TOYOTA TERCEL 1996 Service Repair Manual

DI4MQ-01
DI-196
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
PROBLEM SYMPTOMS TABLE
Perform troubleshooting of the circuits for the applicable problem symptom in the order given in the chart
below.
Proceed to the page given for each circuit.
HINT:

If the instruction ºProceed to next circuit inspection shown on matrix chartº is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue the check.


If the trouble still reappears even through there are no abnormalities in any of the other circuits, then
check and replace the Theft Deterrent and Door Lock Control ECU (Door Lock Control Relay) as the
last step.
SymptomSuspect AreaSee page
No functions of the door lock control system operate.
1. ECU power source circuit.*
2. Actuator power source circuits.
3. Door lock motor circuit.
4. Theft deterrent ECU or door lock control relay.DI-197
DI-200
DI-203
IN-26
All doors or some doors are not locked and unlocked with the
door lock control switch and door key lock and unlock switch.1. Door lock motor circuit.
2. Theft deterrent ECU or door lock control relay.DI-203
IN-26
Doors cannot be locked or unlocked with the door lock control
switch. (Doors lock and unlock normally with the door key lock
and unlock switch).1. Door lock control switch circuit.
2. Theft deterrent ECU or door lock control relay.DI-206
IN-26
Doors are not locked or unlocked with the key operated switch.
(Doors lock and unlock normally with the door lock control
switch.)1. Door key lock and unlock switch circuit.
2. Theft deterrent ECU or door lock control relay.DI-209
IN-26
Key confinement prevention function does not operate.
1. Key unlock warning switch circuit.
2. Door unlock detection switch circuit.
3. Theft deterrent ECU or door lock control relay.DI-21 1
DI-213
IN-26
*: w/ Theft Deterrent System

DI4MR-02
N20816
BatteryEngine Room
Relay BlockInstrument Panel
Junction BlockTheft Deterrent ECU
+B1
T41
1D8
1K11
L-Y L-Y
2
MAIN FL
EA2BDOME 1
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-197
1996 TERCEL (RM440U)
CIRCUIT INSPECTION
ECU Power Source Circuit (w / Theft deterrent System)
CIRCUIT DESCRIPTION
This circuit provides power to operate the theft deterrent and door lock ECU.
WIRING DIAGRAM

N12865DOME Fuse

Engine Room Relay Block
I05884
(+)
(-)E +B1
OFF
DI-198
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check DOME fuse.
PREPARATION:
Remove DOME fuse from engine room relay block.
CHECK:
Check continuity of DOME fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the DOME fuse
(See attached wiring diagram).
OK
2 Check voltage between terminals +B1 and E of ECU connector.
PREPARATION:
Disconnect the theft deterrent and door lock ECU connectors.
CHECK:
Measure voltage between terminals +B1 and E of ECU connec-
tor.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-196).
NG

- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-199
1996 TERCEL (RM440U)
3 Check for open in harness and connector between ECU and body ground
(See page IN-26).
NG Repair or replace harness or connector.
OK
Check and repair harness connector be-
tween ECU and battery.

N20817
BatteryInstrument Panel
Junction BlockTheft Deterrent ECU
(Door Lock Control Relay)
1J2
W-G
MAIN FLEA2
F7 F6 221A3
D6 (8)
T39
D6 (16)
T34
A A
IEJ3
JUNCTION
CONNECTOR A
AW-B
ALT AM1POWER
2 1L
W-B B W-G
( ): w/o Theft Deterrent System+B2
(B)
E
B-R B-R2JUNCTION
CONNECTOR J6
J/B No.2
11J/B No.7 DI-200
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
Actuator Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to drive the door lock motor.
WIRING DIAGRAM
DI4MS-01

N13109
 Relay Block No.7
POWER M-Fuse
1
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-201
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check POWER M-fuse.
PREPARATION:
(a) Remove the finish low center panel.
(b) Remove the POWER M-fuse from R/B No.7.
CHECK:
Check continuity of POWER M-fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the POWER M-fuse
(See attached wiring diagram). *1
OK

BE3843N14666N15243I09768
Disconnect
w/ Theft Deterrent System
 w/o Theft Deterrent System
B (-)
(+)
(-)
(+)
+B2
DI-202
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
2 Check voltage between terminal +B2 (B) of ECU connector and body ground.
PREPARATION:
Disconnect the theft deterrent and door lock ECU connector.
CHECK:
Measure voltage between terminal +B2 (B) of ECU connector
and body ground.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-196).
NG
Check and repair harness and connectors
between ECU and battery
(See page DI-196).
*1: The power source is supplied to the actuator (door lock motor) through the theft deterrent and door lock
ECU. If a short circuit of the W/H or actuator occurs in the actuator circuit, the POWER M-fuse may become
OPEN, so also inspect the actuator (door lock motor circuit on page DI-203).

N12882
ID1
IH1
BJ1
BK1Theft Deterrent ECU
(Door Lock Control Relay)
( ): w/o Theft Deterrent System JUNCTION
CONNECTOR B R
GC
8 IE8 5 4
4 2T3 D63 (4)
T3 D62 (3) J6
JUNCTION
CONNECTOR
C
GG
G
G
GG
G
GC
CACT+
ACT-
B
BID2
IH1
BJ1
BK1 5 4
4 2 Door Lock Motor
Driver's
Rear Left Passenger's
Rear Right R
R
RR
R
R
R IE1
14
R 7
9
2
21
8
6
6
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-203
1996 TERCEL (RM440U)
Door Lock Motor Circuit
CIRCUIT DESCRIPTION
This door lock motor locks and unlocks the door in accordance with signals from the ECU.
WIRING DIAGRAM
DI4MT-02

BE5691
I05886
(-) (+)
(-) (+)
(-) (+) (-) (+) (a) (b)
(a) (b) Front Door
Rear Door54
4
2
54
42
DI-204
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check operating sound of door lock motor.
CHECK:
Check operating sound of door lock motor, when door lock con-
trol switch is pushed to the lock side and unlock side.
OK:
Can hear operating sound of door lock motor.
HINT:
Inspect the door which is malfunctioning.
OK Repair or replace door lock control link.
NG
2 Check door lock motor.
PREPARATION:
(a) Remove the door trim and service hold cover.
(b) Disconnect the door lock motor connector.
CHECK:
(a) Connect positive
lead to terminal 5 (4) and negative 
lead to terminal 4 (2) of door lock motor connector.
(b) Connect positive
lead to terminal 4 (2) and negative 
lead to terminal 5 (4) of door lock motor connector.
( ): Rear Door
OK:
(1) Door lock motor locks door.
(2) Door lock motor unlocks door.
HINT:
This inspection must be carried out within 2 seconds.
OK Replace door lock motor.
NG

- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-205
1996 TERCEL (RM440U)
3 Check harness and connectors between ECU and door lock motor
(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).