2001 TOYOTA HIGHLANDER cruise control

010QL-02
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-25
25 Author
: Date
:
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
GENERAL INFORMATION
A large number of ECU controlled systems are used in the HIGHLANDER. In general, ECU controlled sys-
tems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoot. How-
ever, most problem checking procedures only involve inspecting the ECU controlled system's circuits one
by one. An adequate understanding of the system and a basic knowledge of electricity is enough to perform
effective troubleshooting, accurate diagnoses and necessary repairs. Detailed information and trouble-
shooting procedures on major ECU controlled systems in this vehicle are outlined below:
SystemSee Page
1. SFI System (2AZ-FE)05-1
2. SFI System (3MZ-FE)05-362
3. Tire Pressure Warning System05-729
4. ABS with EBD & BA & TRAC & VSC System05-761
5. Electronic Controlled Automatic Transaxle [ECT] (U241E/U140F)05-876
6. Electronic Controlled Automatic Transaxle [ECT] (U151E/U151F)05-986
7. Air Conditioning System05-1 114
8. Supplement Restraint System05-1 194
9. Lighting System05-1526
10. Audio System05-161 1
11. Rear Seat Entertaiment System05-1690
12. Navigation System05-1749
13. Combination Meter05-1868
14. Power Window Control System05-1901
15. Power Door Lock Control System05-1934
16. Wireless Door Lock Control System05-1960
17. Sliding Roof System05-1974
18. Engine Immobiliser System05-1985
19. Theft Deterrent System05-2012
20. Multiplex Communication System05-2040
21. CAN Communication System05-2090
22. Cruise Control System05-2136
FOR USING OBD II SCAN TOOL OR HAND-HELD TESTER

Before using the scan tool or tester, the scan tool's instruction book or tester's operator manual should
be read thoroughly.

If the scan tool or tester cannot communicate with the ECU controlled systems when you have con-
nected the cable of the tester to the DLC3 with the ignition switch and tester turned ON, there is a prob-
lem on the vehicle side or tester side.
(1) If communication is normal when the tester is connected to another vehicle, inspect the diagnosis
data link line (Bus
line) or ECU power circuit of the vehicle.
(2) If communication is still impossible when the tester is connected to another vehicle, the problem
is probably in the tester itself. So perform the Self Test procedures outlined in the Tester Opera-
tor 's Manual.

- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-29
29 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
The diagnostic system in the HIGHLANDER has various functions.
The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU
memory whenever a malfunction in the signal circuits to the ECU occurs. In a DTC check, a previous
malfunction's DTC can be checked by a technician during troubleshooting.
Another function is the Input Signal Check, which checks if the signals from various switches are sent
to the ECU correctly.
By using these functions, the problem areas can be narrowed down and troubleshooting is more effec-
tive. Diagnostic functions are incorporated in the following systems in the HIGHLANDER:
SystemDiagnostic Trouble
Code CheckInput Signal Check
(Sensor Check)Diagnotis Test Mode
(Active Test)
SFI System
(with Check Mode)
ABS with EBD & BA & TRAC & VSC System
Electronic Controlled Automatic Transaxle [ECT]
(with Check Mode)
Air Conditioning System
Supplement Restraint System
Power Window Control System
Power Door Lock Control System
Wireless Door Lock Control System
Engine Immobiliser System
Multiplex Communication System
Cruise Control System
In the DTC check, it is very important to determine whether the problem indicated by the DTC is: 1 still
occurring, or 2 occurred in the past but has since returned to normal. In addition, the DTC should be
compared to the problem symptom to see if they are related. For this reason, DTCs should be checked
before and after confirmation of symptoms (i.e., whether or not problem symptoms exist) to determine
current conditions, as shown in the table below.
Never skip the DTC check. Failure to check DTCs may, depending on the case, result in unnecessary
troubleshooting for systems operating normally or lead to repairs not pertinent to the problem. Follow
the procedures listed above in the correct order.
A flow chart showing how to proceed with troubleshooting using the DTC check is shown below. Direc-
tions from the flow chart will indicate should be performed DTC troubleshooting or to the troubleshoot-
ing of each problem symptom.
1 DTC CHECK
2 MAKE A NOTE OF DTCS DISPLAYED AND THEN CLEAR THE MEMORY
3 SYMPTOM CONFIRMATION
aSymptoms exist
bNo symptoms exist
a Go to step 5

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
1
234
2 HIGHLANDER(
Cont. next page)
Engine Control (
3M Z- FE)
Power Source
YB- WW
EFI
RelayD
W IC1 4
RW
G
LGIC3 6
R
W
WW
1
2
2 2
B- W
R
R
R R
A
B
6 7
L Y B W
CIRCUIT OPENING
Relay
R- W
B- WGY B
W- B
P- L
W- B L
W
BR
Y
W
K
P- L
G
R- WB- W
W
B
Y
LR R R R R 1
2
Y
G
W
W
WL- Y
QP ON MLJ C
IK3 13
A
Under the Left
HeadlightEH 52B 52G
32D 82B 42F5
3 1
2
Lef t Side of
Rear Cross MemberBCM 4
51 11 1
5 1
23 4E 1
61G
A/ F Rel ay2 2 2
2 1
3 5
R R R
5EB1
2
1 2
1 2
1 2
1 2
1 2
1 91G 41C 11G 11C
12I
20A
EFI NO. 1
2 GR
2
IC1 1
3
1
30A AM2
140A ALT
2W
10
Bat tery FL MAIN
3. 0W4M 4
7. 5A OBD
1E 10
1A 1BW
22B 72
2 1 2F B- W
B- W
G
2IC2
B
2A 7
W- BW- BP- L
14FB P
P
2B 4E W 2ACC
IG1
ST1
IG2
ST2 AM1 4
AM2
10A ETCS25A A/ F 15A IG2 10A IGN 10A EFI NO. 2
W40A AM1
1C 6
G10A HEATER1C 7
1K 13 G
73C
43A
BH P
Cruise Malfunction
Indicator Lamp11 A 4 B1A 13A
10 IL2 3B 12
3K 2I SB 9IL1
IB Right Instrument
Panel Brace
BR SB
PRL
P W
P
1 2
8IA2
W
B B B- W B- W
W
I15
F 7
I 8 I 9
I10
I11
I12
I13 C1 1(
A)
, C12(
B)
J 2
F12 Combination Meter
Fusible Link Block
Fuel Pump
Injector No. 1 Injector No. 2
Injector No. 3
Injector No. 4 Injector No. 5 Injector No. 6
Ignition SW
Junction
Connector

2005 HIGHLANDER (EWD592U)
M
1516
14 13
(
Cont. next page)
2 HIGHLANDER (
Cont' d)
(
Shielded)
(
Shielded)
(
Shielded) O
E ngine C ontrol (
3MZ- FE)
A
B
D
E
ED Rear Side of
Cylinder Head6D 7D 26 C 25 C C24 27 CIM1
A A
A
A
A
AA
A
A
L R R GL B- W
(
Shielded) (
Shielded) (
Shielded)VV2+ NE+ NE- VV1+ EKN2(
Shielded)
(
Shielded)
(
Shielded)
(
Shielded)
(
Shielded)BR
(
Shielded)
BR RR
7C
W- B W- B
W- B
W- BE03 E05 E04B
D O
R
BR
G
G C
(
Shielded)
D28D 1 20 D 2D1EA1 2 3 EA1 4EA1
KNK2 KNK1 EKNKEA1
W
B
G
R R GB W
C W- B
F
B
G A
5ATACH
18 ASIL
19 AWFSE
E
R V
R
B
15 A
EOM
W- B
A W
30 AENG-
25 ATRC+
31 ATRC-
17 ANE O
R Y GB
24 AENG+
V
Skid Control ECU
wit h Act uat or
<15- 5> FW
1 2
1 2
2 1
26 A 22 A 28 A 27 A 23 A 29 A
VCPA VPA EPA VCP2 VPA2 EPA2 EPA2 YPA2 VCP2 EPA VPA VCPA
231564
BRWL R
B G Elec tronic ally Cont rolled
Transmis sion and A/T
Indicator System< 13- 4>
D 10 B 17 B
YSPD 9IL2Y
CANCEL
- SET
+R E S
ON - OFF
LG
24 BCCS
Cruise Control (
3M Z- FE)
26 BIMO
V
27 BIMI
B Combination Meter
< 31- 4>
29 B 18 BMPX1 MPX2
Multiplex Communication
Sy st em (
BEAN Bus)
< 20- 3>
1 2
1 2
V
(
Shielded)
1E
E1
BR
A
A4
17 IM1 BRBR
5 4
OLG Cr uis e Cont rol SW
K 3
V 7
C 7
V 6
J 7
A27
K 2C1 6
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)Accel Position SensorCrankshaft
Pos ition Sens orCombinat ion SWEngine Contr ol ModuleJunct ion
Connect or
Knock Sens or
(
Ba nk 1)
Knock Sens or
(
Ba nk 2)
VVT Sens or LH VVT Sens or RH
Transponder Key Computer
<4- 3>

