TOYOTA HIGHLANDER 2001 Service Repair Manual
Page 1301 of 2572
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 169
1359 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK MULTIPLEX COMMUNICATION SYSTEM
NG GO TO MULTIPLEX COMMUNICATION SYSTEM
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY
Page 1302 of 2572
B51271
9
BG3
4
BG2Y
LGLOCK
UNLOCK
B14
Back Door Key Lock
and Unlock Switch
IA214
4 V
B
J14
J/C17
1
T4L Theft Warning ECU Assy
IL2
8
IL2UL 33T415
IA2
BRSB
BR
Y 2
3
BE W-B
A
I07296
LOCK
UNLOCK
05-2036
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
2226 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
BACK DOOR KEY LOCK AND UNLOCK SWITCH CIRCUIT
CIRCUIT DESCRIPTION
The back door key lock and unlock switch comes on when the back door key cylinder is turned to the unlock
side with the key.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK BACK DOOR KEY LOCK AND UNLOCK SWITCH
(a) Remove the switch.
(b) Measure the resistance.
Standard:
Tester ConnectionConditionSpecified Condition
1-2Turned to lock sideBelow 1 W
1-2, 1-3Not turned10 kW or higher
1-3Turned to unlock sideBelow 1 W
NG REPLACE BACK DOOR KEY LOCK AND
UNLOCK SWITCH
OK
05ITO-02
Page 1303 of 2572
B77251
Wire Harness Side
B14
Back Door Key
Lock and Unlock Switch
T4
Theft Warning ECU Assy
B31046
Wire Harness Side
B14
Back Door Key Lock and Unlock Switch
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
05-2037
2227 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 CHECK WIRE HARNESS
(THEFT WARNING ECU ASSY - BACK DOOR KEY LOCK AND UNLOCK SWITCH)
(a) Disconnect the T4 ECU connector.
(b) Disconnect the B14 switch connector.
(c) Measure the resistance between the wire harness side
connectors.
Standard:
Tester ConnectionSpecified Condition
B14-2 (LOCK) - T4-15 (L)Below 1 W
B14-8 (UNLOCK) - T4-33 (UL)Below 1 W
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3 CHECK BACK DOOR KEY LOCK AND UNLOCK SWITCH (BODY GROUND)
(a) Disconnect the B14 switch connector.
(b) Measure the resistance between the wire harness side
connector and body ground.
Standard:
Tester ConnectionSpecified Condition
B14-1 - Body groundBelow 1 W
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE THEFT WARNING ECU ASSY
Page 1304 of 2572
05ESL-05
05-10
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
200 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
BASIC INSPECTION
When the malfunction is not confirmed in the DTC check, troubleshooting should be carried out in all the
possible circuits considered as possible causes of the problem. In many cases, by carrying out the basic
engine check shown in the following flowchart, the problem can be found quickly and efficiently. Therefore,
using this check is essential in the engine troubleshooting.
1 CHECK BATTERY VOLTAGE
NOTICE:
Carry out the battery voltage check with the engine stopped and ignition switch OFF.
OKNG
Voltage11 V or moreLess than 11 V
NG CHARGE OR REPLACE BATTERY
OK
2 CHECK IF ENGINE WILL CRANK
NG PROCEED TO PROBLEM SYMPTOMS TABLE
ON PAGE 05-31
OK
3 CHECK IF ENGINE STARTS
NG Go to step 7
OK
4 CHECK AIR FILTER
Visually check if the air filter is contaminated with dirty or oily.
NG CLEAN OR REPLACE
OK
5 CHECK IDLE SPEED (See page 14-1)
NG PROCEED TO PROBLEM SYMPTOMS TABLE
ON PAGE 05-31
OK
6 CHECK FUEL PRESSURE (See page 11-4)
NG PROCEED TO PAGE 11-4 AND CONTINUE TO
TROUBLESHOOT
OK
Page 1305 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 1
201 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 CHECK FOR SPARK (See page 18-3)
NG PROCEED TO PAGE 18-1 AND CONTINUE TO
TROUBLESHOOT
OK
PROCEED TO PROBLEM SYMPTOMS TABLE ON PAGE 05-31
Page 1306 of 2572
G30958
4L 4J
4C 4C
W-B
Battery FL MAINPassenger Side J/BS14
Steering Sensor
IG1
ESS 4
711
3
2 1CANH
CANL
9 10
W-BL STRG
STRG J16
J/C
10
21
Y
F7 FL Block
ALTInstrument Panel J/B
1A1D
1C1C 10
17
6 ECU-IG
AM1
12G
W4
IC WY
12 WB2 I15
Ignition SW
IG1 AM1
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
05-2105
2295 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
STEERING SENSOR COMMUNICATION STOP MODE
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
U0126/63
When ECU terminal IG1 voltage is 9.5 V or more, data is
not received from the steering sensor for more than 1 sec.
