o2 sensor TOYOTA HIGHLANDER 2001 Service Repair Manual

H45686
B9
Multiplex Network Body ECU
P5
Power Window
Regulator Master
Switch Assy
(Door ECU)
A17
Airbag Sensor
Assembly F7
FL Block
Assy2 1K
1A Y
1W-L
IB1IC3
810 1G
3 1D
2
2 L
9
CPUB
IB2 WD.C.C
5
IB2 V
BatteryMPX2
BDR10
GR
8
MPX2 2A
4F
5 BR
71
MPX27 V
SB
BR
Short
Connector
2W-B
IB1
W-B
4L
4L
W-B
IC GND
S30
222 Y5 IF3
IB2
7 1 61 2I
IL1ECU-B
4AO
8 8 BR Engine Room J/B
Passenger
Side J/B 4
FL Main W33
10 Instrument
Panel J/B
MPX1
Passenger
Side J/B BG
BR2 S31 FR
Door
ALT 05-2052
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

H45693
Power Window Regulator
Master Switch Assy (Door ECU)
Multiplex Network Body ECUAirbag Sensor
Assembly
A17
B9
P5
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2053
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK CONTINUITY OF COMMUNICATION LINE
(a) Check the wire harness between the multiplex network body ECU, power window regulator master
switch assy (door ECU) and airbag sensor assembly.

B51827
P5
05-2054
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
(1) Disconnect the connectors of the master switch, body ECU and air conditioner amplifier.
(2) Check the continuity between terminal P5-8 (MPX2) of the master switch vehicle's side connec-
tor and terminal B9-10 (MPX2) of the body ECU vehicle's side connector.
Standard: Continuity
(3) Check the continuity between terminal P5-7 (MPX1) of the master switch vehicle's side connec-
tor and terminal A17-22 (MPX2) of the airbag sensor assembly vehicle's side connector.
Standard: Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
2 CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSY
(a) Inspect the power window regulator master switch assy
(door ECU) (power source input).
(1) Disconnect the master switch connector.
(2) Check the voltage of each terminal of the master
switch vehicle's side connector.
Standard:
Symbols (Terminal No.)ConditionSpecified Condition
CPUB (P5-9) @ Body groundConstant10 - 14 V
BDR (P5-10) @ Body groundConstant10 - 14 V
NG REPAIR OR REPLACE FUSE OR WIRE
HARNESS AND CONNECTOR
OK

B60591
P6
Power Window Regulator
Motor Assy Front LHP5
Power Window Regulator
Master Switch Assy (Door ECU)
2 6
315
5
13 PLS
LMTW
OPLS
LMT
R E
SGND
- DIAGNOSTICSPOWER WINDOW CONTROL SYSTEM
05-1913
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DTC B1231/31 JAM PROTECTION LIMIT SWITCH CIRCUIT
ON DRIVER DOOR
DTC B1232/32 JAM PROTECTION PULSE SWITCH CIRCUIT
ON DRIVER DOOR
CIRCUIT DESCRIPTION
This DTC is output when the power window regulator motor assy malfunctions.
DTC No.DTC Detecting ConditionTrouble Area
B1231/31Open in power window regulator motor assy LH limit switch
system
Power window regulator motor assy LH

Wire harness
B1232/32Open or short in power window regulator motor assy LH
pulse sensor system
Power window regulator motor assy LH

Wire harness
WIRING DIAGRAM
0523H-03

B51843
Power Window Regulator
Master Switch Assy (Door ECU)
Power Window Regulator
Motor Assy LH
05-1914
- DIAGNOSTICSPOWER WINDOW CONTROL SYSTEM
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK WIRE HARNESS
(a) Disconnect the connectors of the power window regulator
master switch assy and power window regulator motor
assy LH.
(b) Check the continuity between the master switch and reg-
ulator motor.
Standard:
ItemSymbols (Terminal No.)
Master switch @ Regulator motorSpecified Condition
Limit switchLMT (5) @LMT (2)
SGND (13) @ E (3)Continuity
Pulse sensorPLS (15) @ PLS (6)
SGND (13) @ E (3)Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE POWER WINDOW REGULATOR MOTOR ASSY LH
(DRIVER SIDE)

I18376
A/C Amplifier assy
SG-3
TR A11A113
4 Y
W R6
Cooler (Room Temperature
Sensor)Thermistor1
2 05-1 130
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cabin and sends the appropriate signals to the A/C amplifier
assy.
DTC No.Detection itemTrouble Area
B1411/11Open or short in room temperature sensor circuit

