1996 TOYOTA TERCEL light

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

DI-222
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
B15A4LSWDE
Door unlock detection switch ºONº.
(Driver's)Below 1 W
B15 e A4LSWD e EDoor unlock detection switch ºOFFº.
(Driver's)1 MW or higher
B16A4UL2E
Door key lock and unlock switch ºUNLOCKº.
(Passenger's)Below 1 W
B16 e A4UL2 e EDoor key lock and unlock switch ºOFFº or ºLOCKº.
(Passenger's)1 MW or higher
B19A4DSWPEDoor courtesy switch ºONº. (Passenger's)Below 1 WB19 eA4DSWP e EDoor courtesy switch ºOFFº. (Passenger's)1 MW or higher
B20 eA4KSW e E
Key unlock warning switch ºONº.
(Key is inserted into key cylinder)Below 1 WB20 eA4KSW e E
Key unlock warning switch ºOFFº.1 MW or higher
B21A4LSWPEDoor unlock detection switch ºOFFº. (Passenger's)Below 1 WB21 e A4LSWP e EDoor unlock detection switch ºONº. (Passenger's)1 MW or higher
B22A4L2E
Door key lock and unlock switch ºLOCKº.
(Driver's)Below 1 W
B22 e A4L2 e EDoor key lock and unlock switch ºOFFº or ºUNLOCKº.
(Driver's)1 MW or higher
B23 - A4TALL e ELight control switch ºOFFº.10 - 14 V
B24 - A48HORN e EHorn switch ºOFFº.10 - 14 V
B25 - A4SRLY e EIgnition switch is turned to ºSTº.
(When park / neutral position switch ºPº position)10 - 14 V

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.

DI4N4-02
N12887
Theft Deterrent ECU
5 Theft Deterrent
Indicator Light
(in Combination Meter)
2
IND 12
W-B
IDGR-R
T4 C9
C9
DI-224
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
CIRCUIT INSPECTION
Indicator Light Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is preparing to set, this circuit lights up the indicator light. When the system
has been set, it continually turns the indicator light on for 1 second and turns it off for 1 second, thus blinking
the indicator light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check indicator light.
PREPARATION:
Remove combination meter.
CHECK:
Connect positive
lead to terminal C5 and negative  lead to terminal C2 of combination meter connector
then check indicator light comes on.
NG Replace combination meter.
OK

- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-225
1996 TERCEL (RM440U)
2 Check harness and connector between theft deterrent ECU and indicator light,
indicator light and body ground (See page IN-26).
NG Repair or replace harness or connector.
OK
Check and replace theft deterrent ECU.*1
*1: When there is a malfunction that the theft deterrent system cannot be set, proceed to the next numbered
circuit inspection shown on matrix chart (See page DI-223).

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