2001 TOYOTA HIGHLANDER main ecu

H45686
B9
Multiplex Network Body ECU
P5
Power Window
Regulator Master
Switch Assy
(Door ECU)
A17
Airbag Sensor
Assembly F7
FL Block
Assy2 1K
1A Y
1W-L
IB1IC3
810 1G
3 1D
2
2 L
9
CPUB
IB2 WD.C.C
5
IB2 V
BatteryMPX2
BDR10
GR
8
MPX2 2A
4F
5 BR
71
MPX27 V
SB
BR
Short
Connector
2W-B
IB1
W-B
4L
4L
W-B
IC GND
S30
222 Y5 IF3
IB2
7 1 61 2I
IL1ECU-B
4AO
8 8 BR Engine Room J/B
Passenger
Side J/B 4
FL Main W33
10 Instrument
Panel J/B
MPX1
Passenger
Side J/B BG
BR2 S31 FR
Door
ALT 05-2052
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2242 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

B78729
Instrument Panel
J/B Assy
21 P5
Power Window Regulator
Master Switch Assy (Door ECU)
Engine
Room
J/BPassenger Side J/B
C11
Combination Meter Assy (Meter ECU)Air conditioner
Amplifier Assy
(A/C ECU) 7
5
1K 2IMPX1
IL2 V
IB2 8
SB
W-B Short
Connector
MPX-7
4
W-B MPX- BR
G
Y4F
4A
2
9 2A
1
IB F7
FL Block
AssyBR W-L
5
IC3
12
11
Battery13 3J
3E6 2
+BGND
123J
3F Center J/B 2
1
FL MAINS31
A11
A10
A10
G A1012
W
1 1G 10
1 3
WW
D.C.C.ECU-B
R
MPX+
Center
J/B
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2071
2261 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

H45692
T4
Theft Warning ECU Assy
(Theft Deterrent ECU)
A10
Air Conditioner
Amplifier Assy
(A/C ECU) F7
FL Block AssyEngine Room J/B
Combination
Meter 1 41D9
MPX1
21 1G10
BR
2A
2I SECURITYW-L3 IC3
BatteryJ17
J/C
1ECU-B
MPX- 3H V IF1
35
Y31
Center
J/B
3E 3J L
+B2
+B1
2 O
IL1112
W 4
L
P P
IC3 5
52A
D.C.C.
W
FL Main WMPX-C11
G53D
3F 11213
9W-B
IB 29
W-B EEE Instrument
Panel J/B 05-2076
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2266 Author
: Date
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

H45687
Combination Meter
(Meter ECU)S20
Sliding Roof Drive Gear Sub-assy
(Sliding Roof ECU)
E6
ECMIC IE12
8
2 1A
S/ROOF
SB W
1H
BB
IE1
8
IL2 1L
Y10
4D
4N
4L
W-BW-B
IA 5
1 Instrument
Panel J/B
1F7
FL Block Assy
FL MainEW-B
W-B
IE1 6
GR
GRGR
C12MPX2 929
MPX+1Passenger Side J/ B
67
4M
W-B
W-B Instrument
Panel J/B
Assy41E
1D 14
Battery7
1
MPX1 05-2086
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2276 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

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

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
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: Date
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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

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

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)