When ECU terminal IG1 voltage is 9.5 V or more, data
can not be received from the steering sensor more than
once within 5 sec. This situation repeatedly occurs more
than 10 times.
Steering sensor
Power source of steering sensor
WIRING DIAGRAM
05IR2-02
Page 1307 of 2572
G24991G26210
Steering Sensor Wire Harness View:
ESS
IG1 S14
05-2106
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
2296 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK WIRE HARNESS(IG1, ESS)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the connector (S14) from the steering sensor.
(c) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
S14-2 (ESS) -
Body groundAlwaysBelow 1 W
(d) Connect the connector (S14) to the steering sensor.
(e) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified value
S14-1 (IG1) -
Body groundIgnition SW ON10 to 14 V
NOTICE:
Perform the measurement from the back of the connector
with the connector connected.
NG REPAIR OR REPLACE WIRE HARNESS OR
CONNECTOR
OK
REPLACE STEERING SENSOR (SEE PAGE 32-48)
Page 1308 of 2572
G30959
4J4C
Battery FL MAINPassenger Side J/BY1
Yaw Rate Sensor
IG
GND 42
5CANH
CANL
2 3 YAW
YAW J16
J/C
9
20
Y
F7 FL Block
ALTInstrument Panel J/B
1A 1D
1C 1C 10
17
6 ECU-IG
AM1
12G
W4
BF WG
12 WB2 I15
Ignition SW
IG1 AM1WB
IO2
IO212
13
O
AA W-B W-BJ19
J/C
1 3
IO2 V
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
05-2107
2297 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
YAW RATE SENSOR COMMUNICATION STOP MODE
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
U0123/62
When ECU terminal IG1 voltage is 9.5 V or more, data is
not received from the yaw rate sensor for more than 1
sec.
When ECU terminal IG1 voltage is 9.5 V or more, data
can not be received from the yaw rate sensor more than
once within 5 sec .This situation repeatedly occurs more
than 10 times.
Yaw rate sensor
Yaw rate sensor sub bus line
Power source of yaw rate sensor
U0124/95
When ECU terminal IG1 voltage is 9.5 V or more, data is
not received from the deceleration the sensor for more
than 1 sec.
When ECU terminal IG1 voltage is 9.5 V or more, data
can not be received from the deceleration sensor more
than once within 5 sec. This situation repeatedly occurs
more than 10 times.
Yaw rate sensor
Yaw rate sensor sub bus line
Power source of yaw rate sensor
WIRING DIAGRAM
05DY8-04
Page 1309 of 2572
G26359
Yaw Rate Sensor Connector
Front View:
CANLCANH
Y1
G26359
Yaw Rate Sensor Connector
Front View:
IG
GND
Y1
05-2108
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
2298 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK CAN BUS LINE FOR DISCONNECTION(YAW RATE SENSOR SUB BUS
LINE)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the connector (Y1) from the yaw rate sensor.
(c) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
Y1-2 (CANL) -
Y1-3 (CANH)Ignition SW OFF54 to 69 W
NG REPAIR OR REPLACE YAW RATE SENSOR SUB
BUS LINE OR CONNECTOR (CAN-H, CAN-L)
OK
2 CHECK WIRE HARNESS(IG,GND)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
Y1-1 (GND) -
Body groundAlwaysBelow 1 W
(b) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified value
Y1-5 (IG) - Body groundIgnition SW ON10 to 14 V
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE YAW RATE SENSOR (SEE PAGE 32-46)
Page 1310 of 2572
G30960
S14
Steering Sensor
CANL CANH
10
9CANL CANH J16
J/CSkid Control ECU
with Actuator
Y
W10
21STRGVSC
VSC
STRG8
19L
W12
IC4
IC413B
W11
S27
S2725
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
05-2109
2299 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CHECK CAN MAIN BUS LINE FOR DISCONNECTION
CIRCUIT DESCRIPTION
The CAN main bus line and DLC3 sub bus line may have a disconnection when the resistance between ter-
minals 6 (CANH) and 14 (CANL) of the DLC3 is more than 69 W.
SymptomTrouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of
DLC3 is more than 69 W .CAN main bus line
Skid control ECU
Steering sensor
WIRING DIAGRAM
05DY7-1 1