1996 TOYOTA TERCEL Service Repair Manual

R05896
AB0118
R13006AB0119
W02044H00018
Airbag Sensor
Assembly
Spiral
Cable P Squib
D Squib
ACCON
or
DLC1
E1
TcCode 14
DI-170
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
4 Check D squib.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c) Connect steering wheel pad connector.
(d) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(b) Clear malfunction code stored in memory (See page
DI-148).
(c) Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(e) Using SST, connect terminals Tc and E1 of DLC 1.
SST 09843-18020
(f) Check DTC.
OK:
DTC 14 is not output.
HINT:
Codes other than code 14 may be output at this time, but they
are not relevant to this check.
NG Replace steering wheel pad.
OK
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.

R05899
R14286H00019
P Squib
D+
D-Airbag Sensor
Assembly
Spiral
Cable
D Squib
R14286R12688H00232
D- D+ P SquibAirbag Sensor
Assembly
Spiral
Cable
D SquibD+ D-
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-171
1996 TERCEL (RM440U)
5 Check spiral cable.
PREPARATION:
Disconnect connector between airbag sensor assembly and
spiral cable.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D
+ and D-.
OK:
OK:
Resistance: Below 1 W
NG Repair or replace spiral cable.
OK
6 Check harness between airbag sensor assembly and spiral cable.
PREPARATION:
Using a service wire, connect D+ and D- on airbag sensor as-
sembly connector.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and spiral cable, measure
the resistance between D
+ and D-.
OK:
Resistance: Below 1 W
NG Repair or replace harness or connector be-
tween airbag sensor assembly and spiral cable.
OK
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.

R14285 AB0119H00021
Airbag Sensor Assembly ON
IG2 ACC
(+) (-)
DI-172
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
DTC 31 Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The airbag sensor assembly consists of a airbag sensor, safing sensor, drive circuit, diagnosis circuit and
ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the SRS must be activated, and diagnostic
system malfunction.
DTC 31 is recorded when occurrence of a malfunction in the airbag sensor assembly is detected.
DTC No.DTC Detection ConditionTrouble Area
31
Airbag sensor assembly malfunction
Airbag sensor assembly
INSPECTION PROCEDURE
HINT:
When a malfunction code other than code 31 is displayed at the same time, first repair the malfunction indi-
cated by the malfunction code other than code 31.
1 Preparation (See step 1 on page DI-177)
2 Check voltage at IG2 and ACC of airbag sensor assembly.
PREPARATION:
(a) Connect negative (-) terminal cable to battery.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals IG2 and ACC of airbag
sensor assembly and body ground.
OK:
Voltage: Below 16 V
NG Check battery and charging system (See page
CH-2).
OK
DI4MF-02

AB0118
R13006AB0119
FI1394
H00022
ACCON
or
DLC1
E1
TcCode 31
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-173
1996 TERCEL (RM440U)
3 Is DTC 31 output again?
PREPARATION:
Clear malfunction code.
CHECK:
(a) Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(b) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(c) Repeat operation in step (a) and (b) at least 5 times.
(d) Using SST, connect terminals Tc and E1 of DLC 1.
SST 09843-18020
(e) Check DTC.
NO Using simulation method, reproduce malfunc-
tion symptoms (See page IN-16).
YES
Replace airbag sensor assembly.

R14286R12689R14725H08146
P+
P-
Airbag Sensor
Assembly P Squib
D SquibSpiral
CableP-
P+
DI-174
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
DTC 54 Open in P Squib Circuit
CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly. It causes
the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each components, see FUNCTION OF COMPONENTS on page RS-2.
DTC 54 is recorded when an open is detected in the P squib circuit.
DTC No.DTC Detection ConditionTrouble Area
54

Open circuit in P+ wire harness or P- wire harness of
squib

P squib malfunction

Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib)

Airbag sensor assembly

Wire harness
WIRING DIAGRAM
Refer to page DI-155 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Preparation (See step 1 on page DI-177)
2 Check P squib circuit.
PREPARATION:
Using a service wire, connect P+
and P- on airbag sensor as-
sembly connector.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and front passenger airbag
assembly measure the resistance between P
+ and P-.
OK:
Resistance: Below 1 W
NG Repair or replace harness or connector be-
tween airbag sensor assembly and front pas-
senger airbag assembly.
OK
DI4MH-02

AB0069
AB0118
R13006W01934
AB0119
W02045
H00024
P+
P-
Airbag Sensor
Assembly
P Squib
D SquibSpiral
Cable
ACCON
or
DLC1
E
1TcCode 54
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-175
1996 TERCEL (RM440U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect connector to airbag sensor assembly.
(b) Using a service wire, connect P
+ and P- on airbag sensor
assembly side of connector between airbag sensor as-
sembly and front passenger airbag assembly.
(c) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn ignition switch to ACC or ON and wait at least 20 se-
conds.
(b) Clear malfunction code stored in memory (See page
DI-148).
(c) Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(e) Using SST, connect terminal Tc and E1 of DLC1.
SST 09843-18020
(f) Check DTC.
OK:
DTC 54 is not output.
HINT:
Codes other than code 54 may be output at this time, but they
are not relevant to this check.
NG Replace airbag sensor assembly.
OK

R05909
AB0118
R13006AB0119
W02045H00025
Airbag Sensor
Assembly
P Squib
D SquibSpiral
Cable
ACCON
or
DLC1
E
1TcCode 54
DI-176
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
4 Check P squib.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c) Connect front passenger airbag assembly connector.
(d) Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn ignition switch to ACC or ON and wait at least 20 se-
conds.
(b) Clear malfunction code stored in memory (See page
DI-148).
(c) Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(e) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843-18020
(f) Check DTC.
OK:
DTC 54 is not output.
HINT:
Codes other than code 54 may be output at this time, but they
are not relevant to this check.
NG Replace front passenger airbag assembly.
OK
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.

H09396
MAIN
FL
B
ALT
B-RB-R
2 2
Engine
Room
R/B
AM1
W-GDriver Side J/B
1
1J
1BW-G 2ACC
AM13
B-Y4
1B
1H
CIG/RADIO Driver Side J/B
G-R*1
10
ACCAirbag
Sensor
Assembly
8
*2
B-OIG2 *1
9
7
*2 2
1H 1B5
IGN B-W 6
AM2
Ignition
Switch 7 B-R 12
IC1 B-R
2
AM2
EA2 1
B*1: USA
*2: CANADA EA214
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-177
1996 TERCEL (RM440U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different to other circuits-when the SRS warning
light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.DTC Detection ConditionTrouble Area
(Normal)Source voltage drop.
Battery

Airbag sensor assembly
WIRING DIAGRAM
DI4MI-02