH (Buckle switch RH)
Front seat wire RH
Occupant classification ECU
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system,
perform troubleshooting for DTC B1771 of the occupant classification system.
Use the hand-held tester to check the DTC of the occupant classification ECU, otherwise the DTC
cannot be read.
05IWO-01
Page 1020 of 2572
H43432
B17
Buckle SW RH
O6 2
1L
GR9
5BSW
BGND O6 Occupant Classification ECU
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1447
1637 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM
Page 1021 of 2572

05-1448
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1638 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
If troubleshooting (wire harness inspection) is difficult to perform, remove the front RH seat assy instal-
lation 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
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page 05-1215).
HINT:
First clear DTCs stored in the occupant classification ECU memory and then in the airbag sensor assy
center memory.
Use the hand-held tester to clear the DTC of the occupant classification ECU, otherwise the DTC can-
not be cleared.
(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 (see page 05-1215).
OK:
DTC B1771 is not output.
HINT:
Codes other than code B1771 may be output at this time, but they are not related to this check.
NG Go to step 2
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-1207)
2 CHECK CONNECTION OF CONNECTORS
(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) Check that the connectors are properly connected to the occupant classification ECU and the front
seat inner belt assy RH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
Page 1022 of 2572

H43103H43111H43103H43111H43130
BGND Front Seat Inner
Belt Assy RHFront Seat Wire RHOccupant
Classification ECU
CB DA
BSWO6
H43104H43111H43698H43104H43111H43698H43418
BGND Front Seat Inner
Belt Assy RHFront Seat Wire RHOccupant
Classification ECU
CB DA
BSW
O6B17
12
Service Wire
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1449
1639 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK FRONT SEAT WIRE RH (TO B+)
(a) Disconnect the connectors from the occupant classifica-
tion ECU and the front seat inner belt assy RH.
(b) Connect the negative (-) terminal cable to the battery.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
O6-9 (BSW) -
Body groundIgnition switch ONBelow 1 V
O6-5 (BGND) -
Body groundIgnition switch ONBelow 1 V
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
4 CHECK FRONT SEAT WIRE RH (OPEN)
(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) Using a service wire, connect B17-1 and B17-2 of con-
nector ºCº.
NOTICE:
Do not forcibly insert a service wire into the terminals of the
connector when connecting.
(d) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
O6-9 (BSW) -
O6-5 (BGND)AlwaysBelow 1 W
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
Page 1023 of 2572
H43103H43111H43103H43111H43130
BGND Front Seat Inner
Belt Assy RHFront Seat Wire RHOccupant
Classification ECU
CB DA
BSW
O6
H43103H43111H43103H43111H43130
BGND Front Seat Inner
Belt Assy RHFront Seat Wire RHOccupant
Classification ECU
CB DA
BSW
O6
05-1450
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1640 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 CHECK FRONT SEAT WIRE RH (SHORT)
(a) Disconnect the service wire from connector ºCº.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
O6-9 (BSW) -
O6-5 (BGND)Always1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
6 CHECK FRONT SEAT WIRE RH (TO GROUND)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
O6-9 (BSW) -
Body groundAlways1 MW or Higher
O6-5 (BGND) -
Body groundAlways1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
Page 1024 of 2572

- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1451
1641 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 RECHECK DTC
(a) Connect the connectors to the occupant classification ECU and the front seat inner belt assy RH.
(b) Connect the negative (-) terminal cable to the battery.
(c) Turn the ignition switch to the ON position.
(d) Clear the DTCs stored in memory (see page 05-1215).
HINT:
First clear DTCs stored in the occupant classification ECU memory and then in the airbag sensor assy
center memory.
Use the hand-held tester to clear the DTC of the occupant classification ECU, otherwise the DTC can-
not be cleared.
(e) Turn the ignition switch to the LOCK position.
(f) Turn the ignition switch to the ON position.
(g) Using the hand-held tester, check the DTCs (see page 05-1215).
OK:
DTC B1771 is not output.
HINT:
Codes other than code B1771 may be output at this time, but they are not related to this check.
NG Go to step 8
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-1207)
8 REPLACE FRONT SEAT INNER BELT ASSY RH
(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) Replace the front seat inner belt assy RH (see page 72-1 1, 72-19).
(d) Connect the negative (-) terminal cable to the battery.
(e) Turn the ignition switch to the ON position.
(f) Clear the DTCs stored in memory (see page 05-1215).
HINT:
First clear DTCs stored in the occupant classification ECU memory and then in the airbag sensor assy
center memory.
Use the hand-held tester to clear the DTC of the occupant classification ECU, otherwise the DTC can-
not be cleared.
(g) Turn the ignition switch to the LOCK position.
(h) Turn the ignition switch to the ON position.
(i) Using the hand-held tester, check the DTCs (see page 05-1215).
OK:
DTC B1771 is not output.
HINT:
Codes other than code B1771 may be output at this time, but they are not related to this check.
NG Go to step 9
OK
END