light TOYOTA TERCEL 1996 Service Workshop Manual

H00003
ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-179
1996 TERCEL (RM440U)
3 Does SRS warning light turn off?
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Connect steering wheel pad connector.
(c) Connect front passenger airbag assembly connector.
(d) Connect airbag sensor assembly connector.
(e) Turn ignition switch ON.
CHECK:
Operate electric system checked in defogger, wiper, headlight,
heater blower, etc. and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, perform trou-
bleshooting for the DTC. If a normal code is out-
put, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

R15076
F6
B
EA2 B-R
MAIN
FL
Battery ALT13 Driver Side J/B
SRS
1J
F7 12
B-R1
1E
4 8 5
Tc LA B-Y R-G
*1
12 1F
1F
1F
1F 1KSRS Warning Light
45
B-Y
*2
AB DLC1
11 P-B
P-B P-BEA1Tc
(w/ Front Passenger Airbag)
*1: LA - 8
*2: Tc - 7
(w/o Front Passenger Airbag)
*1: LA - 6
*2: Tc - 5Airbag Sensor
Assembly
IG1
B-Y
B-Y4
7
5 DI-180
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
SRS Warning Light System Malfunction (Always lit up when igni-
tion switch is in LOCK position.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from the LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
DI4MJ-02

H00234
D squibP squibAirbag Sensor
Assembly
Spiral
Cable LOCK
AB0117
N12639
H00026
Airbag Sensor Assembly LOCK
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-181
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Preparation.
PREPARATION:
(a) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(b) Remove steering wheel pad (See page SR-13).
(c) Disconnect connector of front passenger airbag assem-
bly (See page RS-21).
CAUTION:
Store the steering wheel pad with the front surface facing
upward.
2 Does SRS warning light turn off?
PREPARATION:
(a) Disconnect airbag sensor assembly connector.
(b) Connect negative (-) terminal cable to battery.
CHECK:
Check operation of SRS warning light.
NO Check SRS warning light circuit or terminal AB
circuit of DLC1.
YES
Replace airbag sensor assembly.

N14677
Fuse
DI-182
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
SRS Warning Light System Malfunction (Does not light up when
ignition switch is turned to ACC or ON.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
Refer to page DI-180 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check SRS Fuse.
PREPARATION:
Remove SRS fuse.
CHECK:
Check continuity of SRS fuse.
OK:
Continuity
HINT:

Fuse may be burnt out even if it appears to be OK during
visual inspection.

If fuse is OK, install it.
NG Go to step 5.
OK
2 Preparation. (See step 1 on page DI-177)
DI4MK-02

AB0119
H00260
Airbag Sensor Assembly ON
LA
W01935
AB0119
H00269
Airbag Sensor
Assembly
P Squib
D SquibSpiral
Cable
ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-183
1996 TERCEL (RM440U)
3 Check SRS warning light circuit.
PREPARATION:
(a) Connect negative (-) terminal cable to battery.
(b) Turn ignition switch to ACC or ON.
CHECK:
Measure voltage LA terminal of harness side connector of air-
bag sensor assembly.
OK:
Voltage: 10 - 14 V
NG Check SRS warning light bulb / repair SRS
warning light circuit.
OK
4 Does SRS warning light come on?
PREPARATION:
(a) Disconnect negative (-) terminal cable from the battery.
(b) Connect airbag sensor assembly connector.
(c) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
(d) Turn ignition switch to ACC or ON.
CHECK:
Check operation of SRS warning light.
NO Check terminal LA of airbag sensor assembly.
If normal, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

DI-184
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
5 Is new SRS fuse burnt out again?
NO Using simulation method, reproduce malfunc-
tion symptoms (See page IN-16).
YES
Check harness between SRS fuse and SRS
warning light.

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.

DI4MP-02
I00302 I00303I00304Theft Deterrent and Door Lock Control ECU AB T3
T4
- DIAGNOSTICSPOWER DOOR LOCK CONTROL SYSTEM
DI-193
1996 TERCEL (RM440U)
TERMINALS OF ECM
w/ Theft Deterrent System
TerminalsSymbolsConditionSTD Value
A2 e A3ACT- - ACT+Ignition switch ºOFFº.Below 50 W
A4 e GroundE - GroundAlways.Below 1 W
A4 e A8E - ACCIgnition switch ºACCº.10 - 14 V
A9 e Ground+ B2 - GroundAlways.10 - 14 V
B1 e Ground+ B1 - GroundAlways.10 - 14 V
B2A4LSWR E
Door unlock detection switch ºONº.
(Rear door)Below 1 W
B2 e A4LSWR - EDoor unlock detection switch ºOFFº.
(Rear door)1 MW or higher
B3A4CTY E
Door courtesy switch ºONº.
(Except driver's door opened)Below 1 W
B3 e A4CTY - EDoor courtesy switch ºOFFº.
(Except driver's door closed)1 MW or higher
B4A4DSWL ELuggage compartment door courtesy switch ºONº.Below 1 WB4 e A4DSWL - ELuggage compartment door courtesy switch ºOFFº.1 MW or higher
B5A4L1 EDoor lock control switch ºLOCKº .Below 1 WB5 e A4L1 - EDoor lock control switch ºOFFº or ºUNLOCKº .1 MW or higher
B6A4UL3 E
Driver's door key lock and unlock switch
ºUNLOCKº.Below 1 W
B6 e A4UL3 - EDriver's door key lock and unlock switch
ºOFFº or ºLOCKº.1 MW or higher
B7A4DSWD E
Door courtesy switch ºONº.
(Driver's door opened)Below 1 W
B7 e A4DSWD - EDoor courtesy switch ºOFFº.
(Driver's door closed)1 MW or higher
B8A4UL1 EDoor lock control switch ºUNLOCKº .Below 1 WB8 e A4UL1 - EDoor lock control switch ºOFFº or ºLOCKº.1 MW or higher
B9A4LUG E
Luggage compartment door key lock
and unlock switch ºONº.Below 1 W
B9 e A4LUG - ELuggage compartment door key lock
and unlock switch ºOFFº.1 MW or higher
B10 e A4HEAD - ELight control switch other than ºHEADº.10 - 14 V
B11 e A4SH - EAlways.10 - 14 V
B12 e B1IND - +B1Indicator light ºONº.Below 1 W