2005 TOYOTA AVENSIS diagnostic

B67867
1 2


B68491
Wire Harness Side
T6
Theft Warning ECU Assy
T12
Theft Warning Radar Sensor
05±1652
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
3 INSPECT REAR THEFT WARNING RADAR SENSOR (IN, OUT)
(a) Disconnect the T13 and T14 sensor connectors.
(b) Check the resistance between the sensor terminals.
Standard:
Tester ConnectionSpecified Condition
2 (MIN+) ± 1 (MIN±)10 k
or higher2 (MOU+) ± 1 (MOU±)10 k
or higher
NG REPLACE REAR THEFT WARNING RADAR
SENSOR
OK
4 CHECK WIRE HARNESS (THEFT WARNING ECU ASSY ± THEFT WARNING SEN-
SOR ASSY)
(a) Disconnect the T6 ECU connector.
(b) Disconnect the T12 sensor connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard:
Tester ConnectionSpecified Condition
T6±24 (S+B) ± T12±7 (S+B)
T6±26 (IOUT) ± T12±6 (IOUT)Below 1

T6±13 (SSW1) ± T12±3 (SOFF)
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK



B68492
Wire Harness Side
T12
Theft Warning Radar Sensor
T13
T14
Rear Theft Warning Radar Sensor
B67865
Wire Harness Side
T12
Theft Warning Radar Sensor
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
05±1653
AVENSIS REPAIR MANUAL (RM1018E)
5 CHECK WIRE HARNESS (THEFT WARNING SENSOR ASSY ± REAR THEFT
WARNING SENSOR ASSY (IN, OUT))
(a) Disconnect the T12, T13 and T14 sensor connectors.
(b) Check the resistance between the wire harness side con-
nectors.
Standard:
Tester ConnectionSpecified Condition
T12±5 (SOU+) ± T13±2 (MOU+)
T12±1 (SOU±) ± T13±1 (MOU±)Below 1
T12±8 (SIN+) ± T14±2 (MIN+)Below 1

T12±4 (SIN±) ± T14±1 (MIN±)
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
6 CHECK WIRE HARNESS (THEFT WARNING RADAR SENSOR ± BODY GROUND)
(a) Disconnect the T12 sensor connector.
(b) Check the resistance between the wire harness side con-
nector and the body ground.
Standard:
Tester ConnectionSpecified Condition
T12±2 (GND) ± Body groundBelow 1

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

B67700
CTLS
27 L±R
IM111 T15
Theft Warning Siren Assy
W±R
CI CC7
2
2
4AECU±B2 Fuse Block 10
1 W±R
B*
2
Battery Center J/B Assy
6T6
Theft Warning ECU Assy
BW
+B
3 W±R
B±G*
1
L±R
IM112
GND CONT
6
IP15
B±W B±W
Engine Room R/B
DCC
1 21
1 1A
B*
2B±G*1
4B
Main3
3 11W±B
*
1: Gasoline
*2: 1CD±FTV1
Engine Room
R/B No. 3 Engine Room
J/B No. 4
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
05±1647
AVENSIS REPAIR MANUAL (RM1018E)
THEFT WARNING SIREN CIRCUIT
CIRCUIT DESCRIPTION
The theft warning siren has an internal battery. If any of the vehicle's battery or communication line is opened,
the theft warning siren detects it by itself and sounds. Although the theft warning siren sounds by receiving
a signal from the theft deterrent ECU usually, the theft warning siren can sound by its internal battery in case
that the vehicle's battery is opened.
The theft deterrent ECU sends an arming signal to the theft warning siren while transferring to the armed
state, and it also sends a disarming signal to the siren while transferring to the disarmed state. Besides, the
theft deterrent ECU can cause the theft warning siren to sound by sending an alarm signal in the alarm
sounding state.
WIRING DIAGRAM
05BAG±01

