2001 TOYOTA HIGHLANDER o2 sensor
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05-1504
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1694 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 B1793 is not output.
HINT:
Codes other than code B1793 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 occu-
pant classification sensors.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
Page 1078 of 2572
H43111
SVC1SVC2 SVC4 SVC3
O7
H43111
SVC1SVC2 SVC4 SVC3
O7
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1505
1695 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK FRONT SEAT WIRE RH (TO B+)
(a) Disconnect the occupant classification ECU connector
and the 4 occupant classification sensor connectors.
(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
O7-5 (SVC3) -
Body groundIgnition switch ONBelow 1 V
O7-6 (SVC4) -
Body groundIgnition switch ONBelow 1 V
O7-1 1 (SVC1) -
Body groundIgnition switch ONBelow 1 V
O7-12 (SVC2) -
Body groundIgnition switch ONBelow 1 V
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
4 CHECK FRONT SEAT WIRE RH (TO GROUND)
(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) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
O7-5 (SVC3) -
Body groundAlways1 MW or Higher
O7-6 (SVC4) -
Body groundAlways1 MW or Higher
O7-1 1 (SVC1) -
Body groundAlways1 MW or Higher
O7-12 (SVC2) -
Body groundAlways1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
Page 1080 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1507
1697 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 RECHECK DTC
(a) Connect the occupant classification ECU connector and the 4 occupant classification sensor connec-
tors.
(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 B1793 is not output.
HINT:
Codes other than code B1793 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 OCCUPANT CLASSIFICATION ECU
(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 occupant classification ECU (see page 60-64).
HINT:
Perform the inspection using parts from a normal vehicle when possible.
9 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
NG Go to step 12
OK
Page 1081 of 2572
05-1508
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1698 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
10 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform ºSensitivity checkº (see page 05-1203).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 12
OK
11 RECHECK DTC
(a) Connect the negative (-) terminal cable to the battery.
(b) Turn the ignition switch to the ON position.
(c) 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.
(d) Turn the ignition switch to the LOCK position.
(e) Turn the ignition switch to the ON position.
(f) Using the hand-held tester, check the DTCs (see page 05-1215).
OK:
DTC B1793 is not output.
HINT:
Codes other than code B1793 may be output at this time, but they are related to this check.
NG Go to step 12
OK
END
12 REPLACE SEAT ADJUSTER FRAME ASSY
(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 seat adjuster frame assy (see page 72-1 1, 72-19).
13 CHECK PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
Page 1083 of 2572
05-1510
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1700 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1795 OCCUPANT CLASSIFICATION ECU
MALFUNCTION
CIRCUIT DESCRIPTION
DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.
Troubleshoot DTC B1771 first when the DTC B1771 and B1795 are output simultaneously.
DTC No.DTC Detecting ConditionTrouble Area
B1795
Occupant classification ECU circuit malfunction
Occupant classification ECU malfunction
When the occupant classification ECU receives a short to
ground signal in the passenger side buckle switch circuit
for 2 seconds.
The occupant classification ECU receives the ignition
switch LOCK to ON signal 50 times in a row when a mal-
function occurs in the power circuit for the occupant clas-
sification ECU (LOCK to ON to LOCK should be counted
as once).
Occupant classification ECU
Front seat wire RH
ECU-B Fuse
Front seat inner belt assy RH (Buckle switch RH)
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system,
perform troubleshooting for DTC B1795 of the occupant classification sensor.
Use the hand-held tester to check the DTC of the occupant classification ECU, otherwise the DTC
cannot be read.
05IX0-03
Page 1086 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1513
1703 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1796 SLEEP OPERATION FAILURE OF
OCCUPANT CLASSIFICATION ECU
CIRCUIT DESCRIPTION
During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition
switch is off. In this mode, if occupant classification ECU detects an internal malfunction, DTC B1796 is out-
put.
DTC No.DTC Detecting ConditionTrouble Area
B1796Occupant classification ECU malfunctionOccupant classification ECU
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system,
perform troubleshooting for the DTC B1796 of the occupant classification ECU.
Use the hand-held tester to check the DTC of the occupant classification ECU, otherwise the DTC
cannot be read.
INSPECTION PROCEDURE
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 check the DTC of the occupant classification ECU, otherwise the DTC
cannot be cleared.
(c) Turn the ignition switch to the LOCK position, and wait for at least 10 seconds.
(d) Turn the ignition switch to the ON position.
(e) Using the hand-held tester, check the DTCs (see page 05-1215).
OK:
DTC B1796 is not output.
HINT:
Codes other than code B1796 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)
05IX1-01
Page 1102 of 2572
H10600H10600H10600H41086
DLC3DTC B1100/31
CG
TC
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1319
1509 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1100/31 AIRBAG SENSOR ASSY CENTER
MALFUNCTION
CIRCUIT DESCRIPTION
The airbag sensor assy center consists of a airbag sensor assy center, safing sensor, drive circuit, diagnosis
circuit and ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the SRS must be activated, and detects
diagnosis system malfunction.
DTC B1100/31 is recorded when occurrence of a malfunction in the airbag sensor assy center is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1100/31Airbag sensor assy center malfunctionAirbag sensor assy center
HINT:
When a trouble code is displayed simultaneously with B1100/31, repair the malfunction indicated by this
code (except B1100/31) first.
INSPECTION PROCEDURE
1 CHECK AIR BAG SENSOR ASSY CENTER
(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 05-1215).
(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) Check the DTCs (see page 05-1215).
OK:
DTC B1100/31 is not output.
NG REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-53)
OK
USE SIMULATION METHOD TO CHECK
05IVG-01
Page 1103 of 2572
H40997
DLC3DTC B1135/24
CG
TCAirbag
Sensor
Assy
Center
05-1320
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1510 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1135/24 HALF CONNECTION IN AIRBAG SENSOR
ASSY CENTER CONNECTORS
CIRCUIT DESCRIPTION
The airbag sensor assy center detects partial connection of connector.
DTC B1135/24 is recorded when the airbag sensor assy center detects an open in the electrical connection
check mechanism of the airbag sensor connector or in the airbag sensor circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1135/24
Malfunction of electrical connection check mechanism of
airbag sensor assy center connector
Airbag sensor assy center malfunctionElectrical connection check mechanism
Airbag sensor assy center
INSPECTION PROCEDURE
1 CHECK AIRBAG SENSOR ASSY CENTER CONNECTOR
(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 the connection of the airbag sensor assy center connectors.
OK:
The connectors are connected.
HINT:
When the connectors are not firmly connected, disconnect them once and reconnect them securely.
2 CHECK AIR BAG SENSOR ASSY CENTER
(a) Connect the negative (-) terminal cable to the battery,
and wait at least for 2 seconds.
(b) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(c) Clear the DTCs stored in memory (see page 05-1215).
(d) Turn the ignition switch to the LOCK position.
(e) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(f) Check the DTCs (see page 05-1215).
OK:
DTC B1135/24 is not output.
HINT:
Codes other than code B1135/24 may be output at this time, but
they are not related to this check.
NG Go to step 3
OK
USE SIMULATION METHOD TO CHECK
05262-05