Page 3265 of 4770
I00262
Theft Deterrent ECU
HORN
T3
12
G±B IG1
11
G±B
C CJ/C J2
G±B
G±W1
1
Horn
E/G Room J/B No.2
HORN Relay
31
2F
10
2K2 5
1 HORN
12A
B
1
F6
FL BLOCK
1
F4
B±G
FL MAIN
Battery
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI±845
1080 Author: Date:
Horn Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch ON and OFF in approxi-
mately 0.4 sec. cycles. This switches the horn relay ON and OFF, thus the horns blow (See the wiring dia-
gram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the horn relay
switches off, thus stopping the horns from blowing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
(5) Push the panic switch of the wireless door lock control system.
WIRING DIAGRAM
DI06W±06
Page 3266 of 4770
I01923
HORN
DI±846
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
1081 Author: Date:
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the horns blow normally whenever the horn switch is oper-
ated. If horn operation is not normal when the horn switch is operated, check the horn switch.
1 Check voltage between terminal HORN of theft deterrent ECU connector and
body ground.
PREPARATION:
Disconnect the theft deterrent ECU connectors.
CHECK:
Measure voltage between terminal HORN of theft deterrent
ECU connector and body ground.
OK:
Voltage: 10 ± 14 V
NG Check and repair harness and connector be-
tween theft deterrent ECU and horn relay.
OK
Check and replace theft deterrent ECU.
Page 3267 of 4770

I08428
E/G Room J/B No.2
Theft Deterrent ECU Headlight
Control Realy
FL MAIN
Battery 3
2BMAIN
HEAD R±B B
3 4
1
28
2K
32G
1
F61
F4Light Control Switch
(COMB. SW)
*1
Daytime Running
Light Relay*2
Daytime Running
Light Relay7
IG310
T3 R±B
*1
R±B*2R*2
19J32
*1
J6*2
J/C
*1: w/o Daytime Running Light
*2: w/ Daytime Running Light2BB
FL BLOCK
B±GR±B
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI±847
1082 Author: Date:
Headlight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch ON and OFF at approxi-
mately 0.4 sec. intervals. This switches the headlight control relay ON and OFF, thus flashing the headlights
(See the wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes OFF and the headlight
control relay switches OFF, thus stopping the headlights flashing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
(5) Push the panic switch of the wireless door lock control system.
WIRING DIAGRAM
DI06X±06
Page 3268 of 4770
I01924
HEAD
DI±848
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
1083 Author: Date:
INSPECTION PROCEDURE
HINT:The flow chart below is based on the premise that the headlights light up normally whenever the light
control switch is operated. If headlight operation is not normal when the light control switch is operated, pro-
ceed to troubleshooting on page BE±2.
1 Check voltage between terminal HEAD of theft deterrent ECU connector and
body ground.
PREPARATION:
Disconnect the theft deterrent ECU connector.
CHECK:
Measure voltage between terminal HEAD of theft deterrent
ECU connector and body ground.
OK:
Voltage: 10 ± 14 V
NG Check and repair harness and connector be-
tween theft deterrent ECU and headlight control
relay (See page IN±31).
OK
Check and replace theft deterrent ECU.
Page 3269 of 4770

I00266
Theft Deterrent ECU
TAIL
T3
11
G±R
B BJ/C J33
G±R
10
IG1
G±RA
AJ2
J/C
G±R 1C
6
2
3
Taillight Control Relay
1
5
TAIL81S
1C
9
1B
4 Instrument Panel J/B
B±R
Light
Failure
Sensor
Turn & Clearance
Light
1F9
F4
1
FL
BLOCK
FL MAIN
Battery
B±G ALT
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI±849
1084 Author: Date:
Taillight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch ON and OFF at approxi-
mately 0.4 sec. intervals. This switches the taillight control relay ON and OFF, thus flashing the taillights (See
the wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes OFF and the taillight control
relay switches OFF, thus stopping the taillights flashing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
(5) Push the panic switch of the wireless door lock control system.
WIRING DIAGRAM
DI06Y±06
Page 3270 of 4770
I01925
TAIL
DI±850
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
1085 Author: Date:
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the taillights light up normally whenever the light control
switch is operated. If taillight operation is not normal when the light control switch is operated, proceed to
troubleshooting on page BE±2.
1 Check voltage between terminal TAIL of theft deterrent ECU connector and body
ground.
PREPARATION:
Disconnect the theft deterrent ECU connector.
CHECK:
Measure voltage between terminal TAIL of theft deterrent ECU
connector and body ground.
OK:
Voltage: 10 ± 14 V
NG Check and repair harness and connector be-
tween theft deterrent ECU and taillight control
relay (See page IN±31).
OK
Check and replace theft deterrent ECU.
Page 3271 of 4770
I01927
Theft Deterrent ECU
T4
13
IG B±R B
J17
C
J16B±R Instrument Panel J/B
8
1
ECU±IG
1
1B AM1
2
1K
4 B±Y AM1
2Ignition Switch
W
B±R
B±R 1
F9 ALT
FL BLOCK
F4
1
B±G
FL MAIN
Battery
1D
1K
IG1
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI±851
1086 Author: Date:
Ignition Switch Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU. Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to the
terminals ACC and IG of the ECU. When the battery positive voltage is applied to the terminal ACC of the
ECU while the theft deterrent system is activated, the warning stops. Furthermore, power supplied from the
terminals ACC and IG of the ECU is used as power for the door courtesy switch, and position switch, etc.
WIRING DIAGRAM
DI06Z±06
Page 3272 of 4770
I00269
Instrument panel J/B:
ECU±IG Fuse
I01926
IG (+) (±)
DI±852
± DIAGNOSTICSTHEFT DETERRENT SYSTEM
1087 Author: Date:
INSPECTION PROCEDURE
1 Check CIG and ECU±IG fuses.
PREPARATION:
(a) Remove the fuse box opening cover.
(b) Remove ECU±IG fuses from instrument panel junction
block No.1.
CHECK:
Check continuity of ECU±IG fuses.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the ECU±IG fuses (See at-
tached wiring diagram).
OK
2 Check voltage between terminal IG of theft deterrent ECU and body ground.
PREPARATION:
(a) Disconnect the theft deterrent ECU connectors.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IG of theft deterrent ECU
connector and body ground.
OK:
Voltage: 10 ± 14 V
NG Check and repair harness and connector be-
tween theft deterrent ECU and battery
(See page IN±31).
OK
Check and replace theft deterrent ECU.