B67858
T15
Theft Warning Siren Assy
*1: Wave Pattern
*
2: Wave PatternHIGH
(6.5 V or more)
HIGH
(6.5 V or more) LOW
(Below 1.0 V)
LOW
(Below 1.0 V)T1: 0.4 sec.
T2: 0.1 sec.
T3: 0.2 sec. T1
T2
T3
T1
T3T3
T2
T2
05±1648
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 INSPECT FUSE (ECU±B2, DCC)
(a) Remove the ECU±B2 fuse from the fuse block.
(b) Remove the DCC fuse from the engine room R/B.
(c) Check the resistance.
Standard: Resistance
NG REPLACE FUSE
OK
2 CHECK THEFT WARNING SIREN ASSY
(a) Check the voltage between each terminal of the connec-
tor and the body ground.
Standard:
Tester ConnectionConditionSpecified Condition
T15±1 (+B) ±
Body groundConstant10 to 14 V
T15±2 (GND) ±
Body groundConstantBelow 1 V
When switched from
armed state or arming
preparation state to dis-
armed state (1)
Using an oscilloscope*1
T15±3 (CONT) ±
Body groundWhen switched from arm-
ing preparation state to
armed state (2)
Using an oscilloscope*2
Normal condition
(Except (1) and (2))Approx. 1.4 V
Wave pattern:
NG REPLACE THEFT WARNING SIREN ASSY
OK



B68389
Wire Harness Side
T15
Theft Warning Siren Assy T6
Theft Warning ECU Assy
B68388
Wire Harness Side
T15
Theft Warning Siren Assy
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
05±1649
AVENSIS REPAIR MANUAL (RM1018E)
3 CHECK WIRE HARNESS (THEFT WARNING ECU ASSY ± THEFT WARNING SIREN
ASSY)
(a) Disconnect the T6 ECU connector.
(b) Disconnect the T15 siren connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard:
Tester ConnectionSpecified Condition
T6±27 (CTLS) ± T15±3 (CONT)Below 1

NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
4 CHECK WIRE HARNESS (THEFT WARNING SIREN ASSY ± BODY GROUND)
(a) Disconnect the T15 siren connector.
(b) Check the resistance between the wire harness side con-
nector and the body ground.
Standard:
Tester ConnectionSpecified Condition
T15±2 (GND) ± Body groundBelow 1

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

B67701
Battery MainEngine Room R/B12
1T7
Theft Warning ECU Assy
G
HORN
B±G*
1
HORN Relay
G±W20
1H11
Horn
(Low) W
H12
Horn
(High)IE1J26
J/C
B
HORN5 Engine Room R/B No. 2
B G G
32
2 2 2
5
W
1
1A 1
1 3
3
B±G*
1
B*2
B*2
4A
4B1
1
*
1: Gasoline
*2: 1CD±FTV Engine Room
R/B No. 3 Engine
Room J/B
No. 4
G±W 05±1644
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
HORN CIRCUIT
CIRCUIT DESCRIPTION
When the theft deterrent system is transferred from the armed state to the alarm sounding state, the theft
warning ECU switches on the HORN relay causing the horns to sound. The horn sounds at an interval of
0.4 seconds.
WIRING DIAGRAM
05BAF±01

B67416
B68374
21
5
3
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
05±1645
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 INSPECT FUSE (HORN)
(a) Remove the HORN fuse from the engine room R/B.
(b) Check the resistance.
Standard: Resistance
NG REPLACE FUSE
OK
2 INSPECT HORN ASSY (LOW PITCED, HIGH PITCHED)
(a) Check operation of the horn.
Standard:
Measurement ConditionSpecified Condition
Battery positive (+)
Terminal 1
Battery negative (±)
Horn bodyHorn blows
NG REPAIR OR REPLACE HORN ASSY
OK
3 INSPECT RELAY (HORN)
(a) Remove the HORN relay from the engine room R/B No.
2.
(b) Check operation of the HORN relay.
Standard:
Tester ConnectionSpecified Condition
10 kor higher
3 ± 5Below 1 
(When battery voltage is applied to terminals 1 and 2)
NG REPLACE RELAY
OK

B63408
Wire Harness Side
T6
Theft Warning ECU Assy


B68387
Wire Harness Side
H11
H12
Horn Assy Engine Room R/B No. 2
1
05±1646
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
4 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±5 (HORN) ± Body ground10 to 14 V
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
5 CHECK WIRE HARNESS (ENGINE ROOM R/B NO. 2 ± HORN ASSY)
(a) Remove the HORN relay from the engine room R/B No.
2.
(b) Disconnect the H11 and H12 horn connectors.
(c) Check the resistance between the wire harness side con-
nectors.
Standard:
Tester ConnectionSpecified Condition
3 ± H11±1Below 1
3 ± H12±1Below 1

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