1996 TOYOTA TERCEL Service Repair Manual

N15248
1 2
3
DI-210
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check door key lock and unlock switch.
PREPARATION:
(a) Remove the door trim and service hole cover.
(b) Disconnect the door key lock and unlock switch connec-
tor.
CHECK:
Check continuity between terminals 1, 3 and 2 or door key lock
and unlock switch connector, when door key lock and unlock
switch is turned to the lock side, unlock side and not turned.
OK:
Switch positionTester connectionSpecified condition
Lock side2 - 3Continuity
Unlock side1 - 2Continuity
OFF-No continuity
NG Replace door key lock and unlock switch.
OK
2 Check harness and connectors between ECU and switch, switch and body
ground (See page IN-26).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page DI-196).

I10187
IEW-B
1 Key Unlock Warning Switch
2
LGT420
KSW Theft Deterrent ECU
N14675SR4824
I09773
2
1
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-21 1
1996 TERCEL (RM440U)
Key Unlock Warning Switch Circuit
CIRCUIT DESCRIPTION
The key unlock warning switch goes on when the ignition key is inserted in the key cylinder and goes off when
the ignition key is removed.
The ECU operates the key confinement prevention function while the key unlock warning switch is on.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check key unlock warning switch.
PREPARATION:
Disconnect key unlock warning switch connector.
CHECK:
Check continuity between terminals 1 and 2 of key unlock warn-
ing switch connector, when the key is inserted to the key cylin-
der or removed.
OK:
Switch positionTester connectionSpecified condition
ON (Key inserted)1 - 2Continuity
OFF (Key removed)-No continuity
NG Replace key unlock warning switch.
OK
DI4MW-02

DI-212
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
2 Check harness and connectors between ECU and key unlock warning switch,
key unlock warning switch and body ground (See page IN-26).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page DI-196).

N12886
Theft Deterrent ECU J6
JUNCTION
CONNECTOR
ID110
W-BA
ID1
A AW-B
W-B J3
JUNCTION
CONNECTOR2
IH1 A
ADoor Unlock Detection Switch
W-B
Passenger's
Rear Left
Rear Right BJ11
BK11P-L
3
BG
IH1
Y 1
33
T4 15
W-B W-BW-BP-L
P-L 1
1
321
T4 21
T42 P
IE24
Y Y
Y Y
BK13 BJ13 12LSWD
LSWP
LSWR Driver's
W-B W-B
IE
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-213
1996 TERCEL (RM440U)
Door Unlock Detection Switch Circuit
CIRCUIT DESCRIPTION
The door unlock detection switch is built in the door lock motor assembly. This switch is on when the door
lock knob is in the unlock position and off when the lock knob is in the lock position.
The ECU detects the front door lock knob conditions in this circuit. It is used as one of the operating condi-
tions for the key confinement prevention function.
WIRING DIAGRAM
DI4MX-02

BE4061I05889I09774
Front Door
Rear Door21
31
Disconnect
DI-214
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check door unlock detection switch.
PREPARATION:
(a) Remove the door trim and service hole cover.
(b) Disconnect door unlock detection switch connector.
CHECK:
Check continuity between terminals 1 and 2 (3) of door unlock
detection switch connector, when the door lock knob is oper-
ated to the lock side and unlock side.
OK:
Switch ConditionTester connectionSpecified condition
Door unlock1 - 2 (3)Continuity
Door lock-No continuity
( ): Rear Door
NG Replace door unlock detection switch.
OK
2 Check harness and connectors between door lock control ECU and door unlock
detection switch, door unlock detection switch and body ground
(See page IN-26).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page DI-196).

DI4MY-01
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Problem does not occur
Matrix Chart of Problem Symptoms
Circuit Inspection
Identification of Problem
Repair
Confirmation Test
EndTitles inside
are titles of pages in this
manual, with the page number indicated in
the bottom portion. See the indicated pages
for detailed explanations. 1
23
4
5
7
Step 5, 7 : Diagnostic steps permitting the use of
the TOYOTA hand- held tester or
TOYOTA break-out-box. P. DI-216
P. DI-223
P. IN-16
P. DI-224 - DI-246
Problem occurs
6
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-215
389 Author
: Date
:
1996 TERCEL (RM440U)
THEFT DETERRENT SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
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.
For troubleshooting using a volt/ohm meter, see pages DI-215.
Be sure to use troubleshooting procedure appropriate to the diagnostic tool being used.
Perform troubleshooting in accordance with the procedure on the following page.

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.