1996 TOYOTA T100 engine

Downloaded from www.Manualslib.com manuals search engine W05583R14301H00326
Center Airbag
Sensor Assembly
Spiral
CableD Squib
D+
(−) (+)
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−377
1996 TOYOTA T100 (RM449U)
6 Check spiral cable.
PREPARATION:
Disconnect connector between center airbag sensor assembly
and spiral cable.
CHECK:
For connector on spiral cable side between spiral cable and
steering wheel pad, measure resistance between D+ and body
ground.
OK:
Resistance: 1MΩ or higher
NG Repair or replace spiral cable.
OK
Repair or replace harness or connector
between center airbag sensor assembly and
spiral cable.

Downloaded from www.Manualslib.com manuals search engine AB0034
+A
+S
−S−A
DI−378
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
7 Check front airbag sensor.
PREPARATION:
Disconnect front airbag sensor connector.
CHECK:
Measure resistance between each terminal of front airbag
sensor.
OK:
TerminalResistance
+S − +ALess than 1 Ω
+S − −S1 MΩ or higher
−S − −A755 − 855 Ω
NOTICE:
Do not press ohmmeter probes too strongly against
terminals of front airbag sensor.
Make sure front airbag sensor connector is properly
connected.
NG Replace front airbag sensor.
OK
Repair or replace harness or connector
between center airbag sensor assembly and
front airbag sensor.

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−379
1996 TOYOTA T100 (RM449U)
DTC 12 Short in Squib Circuit or Front Airbag
Sensor 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.
The front airbag sensor detects the deceleration force in a frontal collision and is located in the front fender
on the left and right sides.
For details of the function of each components, see page OPERATION on page RS−2.
DTC 12 is recorded when a B+ short is detected in the squib circuit or front airbag sensor circuit.
DTC No.DTC Detecting ConditionTrouble Area
12
Short circuit in squib wire harness (to B+)
Squib malfunction
Short circuit in front airbag sensor +S wire harness (to B+)
Open circuit in RH and LH front airbag sensor harness
Spiral cable malfunction
Center airbag sensor assembly malfunctionSteering wheel pad (D squib)
Front airbag sensor
Spiral cable
Center airbag sensor assembly
Wire harness
WIRING DIAGRAM
See page DI−373.
DI986−01

Downloaded from www.Manualslib.com manuals search engine H18109
Center Airbag
Sensor Assembly
(−) (+)
+SL
+SR ON
DI−380
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Preparation (See step 1 on page DI−396)
2 Check D squib circuit (Measure voltage between terminals D+ or D− of center air-
bag sensor assembly connector and body ground.).
PREPARATION:
(a) Connect negative (−) terminal cable to battery.
(b) Turn ignition switch to ON.
CHECK:
Measure voltage between terminals D+ or D− of harness side
connector of center airbag sensor assembly and body ground.
OK:
Voltage: 0 V
NG Go to step 5.
OK

Downloaded from www.Manualslib.com manuals search engine W05582AB0118AB0119AB0069S08098W02043H00329
Center Airbag
Sensor Assembly
Spiral
Cable
ACC ON
D−D+
or
DLC1
E1Code 12
TcD Squib
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−381
1996 TOYOTA T100 (RM449U)
3 Check center airbag sensor assembly.
PREPARATION:
(a) Turn ignition switch LOCK.
(b) Disconnect negative (−) terminal cable from battery.
(c) Connect connector to center airbag sensor assembly.
(d) Using a service wire, connect D+ and D− on spiral cable
side of connector between spiral cable and steering
wheel pad.
(e) 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−365).
(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 center airbag sensor assembly.
OK

Downloaded from www.Manualslib.com manuals search engine AB0118 AB0119
S08098W02043
H00352
H00330
Center Airbag
Sensor Assembly
Spiral
CableD Squib
ACC ON
or
DLC1
E1
Tc
Code 12
DI−382
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
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−365).
(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
From results of above inspection, malfunctioning part can now be considered normal.
To make sure of this, use simulation method to check.

Downloaded from www.Manualslib.com manuals search engine W05583AB0119R14288H00331
Center Airbag
Sensor Assembly
Spiral
CableD Squib
ON
D+
(−) (+)
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−383
1996 TOYOTA T100 (RM449U)
5 Check D squib circuit.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect connector between center airbag sensor as-
sembly and spiral cable.
(c) Turn ignition switch ON.
CHECK:
For connector on spiral cable side between spiral cable and
steering wheel pad, measure voltage between D+ and body
ground.
OK:
Voltage: 0 V
NG Repair or replace spiral cable.
OK
Repair or replace harness or connector between center airbag sensor assembly and spiral cable.

Downloaded from www.Manualslib.com manuals search engine AB0119
R14288H01000
H01133
D Squib
Spiral
CableAirbag
Sensor
Assembly
←
ON
D+
(+) (−)→
DI−384
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
6 Check spiral cable.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect connector between center airbag sensor as-
sembly and spiral cable.
(c) Turn ignition switch ON.
CHECK:
Measure voltage at D+, D− on spiral cable side of connector be-
tween spiral cable and steering wheel pad.
OK:
Voltage: 0 V
NG Repair or replace 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.