ECU TOYOTA TERCEL 1996 Service Manual PDF

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).

N09348
ECUTOYOTA hand-held tester
TOYOTA Break-out-box
Interfece
Box DI-218
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
4. CANCELLING OF THE THEFT DETERRENT SYSTEM IN OPERATING CONDITION
The theft deterrent operation can be canceled when any of the following conditions is met:
No.ConditionCanceling Operation
1Unlock left or right door with the key.

2Unlock doors with wireless door lock control system.

3Insert key into ignition key cylinder and turn it to ACC or ON
position.

4About 1 minute passes after theft deterrent operation be-
gins.Automatic stop *1
*1: In this case the theft deterrent system resets after about 2 seconds if all doors are closed.
5. ECU TERMINAL VOLTAGE MEASUREMENT BY US-
ING TOYOTA BREAK- OUT- BOX AND TOYOTA
HAND-HELD TESTER
(a) Hook up the TOYOTA break- out- box and TOYOTA
hand-held tester to the vehicle.
(b) Read the ECU input/output values by following the
prompts on the tester screen. Please refer to the TOYO-
TA break-out-box operator's manual.
HINT:
TOYOTA hand-held tester has a ºSnapshotº function. This re-
cords the measured data and is effective in the diagnosis of in-
termittent problems.

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

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).