1996 TOYOTA TERCEL Service Repair Manual

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

BE3843N14685I09779
TAIL (-)
(+)
Disconnect
DI-236
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the taillights light up normally whenever the light control
switch is operated. If taillight operation is not normal when the light control switch is operated, proceed to
troubleshooting on page BE-2.
1 Check voltage between terminal TAIL of theft deterrent ECU connector and body
ground.
PREPARATION:
Disconnect the theft deterrent ECU connector.
CHECK:
Measure voltage between terminal TAIL 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 taillight control relay.

N20823
BatteryMAIN FL2
F61
F7B-R B
Fusible Link
Block2
EA2B-R 2 2AM1
W-G 2 1
1B
1J W-G2Ignition Switch
3
B-Y4
1BCIG & RAD1
1DGRTheft Deterrent ECU
8
T3
ACC
I10Instrument Panel
Junction Block
Instrument Panel
Junction BlockACC
AM1
ALT
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-237
1996 TERCEL (RM440U)
Ignition Switch Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU. Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to the
terminals ACC and IG of the ECU. When the battery positive voltage is applied to the terminal ACC of the
ECU while the theft deterrent system is activated, the warning stops. Furthermore, power supplied from the
terminals ACC and IG of the ECU is used as power for the door courtesy switch, and position switch, etc.
WIRING DIAGRAM
DI4NA-02

N12877N14677I09780
Instrument Panel Junction Block
CIG & RAD
BE4061I05896I09781
ON
IG
(+) (-)
Disconnect
DI-238
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check CIG / RAD fuses.
PREPARATION:
(a) Remove the fuse box cover.
(b) Remove CIG & RAD fuse from instrument panel junction
block.
CHECK:
Check continuity of CIG & RAD fuses.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the CIG & RAD fuse (See at-
tached wiring diagram).
OK
2 Check voltage between terminals ACC of theft deterrent ECU and body ground.
PREPARATION:
(a) Disconnect the theft deterrent ECU connectors.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals ACC of theft deterrent
ECU connector and body ground.
OK:
Voltage: 10 - 14 V
OK Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between theft deterrent ECU and battery
(See page IN-26).

N12894
L3 Luggage Compartment
Door Courtesy Switch 1R-YIE210
R-YT44 Theft Deterrent ECU
DSWL
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-239
1996 TERCEL (RM440U)
Luggage Compartment Door Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The luggage compartment door courtesy switch goes on when the luggage compartment door is opened
and goes off when the luggage compartment door is closed.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of luggage compartment door courtesy light.
CHECK:
Check that luggage compartment door courtesy light goes off when luggage compartment door courtesy
switch is pushed, and comes on when switch is not pushed.
NG Check and repair luggage compartment door
courtesy light circuit (See page BE-24).
OK
DI4NB-02

DI-240
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1996 TERCEL (RM440U)
2 Check for open in harness and connector between theft deterrent ECU and lug-
gage compartment door courtesy switch (See page IN-26).
NG Repair or replace harness or connectors.
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).

N12895
BG BH
W-B W-B 1Luggage Compartment
Door Key Lock and Unlock SwitchL4
2
LIE29
LT49
LUG Theft Deterrent ECU
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-241
1996 TERCEL (RM440U)
Luggage Compartment Door Key Lock and Unlock Switch
Circuit
CIRCUIT DESCRIPTION
The luggage compartment door key lock and unlock switch goes on when the luggage compartment door
key cylinder is turned to the unlock side with the key.
WIRING DIAGRAM
DI4NC-01