TOYOTA HIGHLANDER 2001 Service Repair Manual

05-1954
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
2144 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
ALL DOORS ARE NOT OPERATED BY THE DRIVER'S DOOR KEY
CYLINDER FOR INTERLOCKED WITH KEY
CIRCUIT DESCRIPTION
A lock or unlock signal via the manual switch (built in the master switch) and driver door key is transmitted
to the multiplex network body ECU multiply from the master switch (door ECU), and the multiplex network
body ECU drives the door lock motor of each door.
WIRING DIAGRAM
HINT:
Refer to See page 05-1944.
INSPECTION PROCEDURE
0526M-02

B51545
Unlock
Lock
OFF
B51546
Unlock
Lock
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
05-1955
2145 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
1 INSPECT FRONT DOOR LOCK ASSY LH
(a) Inspect the door lock assy continuity.
Standard:
Switch positionTester connectionSpecified condition
Lock2 @ 4Continuity
OFF-No continuity
Unlock2 @ 3Continuity
(b) Inspect the door lock motor operation.
Standard:
Measuring conditionOperation
Battery positive - Terminal 5
Battery negative - Terminal 6Lock
Battery positive - Terminal 6
Battery negative - Terminal 5Unlock
(c) Inspect the position switch continuity.
Standard:
Measuring conditionTester connectionSpecified condition
Battery positive -
Terminal 6
Battery negative -
Terminal 5
1 @ 2Continuity
NG REPLACE FRONT DOOR LOCK ASSY LH
OK

B51572
Power Window Regulator
Master Switch Assy (Door ECU)
Front Door Lock Assy LH
05-1956
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
2146 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 CHECK WIRE HARNESS
(a) Disconnect the master switch and door lock connector.
(b) Check the continuity between the master switch and door
lock.
Standard:
Terminals (Switch @ Door Lock)Specified condition
16 @ 1Continuity
4 @ 4Continuity
14 @ 3Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSY

F46778
ECM S27
Skid Control ECU
With Actuator
A1
A/C Ambient Temp.
SensorENG+
TA M
E2 IC4
IK3V
W-L
E524
Short Connector
S28 EB2ENG-
E5
E6
E7 R
B30
32 IC4
28 5
18
5 W-G
B-R ENG+
ENG-9
23
6
S29 55
BRBRBR
1 2
05-756
- DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
946 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
AMBIENT TEMPERATURE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
The ambient temperature sensor sends the outside temperature signal to the ECM. The ECM transmits the
signal to the skid control ECU as a communication signal. The skid control ECU controls the tire pressure
warning system, depending on the changes of the outside temperature.
HINT:
The signal sent from the ambient temperature sensor is also used in the A/C.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK DIAGNOSTIC CODE OUTPUT
(a) Check if the normal code is output by air conditioning system (see page 05-1 117).
OK:
DTC is not output.
NG REPAIR CIRCUIT INDICATED BY OUTPUT
CODE
OK
05IP2-01

F45165F45562F45563
Wire Harness Side:
Wire Harness Side:
ENG-ENG+ENG+
ENG- S27
E5
- DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
05-757
947 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 CHECK HARNESS AND CONNECTOR(BRAKE ACTUATOR ASSY - ECM)
(SEE PAGE 01-36)
(a) Disconnect the brake actuator assy S27 connector and
ECM E5 connector.
(b) Measure the resistance between each terminal of brake
actuator assy and ECM wire harness side connectors.
Standard:
Tester connectionSpecified condition
S27-9 (ENG+) - E5-24 (ENG+)Below 1 W
S27-23 (ENG-) - E5-30 (ENG-)Below 1 W
(c) Measure the resistance between each terminal of the
brake actuator assy wire harness side connector and
body ground.
Standard:
Tester connectionSpecified condition
S27-9 (ENG+) - Body ground10 kW or higher
S27-23 (ENG-) - Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK

A53769
ENG- ENG+
E5
E9
E1 ECM:
F45157
GND
1 V / Division
0.5 ms / Division
Normal Signal Waveform: ENG + terminal
F45158
1 V / Division
0.5 ms / Division
Normal Signal Waveform: ENG- terminal
GND
05-758
- DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
948 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT ECM(ENG+, ENG- OUTPUT)
(a) Connect the brake actuator assy S27 connector and ECM
E5 connector.
(b) Remove the ECM with the connectors connected.
(c) Turn the ignition switch to the ON position.
(d) Using an oscilloscope, connect the terminals, as shown
in the chart below.
Tester Connection
E5-24 (ENG+) - E9-1 (E1)
(e) With the engine idling, check the output waveform.
OK:
Signal waveform appears as shown in the illustration.
HINT:
As the vehicle speed increases, the waveform cycle narrows.
(f) Using an oscilloscope, connect the terminals, as shown
in the chart below.
Tester Connection
E5-30 (ENG-) - E9-1 (E1)
(g) With the engine idling, check the output waveform.
OK:
Signal waveform appears as shown in the illustration.
HINT:
As the engine speed increases, the waveform cycle narrows.
NG REPLACE ECM
OK

