TOYOTA HIGHLANDER 2001 Service Repair Manual
Page 1261 of 2572
B51841
S20
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2089
2279 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK SLIDING ROOF DRIVE GEAR SUB-ASSY
(a) Inspect the sliding roof drive gear sub-assy (sliding roof
ECU).
(1) Disconnect the sliding roof ECU connector.
(2) Inspect the voltage of each terminal of the vehicle's
side connector.
Standard:
Symbols (Terminal No.)ConditionSpecified Condition
E (S20-7) @ Body groundConstantContinuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSY
Page 1262 of 2572
I18376
A/C Amplifier assy
SG-3
TR A11A113
4 Y
W R6
Cooler (Room Temperature
Sensor)Thermistor1
2 05-1 130
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1320 Author: Date:
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
Page 1263 of 2572
I30331SG-3 (-) TR (+)
A/C Amplifier Connector
Wire Harness View:
A11
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 131
1321 Author: Date:
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
Page 1264 of 2572
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
05-1 132
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1322 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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).
Page 1265 of 2572
I41011
R6
A11
Cooler (Room Temperature Sensor)
Thermistor Connector Front View:
A/C Amplifier Connector
Wire Harness View:
TRSG-3
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 133
1323 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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
Page 1266 of 2572
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
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1324 Author: Date:
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
Page 1267 of 2572
I38774
TAM (+) E2 (-)
ECM Connector Wire Harness View:
E6E7
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 135
1325 Author: Date:
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
AMBI TEMP SENS
Ambient temperature sensor
/min.: -23.3C (-9.94F)
max.: 65.95C (150.71F)
Actual ambient temperature-
AMBI TEMP
adjusted ambient temperature
/min.: -30.8C (-23.44F)
max.: 50.8C (123.44F)
Actual ambient temperature-
Result:
NGA
OK (Checking from the DTC)B
OK (Checking from the PROBLEM SYMPTOM TABLE)C
B REPLACE ECM
C PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE(SEE
PAGE 05-1 129)
A
2 INSPECT ECM(TAM, E2)
(a) Remove ECM with connectors still connected.
(b) Turn ignition switch ON.
(c) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
E6-32 (TAM) -
E7-28 (E2)at 25C (77F)1.4 to 1.8 V
E6-32 (TAM) -
E7-28 (E2)at 40C (104F)0.8 to 1.2 V
HINT:
As the temperature increases, the voltage decreases.
OK REPLACE ECM
NG
Page 1268 of 2572
I30487
12A1 Ambient Temperature Sensor
Connector Front View:
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
05-1 136
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1326 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT COOLER (AMBIENT TEMP. SENSOR) THERMISTOR
(a) Remove cooler (ambient temperature sensor) thermistor.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A1-1 - A1-2105C (505F)3.00 to 3.73 kW
A1-1 - A1-2155C (595F)2.45 to 2.88 kW
A1-1 - A1-2205F (685F)1.95 to 2.30 kW
A1-1 - A1-2255C (775F)1.60 to 1.80 kW
A1-1 - A1-2305C (865F)1.28 to 1.47 kW
A1-1 - A1-2355C (955F)1.00 to 1.22 kW
A1-1 - A1-2405C (1045F)0.80 to 1.00 kW
A1-1 - A1-2455C (1135F)0.65 to 0.85 kW
A1-1 - A1-2505C (1225F)0.50 to 0.70 kW
A1-1 - A1-2555C (1315F)0.44 to 0.60 kW
A1-1 - A1-2605C (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).
Page 1269 of 2572
I41016
A1
E7
E6
1
2 Ambient Temperature Sensor
Connector Front View:
ECM Connector Wire Harness View:
ECM Connector Wire Harness View:
TA M E2
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 137
1327 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
NG REPLACE COOLER (AMBIENT TEMP. SENSOR)
THERMISTOR
OK
4 CHECK HARNESS AND CONNECTOR(COOLER (AMBIENT TEMPERATURE
SENSOR) THERMISTOR - ECM)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
E7-28 (E2) - A1-1AlwaysBelow 1 W
E6-32 (TAM) - A1-2AlwaysBelow 1 W
E7-28 (E2) -
Body groundAlways10 kW or higher
E6-32 (TAM) -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ECM
Page 1270 of 2572
I30339
A/C Amplifier Assy
TE
SG-1 A115
12 LG
LG-R E12
Cooler Thermistor No. 1
(Evaporator Temperature sensor)
1 2G-Y6
IJ1
P
A11
IJ13 05-1 138
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1328 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR
CIRCUIT
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cooling unit and sends the appropriate signals to the A/C
amplifier assy.
DTC No.Detection ItemTrouble Area
Cooler thermistor No. 1 (Evaporator temperature sensor)
B1413/13Open or short in evaporator temperature sensor circuit.
()
Harness or connector between cooler thermistor No. 1 and
A/C amplifier assyA/C amplifier assy.
A/C amplifier assy.
WIRING DIAGRAM
05ITU-01