Page 1329 of 2572

C81825
12345678
9 10111213141516
G25474G26206
DLC3:
CANH CGD3
C81825
12345678
9 10111213141516
G25474G26206
DLC3:
CANH CGD3
C81825
12345678
9 10111213141516
G25474G26206
DLC3:
CANH CGD3
05-2128
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
2318 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK CAN BUS LINE FOR SHORT TO GND(SKID CONTROL ECU, CAN-H)
(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
D3-4 (CG) -
D3-6 (CANH)Ignition SW OFF3 kW or more
OK REPLACE SKID CONTROL ECU WITH
ACTUATOR (SEE PAGE 32-37)
NG
4 CHECK CAN BUS LINE FOR SHORT TO GND(STEERING SENSOR, CAN-H)
(a) Reconnect the connector (S27) to the skid control ECU.
(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
D3-4 (CG) -
D3-6 (CANH)Ignition SW OFF3 kW or more
OK REPLACE STEERING SENSOR
(SEE PAGE 32-48)
NG
5 CHECK CAN BUS LINE FOR SHORT TO GND(YAW RATE SENSOR, CAN-H)
(a) Reconnect the connector (S14) to the steering sensor.
(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
D3-4 (CG) -
D3-6 (CANH)Ignition SW OFF3 kW or more
OK REPLACE YAW RATE SENSOR
(SEE PAGE 32-46)
NG
Page 1330 of 2572
G25476G26430
Junction Connector:
J16
CANH
CANL
E69126
Skid Control ECU
Connector Front
View:CANH
S27
GND1
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
05-2129
2319 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
6 CHECK CAN BUS LINE FOR SHORT TO GND(SKID CONTROL ECU - JUNCTION
CONNECTOR, CAN-H)
(a) Reconnect the connector (Y1) to the yaw rate sensor.
(b) Disconnect the wire harness connector (J16) from the
junction connector.
(c) Disconnect the connector (S27) from the skid control
ECU.
(d) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
S27-1 1 (CANH) -
S27-32 (GND1)Ignition SW OFF1 MW or more
NG REPAIR OR REPLACE CAN MAIN BUS LINE OR
CONNECTOR (SKID CONTROL ECU - JUNC-
TION CONNECTOR, CAN-H)
OK
Page 1331 of 2572
G24991G26210
S14
Steering Sensor Wire Harness View:
CANHESS
05-2130
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
2320 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 CHECK CAN BUS LINE FOR SHORT TO GND(STEERING SENSOR - JUNCTION
CONNECTOR, CAN-H)
(a) Disconnect the connector (S14) from the steering sensor.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
S14-2 (ESS) -
S14-10 (CANH)Ignition SW OFF1 MW or more
HINT:
Check the wire harness connector connected to the junction
connector while disconnecting it.
NG REPAIR OR REPLACE CAN MAIN BUS LINE OR
CONNECTOR (STEERING SENSOR - JUNC-
TION CONNECTOR, CAN-H)
OK
REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H)
Page 1332 of 2572
G30957
S14
Steering Sensor
CANL CANH
10
9CANL CANH J16
J/CSkid Control ECU
with Actuator
Y1
Yaw Rate Sensor
Passenger Side J/B D3
DLC3
Instrument Panel J/B
FL MAIN
BatteryF7
FL Block
ALT 1
2 CANL CANH
3
2
CANL CANH
6
14
CG
4
BAT
16Y
W10
21
B
WG
W 12
IO2
IO29
20
B
W
W-B
W22 11STRGVSC
VSC
STRG
YAW
YAW
DLC3
DLC3
4C 4N1 6
W-B
10
1E 1A1 OBD
B
IC 8
19L
W12
IC4
IC413B
W11
S27
S2725
13
W 05-2102
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
2292 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CHECK CAN BUS LINE
CIRCUIT DESCRIPTION
When any DTC for the CAN communication is output, first measure the resistance between the terminals
of DLC3 to specify the trouble area.
WIRING DIAGRAM
05DY5-04
Page 1333 of 2572