I30155
Ambient Temperature Sensor:
A1
I38777
Temperature (
C) 3.5
3.0
2.5
2.0
1.5
1.0
5.0
0.0
40 0
20 60 Resistance
(kW)4.0

C

F 104 68 140MIX
MAX
- DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
05-759
949 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
4 INSPECT AMBIENT TEMPERATURE SENSOR
(a) Remove the ambient temperature sensor and disconnect
the A1 connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A1-1 - A1-250
F (10
C)3.00 to 3.73 kW
A1-1 - A1-259
F (15
C)2.45 to 2.88 kW
A1-1 - A1-268
F (20
C)1.95 to 2.30 kW
A1-1 - A1-277
F (25
C)1.60 to 1.80 kW
A1-1 - A1-286
F (30
C)1.28 to 1.47 kW
A1-1 - A1-295
F (35
C)1.00 to 1.22 kW
A1-1 - A1-2104
F (40
C)0.80 to 1.00 kW
A1-1 - A1-211 3
F (45
C)0.65 to 0.85 kW
A1-1 - A1-2122
F (50
C)0.50 to 0.70 kW
A1-1 - A1-2131
F (55
C)0.44 to 0.60 kW
A1-1 - A1-2140
F (60
C)0.36 to 0.50 kW
HINT:
As the temperature increases, the resistance decreases (see
the chart below).
NOTICE:
Even slightly touching the sensor may change the resis-
tance value. Be sure to hold the connector of the sensor.
NG REPLACE AMBIENT TEMPERATURE SENSOR
OK

F46780
A1
Wire harness side:
E7
Wire harness side:
E2
TA ME6
05-760
- DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
950 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 CHECK HARNESS AND CONNECTOR(ECM - AMBIENT TEMPERATURE SENSOR)
(SEE PAGE 01-36)
(a) Disconnect the ECM E6 and E7 connectors.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
E6-32 (TAM) - A1-2AlwaysBelow 1 W
E7-28 (E2) - A1-1AlwaysBelow 1 W
E6-32 (TAM) - Body
groundAlways10 kW or higher
E7-28 (E2) - Body
groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ECM (SEE PAGE 10-9 OR 10-24)

I39166
C16
Steering Pad SW LH
AU1
AU2
EAU12
11
10GR
B
LIL13
R237
8
6SW1
SW2
GMD Radio Receiver Assy
R
LG
GRR23
R23 IL14
IL15 12
11
10 12
11
10AU1
AU2
EAUAU1
AU2
EAU A
Spiral Cable Sub-assy
- DIAGNOSTICSAUDIO SYSTEM
05-1643
1833 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
STEERING PAD SWITCH CIRCUIT
CIRCUIT DESCRIPTION
This circuit sends an operation signal from the steering pad switch to the radio receiver assy.
If there is an open in the circuit, the audio system cannot be operated by the steering pad switch.
If there is a short in the circuit, the same condition as that when the switch is continuously depressed occurs.
Therefore, the radio receiver assy cannot be operated by the steering pad switch, and also the radio receiver
assy itself does not function.
WIRING DIAGRAM
05IRM-01

I40203
R23
SW1
SW2GMD
05-1644
- DIAGNOSTICSAUDIO SYSTEM
1834 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 INSPECT RADIO RECEIVER ASSY
(a) Disconnect the connectors from the radio receiver assy.
(b) Measure the resistance according to the values in the
table below.
Standard:
Tester connectionConditionSpecified condition
SW1 - GMDDo not switch positionApprox. 100 kW
SW1 - GMDSEEK+ switch: pushApprox. 0 W
SW1 - GMDSEEK- switch: pushApprox. 0.3 kW
SW1 - GMDVOL+ switch: pushApprox. 1 kW
SW1 - GMDVOL- switch: pushApprox. 3.2 kW
SW2 - GMDDo not switch positionApprox. 100 kW
SW2 - GMDMODE switch: pushApprox. 0 W
NG Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

(SEE PAGE 05-1632)