TOYOTA AVENSIS 2005 Service Repair Manual

B68155
Wire Harness Side
C10
Combination Meter Assy
(Combination Meter ECU) T6
Theft Warning ECU Assy
B65849
Wire Harness Side
T6
Theft Warning ECU Assy
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05±1691
AVENSIS REPAIR MANUAL (RM1018E)
1 CHECK RESISTANCE OF COMMUNICATION LINE
(a) Disconnect the T6 and C10 ECU connectors.
(b) Check the resistance between wire harness side connec-
tors.
Standard:
Tester ConnectionSpecified Condition
T6±31 (MPX) ±
C10±15 (BEAN) (Security)Below 1

NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
2 CHECK THEFT WARNING ECU ASSY
(POWER SOURCE)
(a) Disconnect the T6 ECU connector.
(b) Check the voltage between the wire harness side con-
nector and the body ground.
Standard:
Tester ConnectionSpecified Condition
T6±2 (+B1) ± Body ground10 to 14 V
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK

B65849
Wire Harness Side
T6
Theft Warning ECU Assy
05±1692
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
3 CHECK THEFT WARNING ECU ASSY (GROUND)
(a) Disconnect the T6 ECU connector.
(b) Check the resistance between the wire harness side con-
nector and the body ground.
Standard:
Tester ConnectionSpecified Condition
T6±29 (E) ± Body groundBelow 1

NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE THEFT WARNING ECU ASSY

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05±1685
AVENSIS REPAIR MANUAL (RM1018E)
DTC B1262 A/C ECU COMMUNICATION STOP
CIRCUIT DESCRIPTION
DTC B1262 will be output when the communication between the A/C ECU and the integration relay stops
for more than 10 seconds.
DTC No.DTC Detection ConditionTrouble Area
B1262No communication from A/C ECU for more than 10 se-
conds
A/C control assy (A/C ECU)

Wire harness
05C5S±01

B67808
Battery 120
J17
J/C+BMPX±
A1110
ECU±B 2
34IC1
CG DCCA15
P±B
IE4
3A13 I14
W±R
IK6CF7
B±W2
2
Main6 1Instrument Panel J/B Assy
(Integration Relay)
P
1A10A/C Control Assy
(A/C ECU)
A13
29
P
MPX1
MPX+ 10
A159
E10 29
29 21
E9
E9 MPX2
A132 24
A16 CC
6
1
3B*
5
B*5
GND
A13 40 13
A16 W±B*7
W±B*6
CA
IP*
1: Except Automatic A/C
*2: Automatic A/C
*
3: 1AZ±FSE
*
4: 1AZ±FE, 1ZZ±FE, 3ZZ±FE
*5: 1CD±FTV
*
6: LHD
*7: RHD ECM*
2
*1
*1
*2 *3
*4 *5
*1
*2
*2 *1
Center J/B
W±R Fuse Block Assy
B±W
Engine Room R/B No. 3*5
Engine Room R/B
Center J/B
*3,
4
B±GEngine Room J/B No. 4*3,
4
B±G*3,
4
4B 4A
1
1 5
IP1
1
A
W±B*
7
W±B*6
*6*7
J15
J/C A 05±1686
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM

B68152
Wire Harness Side
A13
*1
Air Conditioning Control Assy
A15
*2
Air Conditioning Control Assy
I14
Instrument Panel J/B Assy
(Integration Relay)
E10
*3
ECM
E9
*4,
5
ECM
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05±1687
AVENSIS REPAIR MANUAL (RM1018E)
1 CHECK RESISTANCE OF COMMUNICATION LINE
(a) Disconnect the A13 or A15, E10 or E9 and I14 connec-
tors.
(b) Check the resistance between wire harness side connec-
tors.
Standard:
1AZ±FSE
Tester ConnectionSpecified Condition
*1
A13±29 (MPX±) ± I14±11 (MPX1)
*2
A15±20 (MPX±) ± I14±11 (MPX1)Below 1
*1
A13±9 (MPX+) ± E10±29 (MPX2)Below 1

*2
A15±10 (MPX+) ± E10±29 (MPX2)
1AZ±FE, 1ZZ±FE, 3ZZ±FE
Tester ConnectionSpecified Condition
*1
MPX± (A13±29) ± MPX1 (I14±11)
*2
MPX± (A15±20) ± MPX1 (I14±11)Below 1
*1
MPX+ (A13±9) ± MPX2 (E9±29)Below 1

*2
MPX+ (A15±10) ± MPX2 (E9±29)
1CD±FTV
Tester ConnectionSpecified Condition
*1
MPX± (A13±29) ± MPX1 (I14±11)
*2
MPX± (A15±20) ± MPX1 (I14±11)Below 1
*1
MPX+ (A13±9) ± MPX2 (E9±21)Below 1

*2
MPX+ (A15±10) ± MPX2 (E9±21)
HINT:
*
1: Except automatic A/C
*
2: Automatic A/C
*
3: 1AZ±FSE
*
4: 1AZ±FE, 1ZZ±FE, 3ZZ±FE
*
5: 1CD±FTV
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK

B68404
Wire Harness Side
A16
*2
A/C Control Assy A13
*1
A/C Control Assy
B68404
Wire Harness Side
A16
*2
A/C Control Assy A13
*1
A/C Control Assy
05±1688
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
2 CHECK AIR CONDITIONING CONTROL ASSY (A/C ECU)
(POWER SOURCE)
(a) Disconnect the A13 or A16 ECU connector.
(b) Check the voltage between the wire harness side con-
nectors and the body ground.
Standard:
Tester ConnectionSpecified Condition
*1
A13±2 (+B) ± Body ground10 to 14 V*2
A16±24 (+B) ± Body ground10 to 14 V
*1: Except Automatic A/C
*
2: Automatic A/C
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3 CHECK AIR CONDITIONING CONTROL ASSY (A/C ECU)
(GROUND)
(a) Disconnect the A13 or A16 ECU connector.
(b) Check the voltage between the wire harness side con-
nectors and the body ground.
Standard:
Tester ConnectionSpecified Condition
*1
A13±40 (GND) ± Body ground10 to 14 V*2
A16±3 (GND) ± Body ground10 to 14 V
*1: Except Automatic A/C
*
2: Automatic A/C
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE AIR CONDITIONING CONTROL ASSY

05±1680
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC B1261 ECM (ENGINE ECU) COMMUNICATION
STOP
CIRCUIT DESCRIPTION
DTC B1261 is output when communication between the ECM and integration relay stops for more than 10
seconds.
DTC No.DTC Detection ConditionTrouble Area
B1261No communication from ECM for more than 10 seconds
ECM

Wire harness
05C5Q±01

B67805
Battery23
+BMPX1
P±BECM
E10 13
E1
E11 48 BEAN
(EFI) Except for 1CD±FTV
E9
C1018
MPX2 E10 E9 P Combination Meter Assy
(Combination Meter ECU)
29 29
A15
A13 A/C Control Assy
(A/C ECU)
MPX+
E91
B±R*
2
B±R*1,
3IK1 EA112
B±R
B±R
E92 J14 J28DD
*
1: 1AZ±FE
*2: 1AZ±FSE
*
3: 1ZZ±FE, 3ZZ±FE
*
4: Except Automatic A/C
*5: Automatic A/C
*
6: LHD
*7: RHD
*
8: Unleaded Gasoline *
7*6*7*6
J14
J28DD
J14
J28DD
*
7*6
B±R
IE4 IP132
*
7*6
4
2
1 EFI NO.1
B±W
4 4
44 2
13
5
W±B
ECB±Y
2
1EFI+B2
BATT E93 B±Y
IE37
B±Y 71
1
1A
B±G4A
4B1
1
B±G
MainE12 9
10
*1,
3*2
*1,
3
*2
*4*5
*2 *1,
3
B±R
Engine Room R/B No. 4
J/C
EF*
1
EE*2
EH*3
EFI Relay
GR
To terminal MREL of ECM
Engine Room R/B
GR*8
To A/F Relay
IO17
*
7*6
1BR
*1,
2,
3
B±R*2
Engine Room R/B No. 4
Engine Room J/B No. 4
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05±1681
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM

B67806
1CD±FTVECM Combination Meter Assy
(Combination Meter ECU)
A/C Control Assy
(A/C ECU)
+BMPX1
E1 MPX2
BATT E9
E9
E9
E10
E12 P±BP
B±W B±W
B±W
B±Y
B±Y
*
1: LHD
*2: RHD
*
3: Except Automatic A/C
*
4: Automatic A/C 910 C1013
BEAN
(EFI)
A15
A13 MPX+20
21
1
2
7 IK18
EE110
1
1
1 1
2
15 3 ECIO17
BR
EI 1
12
EFI
1A
B3
3
Battery FL Main
*3 *4
W±B
Engine Room R/B
B±Y
Engine Room R/BTo terminal
MREL of ECM
B 1IE37
*1 *2
EFI MAIN Relay
Engine Room R/B
No. 3 05±1682
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)

B68027
Wire Harness Side
E10
*2
ECM
E9
*1,
3,
4
ECM
C10
Combination Meter Assy
(Combination Meter ECU)
A13
*5
A/C Control Assy
(A/C ECU)
A15
*6
A/C Control Assy
(A/C ECU)
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05±1683
AVENSIS REPAIR MANUAL (RM1018E)
1 CHECK RESISTANCE OF COMMUNICATION LINE
(a) Disconnect the E9 or E10 ECM, C10 and A13 or A15 ECU
connectors.
(b) Check the resistance between wire harness side connec-
tors.
Standard:
1AZ±FSE
Tester ConnectionSpecified Condition
E10±18 (MPX1) ± C10±13 (BEAN)
*5
E10±29 (MPX2) ± A13±9 (MPX+)Below 1

*6
E10±29 (MPX2) ± A15±10 (MPX+)
1AZ±FE, 1ZZ±FE, 3ZZ±FE
Tester ConnectionSpecified Condition
E9±23 (MPX1) ± C10±13 (BEAN)
*5
E9±29 (MPX2) ± A13±9 (MPX+)Below 1

*6
E9±29 (MPX2) ± A15±10 (MPX+)
1CD±FTV
Tester ConnectionSpecified Condition
E9±20 (MPX1) ± C10±13 (BEAN)
*5
E9±21 (MPX2) ± A13±9 (MPX+)Below 1

*6
E9±21 (MPX2) ± A15±10 (MPX+)
HINT:
*
1: 1AZ±FE
*
2: 1AZ±FSE
*
3: 1ZZ±FE, 3ZZ±FE
*
4: 1CD±FTV
*
5: Except Automatic A/C
*
6: Automatic A/C
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK