TOYOTA TERCEL 1996 Service Repair Manual

N20818
Battery MAIN FL B
EA21Engine Room Relay BlockMAIN AM2 22
Starter Relay
2
2B
EA17
S21
Starter B-R2
IC1B-R25
T4
SRLY
B-R
IC1
12 B-RIgnition Switch
78
IG2
7B
23
EA1
14A AJUNCTION
CONNECTOR
B-W
(A/T) Park/Neutral
Position Switch Clutch Start Switch
1
2
B-W3
IG2B-W
(M/T)Theft Deterrent ECU
C6
I10
P1J1
B-W
B-W
DI-226
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
Starter Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact (a) in the ECU becomes open, creating an open circuit
in terminal SRLY circuit and making the starter inoperative (starter cut).
In this condition, if one of the following operations is done, the contact (a) in the ECU is grounded, thus can-
celing the starter cut:
(1) Unlock the front LH or RH door with key.
(2) Unlock the doors with the wireless door lock control system.
WIRING DIAGRAM
DI4N5-02

BE3841N14680I09775
SRLY
(+)(-) Disconnect START
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-227
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
HINT:
This troubleshooting is based on the premise that engine cranking occurs.
If the engine does not crank, proceed to the engine troubleshooting on DI-1.
1 Check voltage between terminal SRLY of theft deterrent ECU connector and
body ground.
PREPARATION:
(a) Disconnect the theft deterrent ECU connector.
(b) Transmission in neutral position.
CHECK:
Measure voltage between terminal SRLY of theft deterrent ECU
connector and body ground, when ignition switch is turned to
ST position.
OK:
Voltage: 10 - 14V
OK Check and repair theft deterrent ECU.
NG
Check and repair harness and connector between starter and theft deterrent ECU
(See page IN-26).

N20819
Theft Deterrent ECU
SH T411
V-W IC2
4
V-W
1
2
W
Engine Room
Relay Block
MAIN FL
Battery 2
1
EA2BB
Theft Deterrent Horn
HAZ-HORN
W
T1 DI-228
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
Theft Deterrent Horn Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact (a) and contact (b) in the ECU close alternately in cycles
of approximately 0.2 sec., causing the theft deterrent horn to blow (See the wiring diagram below).
In this condition, if any of the following operations is done, the contact (a) in the ECU opens, thus stopping
the theft deterrent horn 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.
WIRING DIAGRAM
DI4N6-02

BE4061I05891I09776
1
OFF
Disconnect
(-) (+)
N14682
1
2
(+)
(-)
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-229
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check voltage between terminal 1 of theft deterrent horn connector and body
ground.
PREPARATION:
Remove the theft deterrent horn and disconnect the connector.
CHECK:
Measure voltage between terminal 1 of theft deterrent horn
connector and body ground.
OK:
Voltage: 10 - 14V
NG Check and repair harness and connector be-
tween HORN fuse and theft deterrent horn.
OK
2 Check theft deterrent horn.
CHECK:
Connect positive
lead to terminal 1 and negative  lead to
terminal 2 to theft deterrent horn connector.
OK:
Theft deterrent horn blows.
NG Replace theft deterrent horn.
OK

DI-230
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
3 Check harness and connector between theft deterrent ECU and theft deterrent
horn (See page IN-26).
NG Check and repair harness or connector.
OK
Check and replace theft deterrent ECU.

N20820
BatteryMAIN FL
B1
EA2 HAZ-HORN
2 W2Engine Room Relay Block
Horn Relay
11
2
2IC1G-Y24
T4
G-R
1
HORNTheft Deterrent ECU
HORN
H4 G-Y
B
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-231
1996 TERCEL (RM440U)
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 approximately
0.4 sec. cycles. This switches the horn relay on and off, thus the horns blow (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 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.
WIRING DIAGRAM
DI4N7-01

BE4061I05892I09777
HORN
(+) (-)OFF
Disconnect
DI-232
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the horns blow normally whenever the horn switch is oper-
ated.
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: 10~14V
OK Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between theft deterrent ECU and horn relay.

N20821
BatteryHeadlight
LHHeadlight
RH MAIN FL B 1
EA2
R
R-L2
2HEAD LH
HEAD RH2 B-R Engine Room Relay Block
Headlight Control Relay
2
2R-L
IC1
16
Light Control
Switch
(Combination
Switch)
13R-L R-L10
T4 Theft Deterrent ECU
HEAD
C12
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-233
1996 TERCEL (RM440U)
Headlight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU for switch on and off at approximate-
ly 0.4 sec. cycles. 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.
WIRING DIAGRAM
DI4N8-02

BE3843N14684I09778
HEAD
(-)(+)
Disconnect
DI-234
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the headlights flash normally whenever the light control
switch is operated. If headlight operation is not normal when the light control switch is operated, proceed
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 - 14V
OK Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between theft deterrent ECU and headlight control
relay.

N20822
Battery MAIN FL 1
F6 F7ALT B-R
Taillight
LH Taillight
RH 2
EA2B-R
G 1J1Instrument Panel Junction Block
Taillight Control Relay
TAIL4
1E
8
1L
G G LGTheft Deterrent ECU
23
T4 TAIL
1
B
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-235
1996 TERCEL (RM440U)
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 approximately
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.
WIRING DIAGRAM
DI4N9-01