1996 TOYOTA TERCEL warning

R15077
Airbag Sensor
Assembly
4
IK*1 2
Tc DLC1
E18
AA
BR
EA1Driver Side J/B
311P-B BR
ECJunction
ConnectorP-B P-B
IF
Tc
(w/ Front Passenger Airbag)
*1: Tc - 7
(w/o Front Passenger Airbag)
*1: Tc - 5
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-185
1996 TERCEL (RM440U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of the DLC1 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by the blinking of the SRS warning light.
WIRING DIAGRAM
DI4ML-02

AB0117 AB0118 AB0119H00270
LOCKACCON
or
AB0118
R14305AB0119
H00030
ACCON
or
E1
Tc
(+) (-)DLC1
DI-186
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
HINT:
If the DTC is not displayed, do the following troubleshooting.
1 Does SRS warning light up for approx. 6 seconds?
CHECK:
Check operation of SRS warning light after ignition switch is
turned from LOCK position to ACC or ON position.
NO Check SRS warning light system.
(See page DI-180, DI-182)
YES
2 Check voltage between terminals Tc and E1 of DLC1.
PREPARATION:
Turn ignition switch to ACC or ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC1.
OK:
Voltage: 10 - 14 V
OK Go to step 4.
NG

AB0117 AB0118 AB0119
R12658H00032
LOCK
ACC
ON
or
Airbag Sensor Assembly
Tc
DI-188
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
4 Check airbag sensor assembly.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c) Remove steering wheel pad (See page SR-13).
(d) Disconnect connector of front passenger airbag assem-
bly (See page RS-21).
(e) Disconnect connector of airbag sensor assembly
(See page RS-33)
(f) Insert service wire into terminal Tc from back side as
shown.
(g) Connect airbag sensor assembly connector with service
wire.
(h) Connect negative (-) terminal cable to battery.
(i) Turn ignition switch to ACC or ON and wait at least 20 se-
conds.
(j) Connect service wire of terminal Tc to body ground.
CHECK:
Check operation of SRS warning light.
OK:
SRS waning light comes on.
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
OK Check harness between airbag sensor assem-
bly and DLC1.
NG
Replace airbag sensor assembly.

DI4MO-01
I05900
Door Lock Control Relay or
Theft Deterrent ECUIgnition Switch

Key Unlock Warning Switch
J/B No.7

POWER Fuse
Door Lock Control Switch
Door Key Lock and Unlock Switches
Engine Room R/B

DOME Fuse
Door Lock Assembly

Door Lock Motor

Door Unlock Detection SwitchDoor Courtesy Switches
Door Lock Assembly

Door Lock Motor

Door Unlock Detection Switch
Door Lock Assembly

Door Lock Motor

Door Unlock
Detection Switch
Door Courtesy Switches DI-192
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)
PARTS LOCATION

DI-194
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
1996 TERCEL (RM440U)Terminals
SymbolsConditionSTD Value
B14A4DSWH EEngine hood courtesy switch ºONº.Below 1 WB14 e A4DSWH - EEngine hood courtesy switch ºOFFº.1 MW or higher
B15A4LSWD EDoor unlock detection switch ºONº . (Driver's)Below 1 WB15 e A4LSWD - EDoor unlock detection switch ºOFFº. (Driver's)1 MW or higher
B16A4UL2 E
Door key lock and unlock switch ºUNLOCKº.
(Passenger's)Below 1 W
B16 e A4UL2 - EDoor key lock and unlock switch ºOFFº or ºLOCKº.
(Passenger's)1 MW or higher
B19A4DSWP EDoor courtesy switch ºONº. (Passenger's)Below 1 WB19 e A4DSWP - EDoor courtesy switch ºOFFº. (Passenger's)1 MW or higher
B20 e A4KSW - E
Key unlock warning switch ºONº.
(Key is inserted into key cylinder)Below 1 WB20 e A4KSW E
Key unlock warning switch ºOFFº.1 MW or higher
B21A4LSWP EDoor unlock detection switch ºONº . (Passenger's)Below 1 WB21 e A4LSWP - EDoor unlock detection switch ºOFFº. (Passenger's)1 MW or higher
B22A4L2 E
Door key lock and unlock switch ºLOCKº.
(Driver's)Below 1 W
B22 e A4L2 - EDoor key lock and unlock switch ºOFFº or ºUNLOCKº.
(Driver's)1 MW or higher
B23 e A4TAIL - ELight control switch ºOFFº.10 - 14 V
B24 e A4HORN - EHorn switch ºOFFº.10 - 14 V
B25 e A4SRLY - EIgnition switch is turned to ºSTº.
(when park / neutral position switch ºPº position)10 - 14 V

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

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).