TOYOTA HIGHLANDER 2001 Service Repair Manual

B51837
A10
05-2074
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2264 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK AIRCONDITIONER AMPLIFIER ASSY
(a) Inspect the air conditioner amplifier assy (A/C ECU) (body ground).
(1) Disconnect the air conditioner amplifier connector A10.
(2) Inspect the continuity between terminal A10-11 (GND) of the vehicle's side connector and the
body ground.
Standard: Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY

- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2075
2265 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1269/69 THEFT DETERRENT ECU COMMUNICATION
STOP
CIRCUIT DESCRIPTION
B1269/69 will be output when the communication between the theft warning ECU assy (theft deterrent ECU)
and multiplex network body ECU stops for more than 10 seconds.
DTC No.DTC Detecting ConditionTrouble Area
B1269/69No communication from theft deterrent ECU for more than 10 seconds
Theft warning ECU assy (theft deterrent ECU)

Wire harness
05241-06

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
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2266 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

H45691
Theft Warning ECU Assy
(Theft Deterrent ECU)
Air Conditioner
Amplifier Assy
(A/C ECU)
Combination MeterA10
C11 T4
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2077
2267 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK CONTINUITY OF COMMUNICATION LINE
(a) Check the wire harness between the combination meter, theft warning ECU assy (theft deterrent ECU)
and airconditioner amplifier assy (A/C ECU).

B50657
4T4
05-2078
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2268 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
(1) Disconnect the connectors of the theft warning ECU, master switch and air conditioner amplifier.
(2) Check the continuity between terminal T4-31 (MPX1) of the theft warning ECU vehicle's side
connector and terminal C11-21 (MPX-) of the master switch vehicle's side connector.
(3) Check the continuity between terminal T4-31 (MPX1) of the theft warning ECU vehicle's side
connector and terminal A10-9 (MPX-) of the air conditioner amplifier vehicle's side connector.
Standard: Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
2 CHECK THEFT WARNING ECU ASSY
(a) Inspect the theft warning ECU assy (theft deterrent ECU) (power source input).
(1) Disconnect the theft warning ECU connector.
(2) Check the voltage between terminal T4-2 (+B1) and T4-8 (+B2) of the theft warning ECU and
the body ground.
Standard: 10 - 14 V
NG REPAIR OR REPLACE FUSE OR WIRE
HARNESS AND CONNECTOR
OK

B50657
T4
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2079
2269 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK THEFT WARNING ECU ASSY
(a) Inspect the theft warning ECU assy (theft deterrent ECU) (body ground).
(1) Disconnect the theft warning ECU connector.
(2) Check the continuity between terminal T4-29 (E) of the theft warning ECU vehicle's side connec-
tor and the body ground.
Standard: Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE THEFT WARNING ECU ASSY

- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2085
2275 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1273/73 SLIDING ROOF ECU COMMUNICATION
STOP
CIRCUIT DESCRIPTION
B1273/73 will be output when the communication between the sliding roof drive gear sub-assy (sliding roof
ECU) and the MPX body ECU stops for more than 10 seconds.
DTC No.DTC Detecting ConditionTrouble Area
B1273/73No communication from sliding roof ECU for more than 10 seconds
Sliding roof drive gear sub-assy (sliding roof ECU)

Wire harness
05243-03

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

H45690
E6
C12 Combination Meter Assy (Meter ECU)
Sliding Roof Drive Gear Sub-Assy
(Sliding Roof ECU)ECM
S20
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2087
2277 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK CONTINUITY OF COMMUNICATION LINE
(a) Inspect the wire harness between the ECM, sliding roof drive gear sub-assy (sliding roof ECU) and
combination meter assy (meter ECU).

B51840
S20
05-2088
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2278 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
(1) Disconnect the connectors of the sliding roof ECU, ECM and meter assy.
(2) Inspect the continuity between terminal S20-10 (MPX1) of the sliding roof ECU vehicle's side
connector and terminal E6-29 (MPX2) of the ECM vehicle's side connector.
Standard:
Symbols (Terminal No.)Specified Condition
MPX1 (S20-10) @ MPX2 (E6-29)
(equipped with 1MZ-FE)Continuity
MPX1 (S20-10) @ MPX2 (E6-29)
(equipped with 2AZ-FE)Continuity
(3) Inspect the continuity between terminal S20-10 (MPX1) of the sliding roof ECU vehicle's side
connector and terminal C12-9 (MPX+) of the meter assy vehicle's side connector.
Standard: Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
2 CHECK SLIDING ROOF DRIVE GEAR SUB-ASSY
(a) Inspect the sliding roof drive gear sub-assy (sliding roof
ECU).
(1) Disconnect the sliding roof ECU connector.
(2) Inspect the voltage of each terminal of the vehicle's
side connector.
Standard:
Symbols (Terminal No.)ConditionSpecified Condition
B (S20-1) @ Body groundConstant10 - 14 V
NG REPAIR OR REPLACE FUSE OR WIRE
HARNESS AND CONNECTOR
OK