Cooler (room temperature sensor) thermistor

Harness or connector between cooler (room temperature
sensor) thermistor and A/C amplifier assy

A/C amplifier assy
WIRING DIAGRAM
05ITS-01

I30331SG-3 (-) TR (+)
A/C Amplifier Connector
Wire Harness View:
A11
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
In case of using the hand-held tester, start the inspection step 1 and in case of not using the hand-held
tester, start from step 2.
1 READ VALUE OF HAND-HELD TESTER
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the items below in the DATA LIST,and read the displays on the hand-held tester.
A C:
ItemMeasurement Item/Display
(Range)Normal ConditionDiagnostic Note
ROOM TEMP
Room temperature sensor
/min.: -6.5C (20.3F)
max.: 57.25C (135.05F)
Actual room temperature-
Result:
NGA
OK (Checking from the DTC)B
OK (Checking from the PROBLEM SYMPTOM TABLE)C
B REPLACE AIRCONDITIONER AMPLIFIER ASSY
C PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE (SEE
PAGE 05-1 129)
A
2 INSPECT AIRCONDITIONER AMPLIFIER ASSY(TR, SG-3)
(a) Remove A/C amplifier assy with connectors still con-
nected.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
A11-3 (SG-3) -
A11-4 (TR)at 25C (77F)1.8 to 2.2 V
A11-3 (SG-3) -
A11-4 (TR)at 40C (104F)1.2 to 1.6 V
HINT:
As the temperature increases, the voltage decreases.
OK REPLACE AIRCONDITIONER AMPLIFIER ASSY
NG

I30111
Cooler Thermistor Connector
Front View:
R6
I38777I40673
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.0 0.5
020 40 Resistance
(kW)
Temperature 6810460 (
5C)
140 (
5F)
32Maximum permissible value line
Minimum permissible value line
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3 INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR
(a) Remove cooler (room temperature sensor) thermistor.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
R6-1 - R6-2105C (505F)3.00 to 3.73 kW
R6-1 - R6-2155C (595F)2.45 to 2.88 kW
R6-1 - R6-2205F (685F)1.95 to 2.30 kW
R6-1 - R6-2255C (775F)1.60 to 1.80 kW
R6-1 - R6-2305C (865F)1.28 to 1.47 kW
R6-1 - R6-2355C (955F)1.00 to 1.22 kW
R6-1 - R6-2405C (1045F)0.80 to 1.00 kW
R6-1 - R6-2455C (1135F)0.65 to 0.85 kW
R6-1 - R6-2505C (1225F)0.50 to 0.70 kW
R6-1 - R6-2555C (1315F)0.44 to 0.60 kW
R6-1 - R6-2605C (1405F)0.36 to 0.50 kW
NOTICE:

Even slightly touching the sensor may change the re-
sistance value. Be sure to hold the connector of the
sensor.

When measuring the sensor temperature must be the
same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases (see
the chart below).

I41011
R6
A11
Cooler (Room Temperature Sensor)
Thermistor Connector Front View:
A/C Amplifier Connector
Wire Harness View:
TRSG-3
- DIAGNOSTICSAIR CONDITIONING SYSTEM
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NG REPLACE COOLER (ROOM TEMP. SENSOR)
THERMISTOR
OK
4 CHECK HARNESS AND CONNECTOR(COOLER (ROOM TEMPERATURE SENSOR)
THERMISTOR - A/C AMPLIFIER ASSY)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A11-4 (TR) - R6-2AlwaysBelow 1 W
A11-3 (SG-3) - R6-1AlwaysBelow 1 W
A11-4 (TR) -
Body groundAlways10 kW or higher
A11-3 (SG-3) -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY

I38775
A/C Amplifier assy
TA M A1
Cooler (Ambient Temperature
Sensor) Thermistor
2 1
B-R BR
E2
E6E7 S29 S28
B 5
IK3 EB26Short Connector
BR A11
A109 2
MPX+
MPX-E6
E629 18
MPX1
MPX2
3228 5 5ECM
BR BEAN signal 05-1 134
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
The ECM and A/C amplifier communicate via BEAN.
This sensor detects the temperature outside the cabin and sends the appropriate signals to the A/C amplifier
assy.
DTC No.Detection itemTrouble Area
B1412/12Open or short in ambient temperature sensor circuit

Cooler (ambient temperature sensor) thermistor

Harness or connector between cooler (ambient temperature
sensor) thermistor and ECM

ECM

A/C amplifier assy
WIRING DIAGRAM
05ITT-01