1996 TOYOTA TERCEL engine

DI4MZ-01
THEFT DETERRENT SYSTEM Check Sheet
Inspector 's name:
Customer 's Name
Date of VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading / /km
Mile
Weather Conditions
When Problem
Occurred Frequency Problem OccursWeather
Outdoor temperature
/ /

Constant
Sometimes ( Times per day, month)

Once only Brought in

Theft deterrent system cannot be set.

Indicator light does not flash when the theft deterrent system is set.
(It stays on or does not light at all.)

Theft deterrent system
does not operate.
When unlocked using the
door lock knob.

When the engine hood is
opened.

System cannot be
canceled once set.
When door is unlocked using key or wireless door lock control system.

When the key is inserted in the ignition key cylinder and turned to ACC or ON
position.
(However, only when the system has never operated)

When the luggage compartment door is opened with the key.

System cannot be
canceled during warning
operation.
When door is unlocked using key or wireless door lock control system.

When the key is inserted in the ignition key cylinder and turned to ACC or ON
position.

Warning operation starts when the system is set and the door or luggage compartment door is opened with
the key.

Others.
Date Problem First Occurred

Fine
Cloudy
Rainy
Snowy

Various/Others

Hot
Warm
Cool

Cold (Approx. 5F ( 5C))
Problem Symptom
Malfunction

Horns only

Theft deterrent horn only

Headlights only

Taillights only

Starter cut only

Door lock operation only
DI-216
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
CUSTOMER PROBLEM ANALYSIS CHECK

DI4N0-02
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-217
1996 TERCEL (RM440U)
PRE-CHECK
1. SETTING OF THE THEFT DETERRENT SYSTEM
Setting Conditions
(a) Close all the doors.
(b) Close the engine hood and luggage compartment door.
(c) Remove the ignition key from the ignition key cylinder.
Setting Operation
When any of the following operations (a), (b) or (c) is performed, the theft deterrent indicator light will light
up as described.
(1) Lock the left or right front door using the key
(All doors are locked by key-interlinked lock operation).
(2) Lock all the doors using the wireless door lock control system.
(3) With the rear doors locked and with one of the front doors locked, lock the other front door without
using the key (keyless door lock).
Elapsed time after operationIndicator light
Within about 30 secondsLight up
After about 30 secondsBlinks *1
*1: 1 sec. or, 1 sec. off
HINT:
When the theft deterrent system is set, doors cannot be locked or unlocked with the door lock control switch
and the luggage compartment door cannot be unlocked with the luggage compartment door opener switch.
2. CANCELING OF THE THEFT DETERRENT SYSTEM IN THE SET CONDITION
Check if the theft deterrent indicator light is blinking.
Canceling Operation
When any of the following operations (a), (b), (c) or (d) is performed, the theft deterrent system is canceled
and indicator light will go off.
Condition
(1) Unlock the left or right front door using the key.
(2) Unlock all the doors using the wireless door lock control system.
(3) Insert the ignition key in the ignition key cylinder and turn it to the ACC or ON position
(This is operative only when the theft deterrent system has never operated).
(4) Unlock the luggage compartment door with the key. *1
*1: The theft deterrent system is temporarily canceled only while the luggage compartment door is open.
Approximately 2 seconds after the luggage compartment door is closed, the theft deterrent system is reset.
3. CHECK OF THE THEFT DETERRENT SYSTEM OPERATION
Check if the theft deterrent indicator light is blinking.
When any of the following operations (a) or (b) is performed, the system sounds the horns and theft deterrent
horn and flashes the headlights and taillights for about one minute to alert. At the same time, the system
disconnects the starter motor circuit and locks all doors (if all doors are not locked, the system repeats door
locking operation every 2 seconds during the one minute alert time).
(1) Open the engine hood using the engine hood opener lever.
(2) Unlock any of the front or rear doors without key operation.

DI4N1-01
N12446N12538I10188
Engine Hood Courtesy Switch
Engine Room R/B
Starter Relay
Horn Relay
Headlight Control Relay
HAZ-HORN Fuse
HEAD LH Fuse
HEAD RH Fuse
Theft Deterrent Horn HORN
Door Lock Control Relay or
Theft Deterrent ECU
Combination Meter
Theft Deterrent Indicator
Ignition Switch
Light Control Switch Clutch Start Switch
I/P J/B
Taillight COntrol Relay
TAIL Fuse
CIG & RAD Fuse
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-219
1996 TERCEL (RM440U)
PARTS LOCATION