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
1920
18 17
2 HIGHLANDER (
Cont' d)
Cruise Control (
3M Z- FE)
4L A
A
Sk id Cont rol ECU with Ac tuator
<15- 6><15- 12>
W
B
W14
PPR
4L 6 12 4A 7
GF
B RSIL
11
OCA NL
6 CA NH
12TS
21 IL2GR
W- B
R C
D
SC BATTC 51613
4F 5
R W
OB
VV
B
B 15WFSE
E4G 1TAC
9
B
B
B
Sk i d Con t ro l ECU wi t h Ac t u at o r
<15- 6>
54I
4M 14G5
1E 3
1L 3
BR W
A
7 4N 14L
ICRight Cowl Side Panel
W- B
4H 5W- B
W- B
64C4CG
V O W
A
Occupant Classification ECU
<16- 12>
V BR
PCombination Meter
<31- 3>
Airbag Sensor
Assembly< 16- 9> V
Tr ansponder Key Comput er
<4- 3>
1E 12Body ECU
<18- 3> O W- B
J16D 3
Data Link Connect or 3
Junction
Connector

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
2
1112
10 9
(
Cont. next page)
3 HIGHLANDER (
Cont' d)
W
B- R
B- R A
B
C
21 D 29 D24 13
BRB
5D 23D A20 13 24
31 D
B- WBRY
GRB- R
YB
C
HT 1B OX1 B HA 1 A A1 A + A 1 A- TCW- B
R
O
E ngine C ontrol (
2AZ- FE)
(
Shielded)
(
Shielded)
W
A
IM1
R- Y
IM1 3G
O1 B- IM1 6R
2D
W
25 C C24 27 C
R GL Y
(
Shielded) (
Shielded)NE+ NE- G2+
G
26 B 27 BIMO IMI
V
B
NC- NC+ NT- NT +
Electronically Controlled
Tr ans mis sion and A/T Indicator
Sy st em< 14- 5>
D 34 D 26 D 35 D 275IM1
1 2
2 1A (
Shielded) (
Shielded)
(
Shielded)
28 D
EE Intake Side of
Cylinder Block7C 7D 5A1CIM14
A A
A
18 A
E1SI L
B
(
Shielded) BR
W
W- B W- BB
FKNK1 E03 E04 TACH MPX1MPX2(
Shielded)R
R
BRBR1 AA
VWFSEA 19
KNK1
D
R Y GB
24 AENG+
V
Skid Control ECU with Act uator
< 15- 5>B
-SET +RES ON- OFF
Cruise Contr ol SW
LG
2 5 24 BCCS NEO
A 17 TRC-
A 31 TRC+
A 25 ENG-
A 30B
26 A 22 A 28 A 27 A 23 A 29 A
VCPA VPA EPA VCP2 VPA2 EPA2 EPA2 VPA2 VCP2 EPA VPA VCPA
231564
BRWL R B G Sk i d Con t ro l ECU
with Actuator
<15- 6>
BV V
(
Shielded)
D O
V
E
15 A
W- BEOM
G
H W- BB
Cruise Control (
2AZ- FE)
29 B 18 B
Multiplex
C ommun i cat i on
System (
BEAN Bus)
<20- 3>
D
E
GELS2
A 12Voltage Inv ert er
< 27- 4>
W- B
GRGR
(
Shielded)
F
A
A
CA NCE L17 IM1 BR
BR
O
BR O
R
1
4
(
*1)
* 1 : w/ Rear Seat Entertainment System
H10A 6 C 7
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
K 1
C16 J16
A27 J 7
C 1
Air Fuel Ratio Sens or
(
Bank 1 Sens or 1)
Ac cel Pos ition Sens or
Ca ms ha f t
Position Sensor
Cr ank shaft
Position SensorCombination SW
Engine Contr ol Module
Heat ed Oxy gen Sens or
(
Bank 1 Sens or 2)
Junct ion
Connect or
Junc tion
Connec tor
Knoc k Sensor
(
Bank 1)
Trans ponder Key Computer
<4- 3>
HT OX
HT AF+ +B E
+B AF-

