2005 TOYOTA AVENSIS Circuit

B66226
T8
Transponder Key ECU Assy
10KSW
12 U1
Un±lock Warning
Switch Assy
IO: Gasoline
IL: 1CD±FTV J16
J/C W±BW±B
Y
J22F
J23 DJ/C
AY
W±B*
1
W±B*2
*1: LHD
*2: RHD IP CA 6CF 13
Center J/BY*
2
DA 6
DA8
Y*
1
Driver Side J/B*1
Passenger Side R/B Assy*2
Y*1
Y*2
W±BA
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
05±1613
AVENSIS REPAIR MANUAL (RM1018E)
DTC B2780 PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION
CIRCUIT DESCRIPTION
This DTC will be output if the transponder key ECU does not detect that the unlock warning switch is ON
even when the ignition switch is ON (Under normal conditions, the unlock warning switch is ON when the
ignition switch is ON).
DTC No.DTC Detection ConditionTrouble Area
B2780Unlock warning switch ON is not detected when ignition
switch is ON
Unlock warning switch assy

Wire harness

Transponder key ECU assy
WIRING DIAGRAM
05B0C±03

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05±1689
AVENSIS REPAIR MANUAL (RM1018E)
DTC B1269 THEFT DETERRENT ECU COMMUNICATION
STOP
CIRCUIT DESCRIPTION
DTC B1269 is output when communication between the theft warning ECU and the combination meter stops
for more than 10 seconds.
DTC No.DTC Detection ConditionTrouble Area
B1269No communication from theft deterrent ECU for more than
10 seconds
Theft warning ECU assy

Wire harness
05AEV±02

± 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

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

05±1670
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC B1214 DOOR SYSTEM COMMUNICATION BUS
MALFUNCTION (+B SHORT)
DTC B1215 DOOR SYSTEM COMMUNICATION BUS
MALFUNCTION (GND SHORT)
CIRCUIT DESCRIPTION
DTCs B1214 and B1215 are output when +B and the body ground is short±circuited on the communication
bus. Detecting this condition disables all the BEAN communication and outputs some DTCs.
DTC No.DTC Detection ConditionTrouble Area
B1214Communication circuit and +B battery system short

ECM

A/C control assy (A/C ECU)

Combination meter assy

Theft warning ECU assy

Wire harness

Instrument panel J/B assy (Integration relay)
B1215Communication circuit and body ground short

ECM

A/C control assy (A/C ECU)

Combination meter

Theft warning ECU assy

Wire harness

Instrument panel J/B assy (Integration relay)
05C5P±01

B69061
Theft Warning ECU Assy Combination Meter Assy
(Combination Meter ECU) A/C Control Assy
(A/C ECU)Instrument Panel J/B Assy
(Integration Relay)
ECM
T6 connector C10 connector
05±1674
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
3 CHECK WIRE HARNESS
(COMBINATION METER ECU ± THEFT WARNING ECU ASSY)
(a) Disconnect the combination meter ECU and theft warning ECU connectors.
(b) Check the wire harness (MPX line) between the combination ECU and theft warning ECU.
(1) Turn the ignition switch ON.
(2) Check the voltage between the wire harness (MPX line) and the body ground.
Standard:
Tester ConditionSpecified Condition
BEAN (SECURITY) (C10±15) or MPX (T6±31) ± Body ground0 V
If the output voltage is not 0 V, the wire harness (MPX line) may be short±circuited with +B.
(3) Check the resistance between the wire harness (MPX line) and the body ground.
Standard:
Tester ConditionSpecified Condition
BEAN (SECURITY) (C10±15) or MPX (T6±31) ± Body ground10 kor higher
When the resistance is 10 kor higher, the wire harness (MPX line) and body ground may be short±circuited
with the body ground.
NO REPAIR OR REPLACE HARNESS AND
CONNECTOR
YES
REPLACE COMBINATION METER ASSY (COMBINATION METER ECU)

B67602
Theft Warning ECU Assy Combination Meter Assy
(Combination Meter ECU) A/C Control Assy
(A/C ECU)Instrument Panel J/B Assy
(Integration Relay)
ECM
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05±1679
AVENSIS REPAIR MANUAL (RM1018E)
8 CHECK WIRE HARNESS
(INTEGRATION RELAY ± A/C ECU)
(INTEGRATION RELAY ± COMBINATION METER ECU)
(a) Disconnect the A/C ECU, combination meter ECU and integration relay connectors.
(b) Check the wire harness (MPX lines) between the integration relay and A/C ECU as well as in between
the integration relay and combination ECU.
(1) Turn the ignition switch ON.
(2) Check the voltage between the wire harness (MPX lines) and the body ground.
Standard:
Tester ConditionSpecified Condition
Integration relay or A/C ECU ± Body ground0VIntegration relay or combination meter ECU ± Body ground0 V
If the output voltage is not 0 V, the wire harness (MPX line) may be short±circuited with +B.
(3) Check the resistance between the wire harness (MPX lines) and the body ground.
Standard:
Tester ConditionSpecified Condition
Integration relay or A/C ECU ± Body ground10 kor higherIntegration relay or combination meter ECU ± Body ground10 kor higher
When the resistance is 10 kor higher, the wire harness (MPX line) and body ground may be short±circuited
with the body ground.
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY (INTEGRATION RELAY)

05AEQ±02
05±1656
±
DIAGNOSTICS MULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit\
listed for that code in the chart
below (Proceed to the page given for that circuit).
DTC No.
(See Page)Detection ItemTrouble Area
B1214
(05±1670)Door System Communication Bus Malfunction (+B Short)

Wire harness

ECM

A/C control assy (A/C ECU)

Theft warning ECU assy

Combination meter assy (Combination meter ECU)

Instrument panel J/B assy (Integration relay)
B1215
(05±1670)Door System Communication Bus Malfunction (GND Short)

Wire harness

ECM

A/C control assy (A/C ECU)

Theft warning ECU assy

Combination meter assy (Combination meter ECU)

Instrument panel J/B assy (Integration relay)
B1261
(05±1680)ECM Communication Stop
Wire harness

ECM
B1262
(05±1685)A/C ECU Communication Stop
Wire harness

A/C assy (A/C ECU)
B1269
(05±1689)Theft Deterrent ECU Communication Stop
Wire harness

Theft warning ECU assy
B1271
(05±1693)Combination Meter ECU Communication Stop
Wire harness

Combination meter assy (Combination meter ECU)