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
Page 1311 of 2572

C81825
12345678
9 10111213141516
G25474G26206
DLC3:
CANH
CANLD3
05-21 10
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
2300 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK DLC3
(a) Turn the ignition switch to the LOCK position.
(b) Measure the resistance according to the value(s) in the
table below.
Result:
Tester connectionConditionSpecified valueResult
D3-6 (CANH) -
D3-14 (CANL)Ignition SW OFF108 to 132 WA
D3-6 (CANH) -
D3-14 (CANL)Ignition SW OFF132 W or moreB
NOTICE:
When the measured value is 132 W or more and the CAN
communication system diagnostic code is output, there
may be a fault besides disconnection of the DLC3 sub bus
line. For that reason, troubleshooting should be performed
again from ºHow to proceed with troubleshootingº after re-
pairing the trouble area.
B REPAIR OR REPLACE DLC3 SUB BUS LINE OR
CONNECTOR (CAN-H, CAN-L)
A
2 READ OUTPUT DTC
(a) Read the output diagnostic codes.
Standard:
U0073/94, U0123/62, U0124/95 and U0126/63 are output simultaneously.A
Only U0126/63 is output.B
NOTICE:
Diagnostic codes other than the CAN communication system diagnostic codes (U0073/94, U0123/62,
U0124/95, U0126/63) may be output simultaneously with the CAN codes.
B Go to step 4
A
Page 1312 of 2572

E69126
Skid Control ECU Connector
Front View:
CANH
CANL
S27
G24991G26210
Steering Sensor Wire Harness View:
S14
CANH
CANL
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
05-21 11
2301 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK CAN MAIN BUS LINE FOR DISCONNECTION(SKID CONTROL ECU -
JUNCTION CONNECTOR)
(a) Disconnect the connector (S27) from the skid control
ECU.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
S27-1 1 (CANH) -
S27-25 (CANL)Ignition SW OFF108 to 132 W
NG REPAIR OR REPLACE CAN MAIN BUS LINE OR
CONNECTOR (SKID CONTROL ECU - JUNC-
TION CONNECTOR)
OK
REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE PAGE 32-37)
4 CHECK CAN MAIN BUS LINE FOR DISCONNECTION(STEERING SENSOR -
JUNCTION CONNECTOR)
(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
S14-10 (CANH) -
S14-9 (CANL)Ignition SW OFF108 to 132 W
NG REPAIR OR REPLACE CAN MAIN BUS LINE OR
CONNECTOR (STEERING SENSOR - JUNC-
TION CONNECTOR)
OK
REPLACE STEERING SENSOR (SEE PAGE 32-48)