TOYOTA HIGHLANDER 2001 Service Repair Manual

H41715H44130H44536
Occupant
Classification ECU
FAirbag
Sensor
Assy
Center A
FSR-
FSR+ EDCB
A18
FSR-FSR+
A18
w/ Side and Curtain
Shield Airbagw/o Side and Curtain
Shield Airbag
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7 CHECK WIRE HARNESS (TO GROUND)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
w/ Side and curtain shield airbag:
Tester connectionConditionSpecified condition
A18-3 (FSR+) -
Body groundAlways1 MW or Higher
A18-10 (FSR-) -
Body groundAlways1 MW or Higher
w/o Side and curtain shield airbag:
Tester connectionConditionSpecified condition
A18-1 (FSR+) -
Body groundAlways1 MW or Higher
A18-2 (FSR-) -
Body groundAlways1 MW or Higher
NG Go to step 16
OK
8 RECHECK DTC
(a) Connect the connectors to the occupant classification ECU and the airbag sensor assy center.
(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 B1790 is not output.
HINT:
Codes other than code B1790 may be output at this time, but they are not related to this check.
NG Go to step 9
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-1207)

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9 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.
10 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
11 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)
12 RECHECK DTC
(a) Connect the connector to the occupant classification ECU.
(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 B1790 is not output.
HINT:
Codes other than code B1790 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
END

H03354H43116H03354H43116H43129
Occupant
Classification
ECUFront Seat
Wire RHFloor Wire
Airbag
Sensor
Assy
Center A
B C D E F
FSR-
FSR+
BL1
H03354H43116 H43129H44538
Occupant
Classification
ECUFront Seat
Wire RHFloor Wire
Airbag
Sensor
Assy
Center A
B C D E F
FSR-
FSR+
FSR+
FSR-
O6BL1
Service Wire
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13 CHECK FRONT SEAT WIRE RH (TO B+)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from battery,
and wait for at least 90 seconds.
(c) Disconnect the front seat wire RH connector from the floor
wire.
(d) Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
(e) Turn the ignition switch to the ON position.
(f) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
BL1-1 (FSR+) -
Body groundIgnition switch ONBelow 1 V
BL1-4 (FSR-) -
Body groundIgnition switch ONBelow 1 V
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
REPAIR OR REPLACE FLOOR WIRE
14 CHECK FRONT SEAT WIRE RH (OPEN)
(a) Disconnect the front seat wire RH connector from the floor
wire.
HINT:
Connector ºEº has already been inserted into the service wire.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
BL1-1 (FSR+) -
BL1-4 (FSR-)AlwaysBelow 1 W
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
REPAIR OR REPLACE FLOOR WIRE

H03354H43116H03354H43116H43129
Occupant
Classification
ECUFront Seat
Wire RHFloor Wire
Airbag
Sensor
Assy
Center A
B C D E F
FSR-
FSR+
BL1
H03354H43116H03354H43116H43129
Occupant
Classification
ECUFront Seat
Wire RHFloor Wire
Airbag
Sensor
Assy
Center A
B C D E F
FSR-
FSR+
BL1
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15 CHECK FRONT SEAT WIRE RH (SHORT)
(a) Disconnect the front seat wire RH connector from the floor
wire.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
BL1-1 (FSR+) -
BL1-4 (FSR-)Always1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
REPAIR OR REPLACE FLOOR WIRE
16 CHECK FRONT SEAT WIRE RH (TO GROUND)
(a) Disconnect the front seat wire RH connector from the floor
wire.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
BL1-1 (FSR+) -
Body groundAlways1 MW or Higher
BL1-4 (FSR-) -
Body groundAlways1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
REPAIR OR REPLACE FLOOR WIRE

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DTC B1793 OCCUPANT CLASSIFICATION SENSOR
POWER SUPPLY CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The occupant classification sensor power supply circuit consists of the occupant classification ECU and the
occupant classification sensors.
DTC B1793 is recorded when a malfunction is detected in the occupant classification sensor power supply
circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1793

When the occupant classification ECU receives a line
short signal, an open signal, short to ground signal or B+
short signal in the occupant classification sensor power
supply circuit for 2 seconds.

Open circuit in occupant classification sensors wire har-
ness

Occupant classification ECU malfunction

Seat adjuster frame assy (Occupant classification sensors)

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 B1793 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.
05IWZ-02

H43061
O11
Occupant Classification
Sensor Rear RHOccupant Classification ECU
1V
O76
SVC4
SVC2
SVC3
SVC1 O9
Occupant Classification
Sensor Front RH
1W
O712
O10
Occupant Classification
Sensor Rear LH
1O75
O8
Occupant Classification
Sensor Front LH
1R
O711 GR SVC4
SVC2
SVC3
SVC1
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WIRING DIAGRAM

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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

H43111
SVC1SVC2 SVC4 SVC3
O7
H43111
SVC1SVC2 SVC4 SVC3
O7
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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

H43111
SVC1SVC2 SVC4 SVC3
O7
H43111
SVC1SVC2 SVC4 SVC3
O7
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5 CHECK FRONT SEAT WIRE RH (OPEN)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
O7-5 (SVC3) -
O10-1 (SVC3)AlwaysBelow 1 W
O7-6 (SVC4) -
O11-1 (SVC4)AlwaysBelow 1 W
O7-1 1 (SVC1) -
O8-1 (SVC1)AlwaysBelow 1 W
O7-12 (SVC2) -
O9-1 (SVC2)AlwaysBelow 1 W
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
6 CHECK FRONT SEAT WIRE RH (SHORT)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
O7-5 (SVC3) -
O7-6 (SVC4)Always1 MW or Higher
O7-6 (SVC4) -
O7-1 1 (SVC1)Always1 MW or Higher
O7-1 1 (SVC1) -
O7-12 (SVC2)Always1 MW or Higher
O7-12 (SVC2) -
O7-5 (SVC3)Always1 MW or Higher
O7-12 (SVC2) -
O7-6 (SVC4)Always1 MW or Higher
O7-1 1 (SVC1) -
O7-5 (SVC3)Always1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK

- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
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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