TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine AB0118AB0119S08098W02044
H00352
H00339
Center Airbag
Sensor Assembly
D Squib
Spiral
Cable
ACC ON
or
DLC1
E1
Tc
Code 14
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−387
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 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 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 H18112
Center Airbag
Sensor Assembly
Spiral
CableD Squib
D−
D+
(−) (+)
DI−388
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
5 Check harness between center airbag sensor assembly and spiral cable.
PREPARATION:
Using a service wire, connect D+ and D− on center airbag sen-
sor assembly side connector.
CHECK:
For the connector (on the center airbag sensor assembly side)
between the center airbag sensor assembly and spiral cable,
measure the resistance between D+ and D−.
OK:
OK:
Resistance: Below 1 Ω
NG Repair or replace harness or connector be-
tween center airbag sensor assembly and spiral
cable.
OK
6 Check spiral cable.
NG Repair or replace spiral cable.
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 AB0118
R13006AB0069
AB0119W02044
H01002
H01140
D Squib
Spiral
CableAirbag
Sensor
Assembly
ON
D+
DLC1 DTC 14ACC
or D−
Tc E1
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−389
1996 TOYOTA T100 (RM449U)
7 Check center airbag sensor assembly.
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 E
1 of DLC1.
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 center airbag sensor 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.

Downloaded from www.Manualslib.com manuals search engine DI−390
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 15 Open in Front Airbag Sensor Circuit
CIRCUIT DESCRIPTION
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 component, see OPERATION on page RS−2.
DTC 15 is recorded when an open is detected in the front airbag sensor circuit.
NOTICE:
The front airbag sensor connector is equipped with an electrical connection check mechanism for
the purpose of detecting an open in the front airbag sensor (See page RS−2). This mechanism is
constructed so that when the terminals of the front airbag sensor have been connected (when the
connector housing lock is in the locked condition), the connection detection pin on the wire harness
side connects with the terminals for diagnosis use on the sensor side. If the connector is not properly
connected, the diagnosis system may detect only a malfunction code, even through the SRS is func-
tioning normally. When connecting the front airbag sensor connector, make sure it is connected
properly. If DTC 15 is displayed after the front airbag sensor connector has been connected, check
again that it is properly connected.
DTC No.DTC Detecting ConditionTrouble Area
15
Open cirxuit in +S wire harness or −S wire harness of front
airbag sensor.
Front airbag sensor malfunction.
Malfunction of electrical connection check mechanism of
front airbag sensor
Center airbag sensor assembly malfunction.
Front airbag sensor
Center airbag sensor
Wire harness
WIRING DIAGRAM
See page DI−373.
INSPECTION PROCEDURE
1 Preparaiton (See step 1 on page DI−396)
2 Check front airbag sensor circuit (Measure resistance between terminals +SR
and +SL of center airbag sensor assembly connector and body ground.) (See
step 2 on page DI−373).
NG Go to step 8.
OK
DI0XV−02

Downloaded from www.Manualslib.com manuals search engine H18109
ONAirbag Sensor Assembly
+SR
(−)−SR
(+)
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−391
1996 TOYOTA T100 (RM449U)
3 Check front airbag sensor circuit (Measure voltage between terminals +SR, +SL
of center airbag sensor assembly connector and body ground.).
PREPARATION:
(a) Connect negative (−) terminal cable to the battery, and
wait at least 2 seconds.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals +SR and body ground,
+SL and body ground of harness side connector of center air-
bag sensor assembly.
OK:
Voltage: 0 V
NG Repair or replace wire harness.
OK

Downloaded from www.Manualslib.com manuals search engine AB0118AB0119S08098H00316
H00350
H00340
Center Airbag
Sensor Assembly
D Squib
Spiral
Cable
ACC ON
or
DLC1
E1
Tc
Code 15
DI−392
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
4 Check center airbag sensor assembly.
PREPARATION:
(a) Connect center airbag assembly connector.
(b) 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 15 is not output.
HINT:
Codes other than code 15 may be output at this time, but they
are not relevant to this check.
NG Replace center airbag sensor assembly.
OK
From results of above inspection, malfunction part can now be considered normal.
To make sure of this, use simulation method to check.
5 Check connection of center airbag sensor assembly connector.
NG Repair.
OK

Downloaded from www.Manualslib.com manuals search engine H18113
Center Airbag Sensor Assembly
(−)(+) +SL +SR
1
Front Airbag Sensor
+SR
+SL
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−393
1996 TOYOTA T100 (RM449U)
6 Check front airbag sensor (See step 6 on page DI−373).
NG Replace front airbag sensor.
OK
7 Check harness between center airbag sensor assembly and front airbag sensor.
PREPARATION:
(a) Disconnect center airbag sensor assembly connector.
(b) Using service wires, connect +SR, +SL and body ground
on the wire harness side of the center airbag sensor as-
sembly.
CHECK:
Measure resistance between terminal +SR, +SL and body
ground of front airbag sensor connector.
OK:
Resistance: Less than 1 Ω
NOTICE:
Lightly touch ohmmeter probes at position shown in il-
lustration.
NG Repair or replace wire harness.
OK
8 Check front airbag sensor circuit (Measure voltage between terminals +SR, +SL
of center airbag sensor assembly connector and body ground.) (See step 3).
NG Repair or replace wire harness.
OK
From results of above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

Downloaded from www.Manualslib.com manuals search engine H18114
Center Airbag
Sensor Assembly ON
ACC
IG2
(−)
(+)
DI−394
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 31 Center Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The center airbag sensor assembly consists of a center airbag sensor, safing sensor, drive circuit, diagnosis
circuit and ignition control, etc.
It receives signals from the airbag sensors, judges whether or not the SRS must be activated, and diagnosis
system malfunction.
DTC 31 is recorded when occurrence of a malfunction in the center airbag sensor assembly is detected.
DTC No.DTC Detecting ConditionTrouble Area
31Center airbag sensor assembly malfunctionCenter 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−396)
2 Check voltage at IG2 and ACC of center airbag sensor assembly.
PREPARATION:
(a) Disconnect center airbag sensor assembly connector.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals IG2 and ACC of center air-
bag sensor assembly and body ground.
OK:
Voltage: Below 16 V
NG Check battery and charging system.
(3RZ−FE: See page CH−2)
(5VZ−FE: See page CH−1)
OK
DI0XW−02

Downloaded from www.Manualslib.com manuals search engine AB0118AB0119S08098FI1394H00342
ACC ON
or
DLC1
E1
Tc
Code 31
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−395
1996 TOYOTA T100 (RM449U)
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 steps (a) and (b) at least 5 times.
(d) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843−18020
(e) Check the DTC.
NO Using simulation method, reproduce malfunc-
tion symptoms (See page IN−16).
YES
Replace center airbag sensor assembly.

Downloaded from www.Manualslib.com manuals search engine R15204
J/B No.1
Center Airbag
Sensor Assembly Ignition
SwitchShort
Connector Integration
Relay
R/B No.2
BatteryGR−RGR−R
B−YB−YACC
IG2
R−L
B−R L−R
CIG
IGN
ALT
AM1
AM2
WW
W
W
W−R
1A
1A 1CIA3
IA3
W−R34
34
16
15
17 3 4
7 2
83 14
8 2
2
2 2 2 26
4
2 5
13 DI−396
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage−increase circuit (DC−DC converter) in the center airbag sensor assem-
bly 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 center airbag sensor assembly, and the source voltage re-
turns to normal, after approx. 10 seconds the SRS warning light automatically goes off.
DTC No.Diagnosis
(Normal)Source voltage drop
WIRING DIAGRAM
DI989−01