2005 HIGHLANDER (EWD592U)
M
4I 5A14
1516
14 13
3 HIGHLANDER (
Cont' d)
W
R
V
B A
C
E
G
Cruise Control (
2AZ- FE)
SC TC BAT
SIL CG
7 4 51316
4C 6 4L 11
4N 1 4F 54L7
ICRight Cowl Side PanelR O WP
W- B
W- B W- B
B GR O
Combination Meter
< 31- 3>V
15
WFSE DO
21 IL2
W- B
4G 1B
BW- B
B9 TAC
4A 12 6 4LCA NL
A A
BR P R
W
B
P 6
CA NH12
Occupant Classification
ECU< 16- 12>
Skid Control ECU
with Actuator
< 15- 6>
TSW
Skid Control ECU
wit h Actuat or
< 15- 6> < 15- 12>
W- B
H4H 5
W- B
4G 54M1V
Transponder Key
Computer < 4- 3>
31E
1E 12
Body ECU
< 18- 3> BR O
D DO
1L 3Airbag Sensor
Assembly< 16- 9> W
FR
BF BBRight Center Pillar A A 15 BJ1
W- B W- B
W- B W- BA
Near t he Rear
Si d e Mar ker
Light RH
J19
J16
D 3
J16
Data Link Connector 3
Junction
Connector
J unc tion
Connec torJunct ion
Connect or

2005 HIGHLANDER (EWD592U)
M
5
678
31 HIGHLANDER (
Cont' d)(
Cont. next page)
2IR2
5BH111 IR2
3K 23B 6
IBRight I nst rument
Panel Brace
OOPY
V
BR
10 IF2
8IC3
EARight Fr ont
Fender Apron A2 1
BR P Y- B
Y- B
W- B Engine Control
Sys tem< 2- 4> < 3- 4>
VSC and Tir e Pres sure
Warning System< 15- 9>
Combination Meter
A A14 BH1
D D
P23
O
O
13 A
B 7 A 17 11 B 10 B 4B 12 B 9A
VSC
ABS
Brake
Malfunction
Indicator Lamp
Washer Level CRUISE
Oil Pressure
Char ge
ECT SNOW
Fue l
L
2
D
N
R
P
Do or
Buzzer 3 O/ D OF F A/T
OIL TEMP
Air bag
Driver ' s
Seat BeltSlip MAINT REQDTi r e Ai r
Pressure
(
USA)(
US A)
E E P
9IL1PSB
A
W- B
B
P
W- B
TRAC OFF (
2WD)(
2WD)
* 1 : 3MZ- FE
(
*1)(
*1)
3B 1211 AR
F12J 3
W 1
J13
C11(
A)
, C12(
B)
J 6
Combinat ion Meter
Fuel SenderJunction
Connector
Junct ion
Connect or
Junct ion
Connect or Washer Level
Se nso r