sensor TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine DI0XK−02
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−369
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit.).
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
Normal
(DI−396)System normal−OFF
Source voltage dropBattery
Center airbag sensor assemblyON
11
(DI−373)
Short in squib circuit or front airbag
sensor circuit (to ground)Steering wheel pad (D squib)
Front airbag sensor
Spiral cable
Center airbag sensor assembly
Wire harness
ON
12
(DI−379)
Short in squib circuit or front airbag
sensor circuit (to B+)Steering wheel pad (D squib)
Front airbag sensor
Spiral cable
Center airbag sensor assembly
Wire harness
ON
14
(DI−385)
Open in D squib circuitSteering wheel pad (D squib)
Spiral cable
Center airbag sensor assembly
Wire harness
ON
15
(DI−390)Open in front airbag sensor circuitFront airbag sensor
Center airbag sensor assembly
Wire harness
ON
31
(DI−394)
Center airbag sensor assembly
malfunctionCenter airbag sensor assembly
ON
HINT:
When the SRS warning light remains lit up and the DTC is the normal code, this means a source voltage
drop. This malfunction is not stored in memory by the center airbag sensor assembly and if the power
source voltage returns to normal, approx. 10 seconds the SRS warning light will automatically go out.
When 2 or more codes are indicated, the lowest numbered code will apper first.
If a code not listed on the chart is displayed, the center airbag sensor assembly is faulty.

Downloaded from www.Manualslib.com manuals search engine DI0XL−02
R12499
Front Airbag Sensor RH
Front Airbag Sensor LH
Junction Block No.1
Center Airbag Sensor Assembly Spiral CableSRS Warning Light
Steering Wheel Pad
(with Airbag)
DI−370
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
PARTS LOCATION

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W02759
43 21
10 9 8 7 56 B A
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−371
1996 TOYOTA T100 (RM449U)
TERMINALS OF ECU
No.SymbolTerminal Name
A−Electrical Connection Check Mechanism
B−Electrical Connection Check Mechanism
1LASRS Warning Light
2D−Squib  (Driver)
3D+Squib  (Driver)
4TCDiagnosis
5E2Ground
6E1Ground
7+SRFront Airbag Sensor RH 
8+SLFront Airbag Sensor LH 
9IG2Power Source (IGN Fuse)
10ACCPower Source (CIG Fuse)

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R15205
Center Airbag Sensor Assembly
Front Airbag Sensor RH
Front Airbag Sensor LH D Squib
Spiral
CableW−B
W−B +SR
+SLB
L B−L W
D+
D−1
2
1
2 13
14 1
27
6
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−373
1996 TOYOTA T100 (RM449U)
CIRCUIT INSPECTION
DTC 11 Short in Squib Circuit (to Ground)
CIRCUIT DESCRIPTION
The squib circuit consists of the center airbag sensor assembly, spiral cable and steering wheel pad. If
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
apron on the left and right sides.
For details of the function of each component, see OPERATION on page RS−2.
DTC 11 is recorded when ground short is detected in the squib circuit or front airbag sensor circuit.
DTC No.DTC Detecting ConditionTrouble Area
11
Short circuit in squib wire harness (to ground)
Squib malfunction
Short circuit in front airbag sensor +S wire harness
(to ground)
Front airbag snesor malfunction
Spiral cable malfunction
Center airbag sensor assembly malfunction
Steering wheel pad (D squib)
Front airbag sensor
Spiral cable
Center airbag sensor assembly
Wire harness
WIRING DIAGRAM

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Center Airbag
Sensor Assembly
Spiral
CableD Squib
(−) (+)D+
H18108
Center Airbag
Sensor Assembly
(−)(+)
+SL
+SR
DI−374
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Preparation. (See step 1 on page DI−396)
2 Check D squib circuit.
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 Go to step 6.
OK
3 Check front airbag sensor circuit. (Measure resistance between terminals +SR,
+SL of center airbag sensor assembly connector.)
CHECK:
Measure resistance between terminals +SR, +SL of harness
side connector of center airbag sensor assembly and body
ground.
OK:
Resistance: 755 − 855 Ω
NG Go to step 7.
OK

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Spiral
Cable
ACC ON
D−D+
or
DLC1
E1
Tc
Code 11
Center Airbag
Sensor Assembly
D Squib
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−375
1996 TOYOTA T100 (RM449U)
4 Check center airbag sensor assembly.
PREPARATION:
(a) Connect connector to center 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 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 11 is not output.
HINT:
Codes other than code 11 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 AB0118AB0119S08098W02042
H00352
H00325
Center Airbag
Sensor Assembly
Spiral
CableD Squib
ACC ON
or
DLC1
E1
Tc
Code 11
DI−376
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
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−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 11 is not output.
HINT:
Codes other than code 11 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. If malfunctioning part can not be detected
by imulation method, replace all SRS components including wire harness.

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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