TOYOTA T100 1996 Factory Service Manual

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W05586 W05587
H00319
TerminalTime of Body ground
Tc
ABOFF
Body
Ground
OFF
Body
Ground
Several
seconds50 msec.
50 msec. OFF ON
1 second
(± 0.5 sec.)1 second
(± 0.5 sec.)”1””3” ”5”
”2” ”4”
w/ Tachometer w/o TachometerAB
Tc
S07739
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−367
1996 TOYOTA T100 (RM449U)
(d) Several seconds after doing the clearing procedure, the
SRS warning light will blink in a 50 msec. cycle to indicate
the codes have been cleared.
5. DTC CLEARANCE (Using TOYOTA hand−held tester)
(a) Hook up the TOYOTA hand−held tester to the DLC1.
(b) Clear the DTCs by following the prompts on the tester
screen.
HINT:
Please refer to the TOYOTA hand−held tester operator’s manu-
al for further details.
6. RELEASE METHOD OF AIRBAG ACTIVATION PRE-
VENTION MECHANISM
An airbag activation prevention mechanism is built into the con-
nector for the squib circuit of the SRS.
When release of the airbag activation prevention mechanism is
directed in the troubleshooting procedure, as shown in the il-
lustration of the connectors ”1” and ”2” below, insert paper
which is the same thickness as the male terminal, between the
terminal and the short spring.

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AB0130 AB0045AB0046AB0027
H00320
Airbag Sensor Assembly Connector (Connector ”1”)
Spiral Cable Connector (Connector ”2”)
Short SpringShort Spring
Before Release
After Release After Release Before Release
PaperPaper
Center
Airbag
Sensor
AssemblyJ/B No.1
Squib
RH and LH Front Airbag Sensors Spiral Cable Connector ”1” Connector ”2”
DI−368
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
CAUTION:
Never release the airbag activation prevention mechanism
on the steering wheel pad connector.
NOTICE:
Do not release the airbag activation prevention mech-
anism unless specifically directed by the trouble-
shooting procedure.
If the paper inserted is too thick the terminal and short
spring may be damaged, so always use paper the
same thickness as the male terminal.

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.

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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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DI−372
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
SymptomSuspect AreaSee page
With the ignition switch at ACC or ON, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed.
SRS warning light is always lit up even when ignition switch is in
the LOCK position.
SRS warning light circuit
(Always lit up when ignition switch is in LOCK position.)DI−398
With the ignition switch at ACC or ON, the SRS warning lights
does not light up.SRS warning light circuit
(Does not light up when ignition switch is turned to ACC
or ON.)
DI−400
DTC not displayed.
SRS warning light is always lit up a DTC check procedure.
DTC displayed without Tc and E1 terminal connection.
Tc terminal circuitDI−403

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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

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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.