C81825
12345678
9 10111213141516
G25474G26206
DLC3:
CANH
CANLD3
C81825
12345678
9 10111213141516
G25474G26206
DLC3:
CANH
BATD3
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
05-2103
2293 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK CAN BUS LINE(MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR
SHORT CIRCUIT)
(a) Turn the ignition switch to the LOCK position.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified valueResult
D3-6 (CANH) -
D3-14 (CANL)Ignition SW OFF54 to 69 WOK
D3-6 (CANH) -
D3-14 (CANL)Ignition SW OFF69 W or moreNG-A
D3-6 (CANH) -
D3-14 (CANL)Ignition SW OFF54 W or lessNG-B
NG-A CHECK CAN MAIN BUS LINE FOR
DISCONNECTION (SEE PAGE 05-2109)
NG-B CHECK CAN BUS LINES FOR SHORT CIRCUIT
(SEE PAGE 05-21 12)
OK
2 CHECK CAN BUS LINE (CAN-H) FOR SHORT TO +B
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
D3-6 (CANH) -
D3-16 (BAT)Ignition SW OFF1 MW or more
NG CHECK CAN BUS LINE (CAN-H) FOR SHORT
TO +B (SEE PAGE 05-21 16)
OK
Page 1334 of 2572

C81825
12345678
9 10111213141516
G25474G26206
DLC3:
CANL
BATD3
C81825
12345678
9 10111213141516
G25474G26206
DLC3:CANH
CGD3
C81825
12345678
9 10111213141516
G25474G26206
DLC3:
CANL CGD3
05-2104
- DIAGNOSTICSCAN COMMUNICATION SYSTEM
2294 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK CAN BUS LINE (CAN-L) FOR SHORT TO +B
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
D3-14 (CANL) -
D3-16 (BAT)Ignition SW OFF1 MW or more
NG CHECK CAN BUS LINE (CAN-L) FOR SHORT TO
+B (SEE PAGE 05-2121)
OK
4 CHECK CAN BUS LINE (CAN-H) FOR SHORT TO GND
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
D3-4 (CG) -
D3-6 (CANH)Ignition SW OFF3 kW or more
NG CHECK CAN BUS LINE (CAN-H) FOR SHORT
TO GND (SEE PAGE 05-2126)
OK
5 CHECK CAN BUS LINE (CAN-L) FOR SHORT TO GND
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified value
D3-4 (CG) -
D3-14 (CANL)Ignition SW OFF3 kW or more
NG CHECK CAN BUS LINE (CAN-L) FOR SHORT TO
GND (SEE PAGE 05-2131)
OK
HOW TO PROCEED WITH TROUBLESHOOTING (SEE PAGE 05-2095)
Page 1335 of 2572
B80399
D.C.C
BatteryTheft Warning ECU Assy
+B1
E 29
13 5
3D 2A 4
3F
W-B 1W-B IC35
BR
FL Main 3Instrument Panel J/B Assy
Engine Room
J/B Assy
Center J/B
W ECU-B2A
2I1
SECURITY
5
IB+B2
W4
IC3IF1IL1 11
WL E
E J17
J/C
P
1G 1D
10
9P
2
L2
3 O
W-L
F7
FUSIBLE
LINK BLOCKT4 05-2026
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
2216 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
ECU POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
This circuit provides power to operate the theft deterrent (warning) ECU.
WIRING DIAGRAM
0522S-06
Page 1336 of 2572

B63408
Wire Harness Side
T4
Theft Warning ECU Assy
B63408
Wire Harness Side
T4
Theft Warning ECU Assy
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
05-2027
2217 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK THEFT WARNING ECU ASSY (ECU-B)
(a) Remove the ECU-B fuse from the engine room J/B.
(b) Measure the resistance.
Standard: Below 1 W
OK PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
NG
2 CHECK WIRE HARNESS (POWER SOURCE)
(a) Disconnect the T4 ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard:
Tester ConnectionSpecified Condition
T4-2 (+B1) - T4-29 (E)10 to 14 V
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3 CHECK THEFT WARNING ECU ASSY (GROUND)
(a) Disconnect the T5 ECU connector.
(b) Measure the resistance between the wire harness side
connector and body ground.
Standard:
Tester ConnectionSpecified Condition
T4-2 (+B1) - Body groundBelow 1 W
T4-29 (E) - Body groundBelow 1 W
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION