2001 TOYOTA HIGHLANDER main ecu

2005 HIGHLANDER (EWD592U)
104
ECT and A/T Indicator for 3MZ-FE
BMPX-
A
1MPX1
W
2IF3R
SNOW MPX1
A 16
10
GR
ODMS9
MPX2
L
GR W- B
L
W- BW- BR
MPX2
V GR Y
E 4
29 BBR
R
8B
6
IB 13 3F6
83H3
4 A17
IF3 82B A IB2 8
IB2 1
IF3 5
15
O
7
8 MPX1
MPX2
A
P 5
MPX+
W
18 B
52
BR G
B
Y
SPD
17 B
IL2 9
Y
G
83D2 B 1
A 1A2
BR
24
MPX1
BR
22
MPX2
G V
4
11MPD1
MPD2
G 5
IL2 12
SB
74F 54AG
SB
Y IL2 1
SB
IF3 12
(
*1) (
*1)
G
(
*2)
G
Y
T16
S30(
A)
, S31(
B)
A10(
A)
, A11(
B)
B 9(
A)
, B10(
B)
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
A/C Control Assembly Airbag Sensor Assembly
Body ECU
Electronically Controlled
Transmission Pattern Select SW
Engine Control Module
Gateway ECU Power Window Master SW
with ECUShort Connector Transmission Control SW
Transmission Shift Main SW

2005 HIGHLANDER (EWD592U)
107
Previous automatic transaxle have selected each gear shift using mechanically controlled throttle hydraulic pressure,
governor hydraulic pressure and lock-up hydraulic pressure. The electronically controlled transmission, however, electrically
controls the line pressure, throttle pressure, lock-up pressure and accumulator pressure etc. through the solenoid valve. The
electronically controlled transmission is a system which precisely controls gear shift timing and lock-up timing in response to
the vehicle's driving conditions and the engine condition detected by various sensors. It makes smooth driving possible by
shift selection for each gear which is the most appropriate to the driving conditions at that time, and by preventing downing,
squat and gear shift shock when starting off.
1. Gear Shift Operation
During driving the engine warm up condition signal is input from engine coolant temp. sensor to TERMINAL THW of the
engine control module, and the vehicle speed signal is input from the ABS speed sensor to skid control ECU, and are sent to
the engine control module through communication control. At the same time, the throttle valve opening signal is sent from
the throttle position sensor to the TERMINALS VTA1 and VTA2 of the engine control module, as the throttle angle signal.
2. Lock-Up Operation
When the engine control module decides based on each signal that the lock-up condition has been met, the current flows
through TERMINAL DSL of the engine control module to TERMINAL 10 of the electronically controlled transmission solenoid
to GROUND.
3. Stop Light SW Circuit
If the brake pedal is depressed (Stop light SW on) when driving in lock-up condition, a signal is input to TERMINAL STP of
the engine control module. The engine control module operates and cuts the current to the solenoid to release lock-up.
4. Overdrive Circuit
*O/D main SW on
When the O/D main SW is turned on, a signal is input to TERMINAL ODMS of the engine control module and engine
control module operation causes gear shift when the conditions for overdrive are met.
*O/D main SW off
When the O/D main SW is turned off, a signal is input into TERMINAL ODMS of the engine control module, and turns on
the O/D off indicator light. This activates the ECU, and the transmission system is controlled not to shift to overdrive.
E4 Electronically Controlled Transmission Pattern Select SW
3-4 : Closed with the select SW at SNOW position
E5 (A), E6 (B), E7 (E), E8 (D), E9 (C) Engine Control Module
BATT-E1 : Always approx. 12 volts
MREL-E1 : Approx. 12 volts with the ignition SW ON position
P1 A/T Indicator SW
2-6 : Closed with the shift lever in P position
2-1 : Closed with the shift lever in R position
2-9 : Closed with the shift lever in N position
2-7 : Closed with the shift lever in D position
2-3 : Closed with the shift lever in 2 position
2-8 : Closed with the shift lever in L position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A10A42E5A42P544
A11B42E6B42S1543
A1742E7E42S2739 (3MZ-FE)
B9A42E8D42S28A43
B10B42E9C42S29B43
C638 (3MZ-FE)G543S30A43
C11A42J239 (3MZ-FE)S31B43
C12B42J643T339 (3MZ-FE)
E138 (3MZ-FE)J743T1339 (3MZ-FE)
E238 (3MZ-FE)J1743T1643
E442P139 (3MZ-FE)
System Outline
Service Hints

2005 HIGHLANDER (EWD592U)
11 5
Previous automatic transaxle have selected each gear shift using mechanically controlled throttle hydraulic pressure,
governor hydraulic pressure and lock-up hydraulic pressure. The electronically controlled transmission, however, electrically
controls the line pressure, throttle pressure, lock-up pressure and accumulator pressure etc. through the solenoid valve. The
electronically controlled transmission is a system which precisely controls gear shift timing and lock-up timing in response to
the vehicle's driving conditions and the engine condition detected by various sensors. It makes smooth driving possible by
shift selection for each gear which is the most appropriate to the driving conditions at that time, and by preventing downing,
squat and gear shift shock when starting off.
1. Gear Shift Operation
During driving the engine warm up condition signal is input from engine coolant temp. sensor to TERMINAL THW of the
engine control module, and the vehicle speed signal is input from the ABS speed sensor to skid control ECU, and are sent to
the engine control module through communication control. At the same time, the throttle valve opening signal is sent from
the throttle position sensor to the TERMINALS VTA1 and VTA2 of the engine control module, as the throttle angle signal.
2. Lock-Up Operation
When the engine control module decides based on each signal that the lock-up condition has been met, the current flows
through TERMINAL DSL of the engine control module to TERMINAL 3 of the electronically controlled transmission solenoid
to GROUND.
3. Stop Light SW Circuit
If the brake pedal is depressed (Stop light SW on) when driving in lock-up condition, a signal is input to TERMINAL STP of
the engine control module. The engine control module operates and cuts the current to the solenoid to release lock-up.
4. Overdrive Circuit
*O/D main SW on
When the O/D main SW is turned on, a signal is input to TERMINAL ODMS of the engine control module and engine
control module operation causes gear shift when the conditions for overdrive are met.
*O/D main SW off
When the O/D main SW is turned off, a signal is input into TERMINAL ODMS of the engine control module, and turns on
the O/D off indicator light. This activates the ECU, and the transmission system is controlled not to shift to overdrive.
E4 Electronically Controlled Transmission Pattern Select SW
3-4 : Closed with the select SW at SNOW position
E5 (A), E6 (B), E7 (E), E8 (D), E9 (C) Engine Control Module
BATT-E1 : Always approx. 12 volts
MREL-E1 : Approx. 12 volts with the ignition SW ON position
P1 A/T Indicator SW
2-6 : Closed with the shift lever in P position
2-1 : Closed with the shift lever in R position
2-9 : Closed with the shift lever in N position
2-7 : Closed with the shift lever in D position
2-3 : Closed with the shift lever in 2 position
2-8 : Closed with the shift lever in L position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A10A42E6B42S1543
A11B42E7E42S2741 (2AZ-FE)
A1742E8D42S28A43
B9A42E9C42S29B43
B10B42E1040 (2AZ-FE)S30A43
C640 (2AZ-FE)G543S31B43
C11A42J241 (2AZ-FE)T341 (2AZ-FE)
C12B42J643T1341 (2AZ-FE)
E240 (2AZ-FE)J743T1643
E442P141 (2AZ-FE)
E5A42P544
System Outline
Service Hints

2005 HIGHLANDER (EWD592U)
122
Headlight without Daytime Running Light
40A
MAIN
23 14
10A
H- LP
RH UPR10A
H- LP
LH UPR
2F 5 2F 2 2G1
2B1
15A H- LP
RH LWR
2 22
2 2 11
E 4
1 2
EA AA1 2IC3 7
IF3 7
16 B
A 191 2
1 2
H 3 H 1 H 4 H 2
IC2 17 IK310
4I 1
4N 24F 6
4A 13
I 3
IF3 9C 3
B 14IK3 4 L- R
R- Y
R- Y R- W
R
L- Y
RL-R B
R- W
R- WR- Y
G
Y
O
Y Y
W BRW- B
W- B
WYY Y HEAD LAMP
Relay
J 32
R- B
HRLY
HU
15A H- LP
LH LWR
From Power Source System (
See Page 62)
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D) C11(
A)
, C12(
B)
High
Beam
Body ECU Combination Meter
Headlight LH
(
High Beam) Headlight LH
(
Low Beam)
Headlight RH
(
High Beam) Headlight RH
(
Low Beam)
Junction
Connector

2005 HIGHLANDER (EWD592U)
142
Illumination
23 15
7. 5A PANEL
1J 4 1A 1
A 7
B 18
OFF
Tail
Head
Light
Control SW
IA3A 12 3A11
2 1
3A 7
L G
13J
21 15
3D 7
V Y
83G
1 2
3G 1
R W
TAI LL IGHT
Relay
SB B
TRL Y
TAI L
W
V140A ALT
2
1
F 7
Battery14
16
W- B
OA22
A10
C10
* 1 : 6 Speaker
* 2 : 8 Speaker FL MAI N
3. 0W13F
2 1
3E 8
L GR
M 2
3J 2
IR1 7
9 10
R26
A
A
BF
W- B
BB
W- B
B V W- B
C13A
J19
(
*4) (
*4)
* 3 : w/ Navigation System
* 4 : w/o Navigation System 1D 6
IL2 5101
W- R W L GR
6
B
GMD
R23
C16
(
*5) (
*5) (
*5) (
*5) (
*5)
* 5 : w/ Rear Heater System
* 6 : w/o Rear Heater System 1K 7
(
*2) (
*2)(
*2) B 9(
A)
, B10(
B)
A/C Control Assembly Ashtray Illumination Body ECU
Cigarette Lighter Illumination
Combination SW
Combination SWFusible Link Block
Junction
Connector
Main SW
Radio and Player
Rear Heater Blower SW

2005 HIGHLANDER (EWD592U)
146
Automatic Light Control
40A
MAIN
12
C13
Di mmer SWLight
Control SWFlashHighLow HeadTail OFF13 814
16 Auto
IAB 16 B 17 B 18 B 15 3
IK3 4
C 37. 5A
RAD
NO. 2
1J 6
A 21 A 20 A 12 52134 31
A 173C 63A 8
W B RL-R
G
W
R
7. 5A
IG1
1K 10
A 53B 53A 10
GR BR
7. 5A
ECU- B
2A 4
D 91H 61G 10
W- L G
C 11
1IC3 5
BR
A23
D 7
LG
P V OB B
W- BDRL NO. 2
Relay
HRLY ACC IG BECU CLTB CLTE CLTSCLTB CLTE CLTS
A HEAD TAIL HF DCTY2
3 3
3
R- B
2G 4
E10
R- B
R- B
A 7
TRLY
SB
1
1A 1
B
2
1
F 7 Battery
FL MAIN
3. 0W
W140A ALT
2I 1
W W
TAILLIGHT
Relay
51
32
1J 4
3
B
IA1 9From Power Source System (
See Page 62)
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D)Automatic Light Control Sensor
Body ECU
Combi nati on SW
Door Courtesy SW
Front LH
Fusible Link Block

2005 HIGHLANDER (EWD592U)
148
Light Auto Turn Off System
7. 5A
ECU- B
2A 47. 5A
IG1
1K 10
140A ALT
2
1
F 7 W
1A 115 231J 4
3
TAILLIGHT
Relay 40A MAIN
2I 12G 4
2
13 13 253
DRL NO. 2
Relay
3
B WR-BR-B
41 322B 1HEAD LAMP
Relay
L- R
SB L- R
(
*1)
R- B(
*1) (
*2)
A 7C3IK3 4
R SB
L- R
(
*1)
L- R
(
*2)
TRLY HRLYD 9
G
1H 61G 10IC3 5
BR W- L
BECUA 5
BR
3B 53A 10
GR
IG
B 2KSW
D D
1 2
4L 74G 9
4N 1
IC1C 11
Tail
Head14 13
16 OFFB 18 B17
IA C13
D 7 K 4 J 6
Battery FL MAI N
3. 0W
G G W- B W- B
W- B
BB
V
LG W- B W- B
DCTY TAI L HEAD
* 1 : w/ Dayti me Running Light
* 2 : w/o Daytime Running Light(
*2)
E10
(
*1) (
*1)
IA1 9From Power Source System (
See Page 62)
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D)
Body ECU
Combination SW
Door Courtesy SW
Front LH
Fusible Link Block
Junction
Connector
Unlock Warning
SW
Light
Control SW

2005 HIGHLANDER (EWD592U)
180
VSC and Tire Pressure Warning System
5
2 5
55IA1 IO2
MR 15 14
MRF1 2
IC2 6IC215
519 31
+BS RR+ RR-
1 2 FSW+
7
4J 3
4M 9
Y
R+ 45
B13
A25
28PKB
O
RL
1
S27
P 3ABS CUT RelayFL MAIN
3. 0W
Battery
WB
B- R
G- W
R- W B
GR
P Y
BRB B- OLG
B- R
2IO2
G- R
12 IA1
V RA24
RL- RL+6 2016 IC2 7IC22
1
Y- G
G
1 43CSW
41INIT
L- R
B- Y W W- B
W- B
IB
W- BT 6
4
121
P22
IC4 17 IC42
3J 44J6
ABS MTR Relay W- L
BM 25
1 89
50A ABS2 30A ABS1
5
5 5 51 51
32 32B- O
B
B
3F 13 4L74J 7
4N 1 4D 4 93G
IC
W- B
IL1 17 IC46
IF3 13
W
W- B
SB
P W- B
W- B W- B
IC4 11
LG
EH
W- B
1 GN D2
W- BF 7
(
*1) (
*1) (
*1) (
*1)
W- B 4C 3
W- B
ABS Speed Sensor Rear LH
ABS Speed Sensor Rear RH Br ake Pedal Load
Sensing SWFusible Link Block
Parking Brake SWPr essure SW
Skid Control ECU with Actuator
TRAC Off SW