1996 TOYOTA TERCEL Service Repair Manual

AB0119
W01931
R14300
H00010
Airbag Sensor
Assembly
Spiral
Cable ON
P Squib
D Squib
D+
(+) (-)D-
DI-162
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
DTC 12 Short in Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-
ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each components, see FUNCTION OF COMPONENTS on page RS-2.
DTC 12 is recorded when a B+ short is detected in the squib circuit.
DTC No.DTC Detection ConditionTrouble Area
12

Short circuit in squib wire harness (to B+)

Squib malfunction

Spiral cable malfunction

Airbag sensor assembly malfunction
Steering wheel pad (D squib)

Front passenger airbag assembly (P squib)

Spiral cable

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 D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the voltage between
D
+, D- and body ground.
OK:
Voltage: 0 V
NG Go to step 7.
OK
DI4MC-02

R05898 AB0119
R14300H00011
ON
P+
(+) (-)
Airbag Sensor
Assembly
P Squib
D Squib
Spiral
CableP-
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-163
1996 TERCEL (RM440U)
3 Check P squib circuit.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween airbag sensor assembly and front passenger airbag as-
sembly, measure the voltage between P
+, P- and body ground.
OK:
Voltage: 0V
NG Repair or replace harness or connector be-
tween the airbag sensor assembly and front
passenger airbag assembly.
OK

AB0069
AB0069
AB0118
R13006AB0119W01933
W02043
H00012
Airbag Sensor
Assembly P+
P-
Spiral
Cable P Squib
D Squib
D-D+ACC ON
or
DLC1Code 12
E1Tc
DI-164
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
4 Check airbag sensor assembly.
PREPARATION:
(a) Connect connector to airbag sensor assembly.
(b) Using a service wire, connect D
+ and D- on spiral cable
side of connector between spiral cable and steering
wheel pad.
(c) 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.
(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 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
NG Replace airbag sensor assembly.
OK

R13006 R05896
AB0118 AB0019W02043H00013
Airbag Sensor
Assembly
P Squib
D Squib
Spiral
Cable
ACCON
or
DLC1Code 12
E1 Tc
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-165
1996 TERCEL (RM440U)
5 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 DLC1.
SST 09843-18020
(f) Check DTC.
OK:
DTC 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
NG Replace steering wheel pad.
OK

R05897
R13006 AB0118AB0119
W02043H00014
Airbag Sensor
Assembly
P Squib
D SquibSpiral
Cable
ACCON
or
DLC1Code 12
E1
Tc
DI-166
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
6 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 12 is not output.
HINT:
Codes other than code 12 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.

R05899
AB0119
R14288
H00015
Airbag Sensor
Assembly
P Squib
D SquibSpiral
Cable
D+
(+) (-)ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-167
1996 TERCEL (RM440U)
7 Check spiral cable.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect connector between airbag sensor assembly
and spiral cable.
(c) Turn ignition switch ON.
CHECK:
Measure voltage at D+ on spiral cable side of connector be-
tween spiral cable and steering wheel pad and body ground.
OK:
Voltage: 0 V
NG Repair or replace spiral cable.
OK
Repair or replace harness or connector between airbag sensor assembly and spiral cable.

H00231
Airbag Sensor
Assembly
Spiral
Cable P Squib
D Squib
D+ D-
D+ D-
DI-168
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
DTC 14 Open in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad. 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 14 is recorded when an open is detected in the D squib circuit.
DTC No.DTC Detection ConditionTrouble Area
14

Short circuit in D+ wire harness or D- wire harness of
squib

D squib malfunction

Spiral cable malfunction

Airbag sensor assembly malfunction
Steering wheel pad (D squib)

Spiral cable

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 D squib circuit.
PREPARATION:
Using a service wire, connect D+, and D- on airbag sensor as-
sembly connector.
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:
Resistance: Below 1 W
NG Go to step 5.
OK
DI4ME-02

R05895
AB0118
R13006AB0069
AB0119
W02044H00017
Airbag Sensor
Assembly
Spiral
Cable
D SquibP Squib
D+
D-ACCON
or
DLC1
E1 TcCode 14
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-169
1996 TERCEL (RM440U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect connector to airbag sensor assembly.
(b) Using a service wire, connect D
+ and D- on spiral cable
side of connector between spiral cable and steering
wheel pad.
(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 on 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 airbag sensor assembly.
OK