TOYOTA TERCEL 1996 Service Repair Manual

N15259
Theft Deterrent ECU
(Door Lock Control Relay)
Door Lock Control Switch
Driver's
(Door Lock Control Switch
Passenger's)
( ): w/o Theft Deterrent System IEJ6
JUNCTION
CONNECTORID110
W-B
A
IH13 ID11D9 (10)
T45
D9 (11)
T48L1
UL1 ID12
IH12 LOCK
UNLOCK
LOCK
UNLOCK AA W-B
W-B
W-B
W-B IH1 12
J3
JUNCTION
CONNECTOR A
A1 2
4
3
(3)
(2)R-Y
G-Y
R-Y
G-YR-Y
G-Y
R-Y
G-Y (4) DI-206
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
Door Lock Control Switch Circuit
CIRCUIT DESCRIPTION
When the door lock control switch is pushed to the lock side, Lock terminal of the switch is grounded, and
when the switch is pushed to the unlock side, Unlock terminal is grounded (See wiring diagram below).
WIRING DIAGRAM
DI4MU-02

I05887
(-) (+)ON
3
2
RH LH
43
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-207
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check voltage between terminals 2(3), 1(1) of door lock control switch connector
and body ground.
PREPARATION:
Remove the door trim and service hold cover.
CHECK:
(a) Turn ignition switch ON.
(b) Measure voltage between terminals 3(2), 4(3) of door lock
control switch connector and body ground, when door
lock control switch is pressed to the lock side, unlock side
and not pressed.
OK:
S it h itiTerminalSwitch position3(2)4(3)
Lock sideBelow 1 V8 - 10 V
Unlock side8 - 10 VBelow 1 V
OFF8 - 10 V8 - 10 V
HINT:
The terminal number without brackets is for the LH, the number
with brackets is for the RH.
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-196).
NG

N15247
3
2 RH LH
43
214
DI-208
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
2 Check door lock control switch.
PREPARATION:
Disconnect the door lock control switch connector.
CHECK:
Check continuity between terminals 4 (3), 3 (2), 1, 2 (4) of door
lock control switch connector, when door lock control switch is
pressed to the lock side, and unlock side and not pressed.
OK:
Switch positionTerminal
Lock side4 (3) - 1, 2 (4)
Unlock side3 (2) - 1, 2 (4)
OFF-
HINT:
The terminal number without brackets is for the LH, the number
with brackets is for the RH.
NG Replace door lock control switch.
OK
3 Check harness and connectors between ECU and door lock control switch,
switch and body ground (See page IN-26).
NG Repair or replace harness or connector.
OK
Check and replace ECU. *1
*1: Malfunction of the ECU can be considered possible only when the problem symptom is the following:

Lock and/or unlock using the Door Lock Control Switch cannot be done, neither on the driver's side
nor on the passenger's side.

N12884
Theft Deterrent ECU
Door Key Lock and Unlock Switch
Driver's
J6
JUNCTION
CONNECTORID110
W-B
AID1
D6 (10)
T4 22
LOCK
UNLOCK
AA W-B
W-B
J3
JUNCTION
CONNECTOR2R-Y9
IH111
IH110 ID18
IH1 12
A
ALOCK
UNLOCK Door Key Lock and Unlock Switch
Passenger's
(G-Y) R-W
G-W
R-WW-LW-L
(R-W) W-G
(R-Y)
D6(9)
T46
D6 (11)
T4 16L2
(L1)
UL3
UL2
(UL1) W-G 3
1
3
1 2
IE
( ): w/o Theft Deterrent System W-B
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-209
1996 TERCEL (RM440U)
Door Key Lock and Unlock Switch Circuit
CIRCUIT DESCRIPTION
The door key lock and unlock switch is built in the door key cylinder. When the key is turned to the lock side,
terminal 3 of the switch is grounded and when the key is turned to the unlock side, terminal 1 of the switch
is grounded.
WIRING DIAGRAM
DI4MV-02

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.