DI4N2-02
I00302 I00303I00304
T4 T3
Theft Deterrent and Dor Lock Control ECU A
B
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-221
1996 TERCEL (RM440U)
TERMINALS OF ECM
TerminalsSymbolsConditionSTD Value
A2 - A3ACT- eACT+Ignition switch ºOFFº.Below 50 W
A4 - GroundE e GroundAlways.Below 1 W
A4 - A8E e ACCIgnition switch ºACCº.10 - 14 V
A9 - Ground+B2 e GroundAlways.10 - 14 V
B1 - Ground+B1 e GroundAlways.10 - 14 V
B2A4LSWRE
Door unlock detection switch ºONº.
(Rear door)Below 1 W
B2 e A4LSWR e EDoor unlock detection switch ºOFFº.
(Rear door)1 MW or higher
B3A4CTYE
Door courtesy switch ºONº.
(Except driver's door opened)Below 1 W
B3 eA4CTY e EDoor courtesy switch ºOFFº.
(Except driver's door closed)1 MW or higher
B4A4DSWLELuggage compartment door courtesy switch ºONº.Below 1 WB4 e A4DSWL e ELuggage compartment door courtesy switch ºOFFº.1 MW or higher
B5A4L1EDoor lock control switch ºLOCKº.Below 1 WB5 e A4L1 e EDoor lock control switch ºOFFº or ºUNLOCKº.1 MW or higher
B6A4UL3E
Door key lock and unlock switch
driver's door ºUNLOCKº.Below 1 W
B6 e A4UL3 e EDoor key lock and unlock switch
driver's door ºOFFº or ºLOCKº.1 MW or higher
B7A4DSWDE
Door courtesy switch ºONº.
(Driver's door opened)Below 1 W
B7 eA4DSWD e EDoor courtesy switch ºOFFº.
(Driver's door closed)1 MW or higher
B8A4UL1EDoor lock control switch ºUNLOCKº.Below 1 WB8 e A4UL1 e EDoor lock control switch ºOFFº or ºLOCKº.1 MW or higher
B9A4LUGELuggage compartment door key lock and unlock switch ºONº.Below 1 WB9 e A4LUG eELuggage compartment door key lock and unlock switch ºOFFº.1 MW or higher
B10 - A4HEAD e ELight control switch other than ºHEADº.10 - 14 V
B11 - A4SH e EAlways.10 - 14 V
B12 - A4IND e EIndicator light circuit.Below 1 W
B14A4DSWHEEngine hood courtesy switch ºONº.Below 1 WB14 e A4DSWH e EEngine hood courtesy switch ºOFFº.1 MW or higher

DI4N3-01
Details of Problem
The theft deterrent system cannot be set
Inspecting Circuit*1See page
DI-224 1. Indicator light circuit
4. Door courtesy switch circuit
5. Door unlock detection switch circuit
6. Engine hood courtesy switch circuit
The indicator light does not blink when system is setIndicator light circuit
When the
system is
set
When the rear door is unlocked
When the luggage compartment door is opened
by a method other than the key2. Luggage compartment door key
lock and unlock switch circuit
3. Luggage compartment door
courtesy switch circuit
When the engine hood is opened
The system
does not
operateDoor unlock detection switch circuit
Luggage compartment door
courtesy switch circuit
Engine hood courtesy switch circuit
While the system is
in warning operation
Horns do not sound
Theft deterrent horn does not sound
Headlights do not flash
Taillights do not flash
The starter cut is not cut off
The rear door lock is not locked in unlock conditionHorn relay circuit
Theft deterrent horn circuit
Headlight control relay circuit
Taillight control relay circuit
Starter relay circuit
Door unlock detection switch circuit
It is not canceled when the ignition key is turned to
ACC or ON position
It still operates when the luggage compartment door is
opened with the key When the
system is
setIgnition switch circuit
Luggage compartment door key
lock and unlock switch circuit
System is still set even when a rear door is open Door courtesy switch circuit
Even when the
system is not
setHorns sound
Theft deterrent horn sounds
Headlights stay on
Taillights stay onHorn relay circuit
Theft deterrent horn circuit
Headlight control relay circuit
Taillight control relay circuit
DI-241
DI-239
DI-244
DI-213
DI-246
DI-224
DI-213
DI-239
DI-246
DI-231
DI-228
DI-233
DI-235
DI-226
DI-213
DI-237
DI-241
DI-244
DI-231
DI-228
DI-233
DI-235
*1: If numbers are given to the circuit, proceed with troubleshooting in the order indicated by those numbers.
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-223
1996 TERCEL (RM440U)
PROBLEM SYMPTOMS TABLE
Proceed to the reference page shown in the matrix chart below for each malfunction symptom and trouble-
shoot for each circuit.
HINT:
Troubleshooting of the theft deterrent system is based on the premise that the door lock control system is
operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that
the door lock control system is operating normally.

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