TOYOTA AVENSIS 2005 Service Repair Manual

05±1620
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC B2795 UNMATCHED KEY CODE
CIRCUIT DESCRIPTION
This DTC is output when a key with a key code that has not been registered in the ECU is inserted into the
ignition key cylinder.
DTC No.DTC Detection ConditionTrouble Area
B2795Key with unregistered key code is inserted
Key
INSPECTION PROCEDURE
1 DELETE DTC AND INSERT ALL PRESENTLY AVAILABLE KEYS TO CHECK
WHETHER ENGINE STARTS OR NOT
OK NO PROBLEM
(BECAUSE OF KEY RE±REGISTRATION)
NG
REPLACE KEY THAT WILL NOT START ENGINE
05B0G±03

± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
05±1619
AVENSIS REPAIR MANUAL (RM1018E)
DTC B2794 UNMATCHED ENCRYPTION CODE
CIRCUIT DESCRIPTION
This DTC is output when a key with an incomplete key code is inserted into the ignition key cylinder.
DTC No.DTC Detection ConditionTrouble Area
B2794Key with incomplete key code is inserted
Key
INSPECTION PROCEDURE
1 REPLACE KEY
05B0F±03

05±1618
±
DIAGNOSTICS ENGINE IMMOBILISER SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC B2793 TRANSPONDER CHIP MALFUNCTION
CIRCUIT DESCRIPTION
This DTC is output when a malfunction is found in a key during the key code \
registration or the key code
is not registered normally. Replace the key when the key code registration is not performed normal\
ly and
this DTC is detected.
DTC No.DTC Detection ConditionTrouble Area
B2793Transponder chip malfunction
Key
INSPECTION PROCEDURE
1 CHECK DTC
(a)Delete the DTC (See page 05±1602).
(b) Insert the key into the ignition key cylinder.
(c) Check that no code is output.
OK NO PROBLEM
NG
2 RE±REGISTER KEY
(a)Delete the DTC (See page 05±1602).
(b) Re±register the key and check that the engine starts with the key. OK NORMAL
NG
REPLACE KEY
05B0E±03

B62676
I12
Transponder Key AmplifierT8
Transponder Key ECU Assy
VC5
CODE
TXCT
AGND Y±B
Y±G
L±R
GR±R8
11
12
13 1
4
5
7 TXCT
GND
ANT2 ANT1 VC5
CODE
CoilAmplifier
05±1616
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC B2784 ANTENNA COIL OPEN/SHORT
CIRCUIT DESCRIPTION
The transponder key coil is built into the transponder key amplifier and receives a key code signal from the
transponder chip in the key. This signal is amplified by the amplifier and then output to the transponder key
ECU.
DTC No.DTC Detection ConditionTrouble Area
B2784Antenna coil is open/short

Wire harness

Transponder key amplifier

Transponder key ECU assy
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 2 when not using the
hand±held tester.
1 READ VALUE OF HAND±HELD TESTER
(IMMOBILISER ECU (TRANSPONDER KEY ECU ASSY) (SWITCH CONDITION))
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON with the key that will not start the engine.
(c) Select the item ANTENNA COIL on the hand±held tester.
OK: NORMAL
NG: FAIL
OK CHECK AND REPLACE TRANSPONDER KEY
ECU ASSY
NG
05B0D±03




 

B64974
I12
Transponder Key Amplifier Wire Harness Side
T8
Transponder Key ECU Assy
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
05±1617
AVENSIS REPAIR MANUAL (RM1018E)
2 CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY ± TRANSPONDER KEY
AMPLIFIER) (TRANSPONDER KEY ECU ASSY OR
TRANSPONDER KEY AMPLIFIER ± BODY GROUND)
(a) Disconnect the T8 ECU and I12 amplifier connectors.
(b) Check the resistance of the wire harness side connectors.
Standard:
Tester ConnectionSpecified Condition
T8±8 (VC5) ± I12±1 (VC5)
T8±11 (CODE) ± I12±4 (CODE)Below 1
T8±12 (TXCT) ± I12±5 (TXCT)Below 1

T8±13 (AGND) ± I12±7 (GND)
T8±8 (VC5) or I12±1 (VC5) ±
Body ground
T8±11 (CODE) or I12±4 (CODE) ±
Body ground
10 k
or higherT8±12 (TXCT) or I12±5 (TXCT) ±
Body ground10 k
or higher
T8±13 (AGND) or I12±7 (GND) ±
Body ground
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE TRANSPONDER KEY AMPLIFIER

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

B51903
PushedFree
05±1614
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 2 when not using the
hand±held tester.
1 READ VALUE OF HAND±HELD TESTER
(TRANSPONDER KEY ECU (SWITCH CONDITION))
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON with the key that will not start the engine.
(c) Select the item KEY SW on the hand±held tester.
OK:
OFF
Key is in ignition key cylinder
ON
No key is in ignition key cylinder
OK REPLACE TRANSPONDER KEY ECU ASSY
NG
2 INSPECT UNLOCK WARNING SWITCH ASSY
(a) Remove the unlock warning switch.
(b) Inspect the unlock warning switch resistance.
Standard:
Tester ConnectionSwitch PositionSpecified Condition
12
Switch pushed
(Key set)Below 1

1 ± 2Switch free
(Key removed)10 k
or higher
NG REPLACE UNLOCK WARNING SWITCH ASSY
OK


B65751
T8
Transponder Key ECU Assy
U1
Unlock Warning Switch Assy Wire Harness Side
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
05±1615
AVENSIS REPAIR MANUAL (RM1018E)
3 CHECK WIRE HARNESS
(TRANSPONDER KEY ECU ASSY ± UNLOCK WARNING SWITCH ASSY)
(UNLOCK WARNING SWITCH ASSY ± BODY GROUND)
(a) Disconnect the T8 ECU and U1 switch connectors.
(b) Check the resistance between the wire harness side con-
nectors.
Standard:
Tester ConnectionSpecified Condition
T8±10 (KSW) ± U1±2Below 1

U1±1 ± Body groundBelow 1

NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE TRANSPONDER KEY ECU ASSY

± 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

B67807
Main
Battery 131
+B1MPX
E Theft Warning ECU Assy
B*
2
2H 5J/C
IP2 T6
W±R
B±G*
1
1A6
T6 IP1
B±W
CG B±W
1
*
1: Except 1CD±FTV
*2: 1CD±FTV BEAN
(SECURITY)
3W±B 1Combination Meter Assy
(Combination Meter ECU)
P±L
C1015
J27
J26F
W±R
6
1 DOME
2
T6 29
CA9
6
W±B *
2
B
*1
B±G
4A
4B
31
1
Engine Room J/B No. 4*1
Engine Room R/B
Engine Room
R/B No. 3*
2
Center J/B Fuse Block Assy
DCC 05±1690
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM