1996 TOYOTA T100 check engine light

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Supplemental Restraint System Check Sheet
Date Problem Dist Occurred
Customer ’s Name
Registration No.
Registration Year
Frame No.
Odometer Reading
Weather
Temperature
Vehicle Operation
Road Conditions
Details of Problem
Vehicle Inspection, Repair
History Prior to Occurrence of
Malfunction (Including
Supplemental Restraint System)
Diagnosis System Inspection
SRS Warning Light
Inspection
DTC Inspection1st Time
2nd Time
1st Time
2nd TimeInspector ’s
Name
Fine Cloudy Rainy Snowy Other
Approx.
Starting Idling
Driving [ Constant speed Acceleration Deceleration
Other ]
Remains ON Sometimes Lights Up Does Not Light Up
Remains ON Sometimes Lights Up
Does Not Light Up
Normal Code Malfunction Code
Normal Code Malfunction Code[ Code. ]
[ Code. ]km
Miles //
//
// Date Vehicle Brought In DI−364
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
CUSTOMER PROBLEM ANALYSIS CHECK

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w/ Tachometer
w/o Tachometer
DI0XJ−02
S08098
E1 Tc
AT0716
Normal Code
ON
OFF0.25
0.25
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−365
1996 TOYOTA T100 (RM449U)
PRE−CHECK
1. SRS WARNING LIGHT CHECK
(a) Turn the ignition switch to ACC or ON and check that the
SRS warning light lights up.
(b) Check that the SRS warning light goes out after approx.
6 seconds.
HINT:
When the ignition switch is at ACC or ON and the SRS
warning light remains on or flashes, the airbag sensor as-
sembly has detected a malfunction code.
If, after approx. 6 seconds have elapsed, the SRS warn-
ing light sometimes lights up or the SRS warning light
lights up even when the ignition switch is OFF, a short in
the SRS warning light circuit can be considered likely.
Proceed to ”SRS warning light system malfunction” on
page DI−398, DI−400.
2. DTC CHECK (Using diagnosis check wire)
(a) Output the DTC.
(1) Turn the ignition switch to ACC or ON position and
wait approx. 20 seconds.
(2) Using SST, connect terminals Tc and E1 of the
DLC1.
SST SST 09843−18020
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
(b) Read the DTC.
Read the 2−digit DTC as indicated by the number of times
the SRS warning light blinks. As an example, the blinking
patterns, normal, 11 and 31 are as shown on the illustra-
tion.
Normal code indication:
The light will blink 2 times per second.
Malfunction code indication:
The first blinking output indicates the first digit
of a 2−digit DTC. After a 1.5 second pause,
the second blinking output will indicate the
second digit.

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− 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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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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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.

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ONAirbag Sensor Assembly
IG
2Acc
(+) (−)
AB0119AB0234H00351
ON
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−397
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Preparation.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect center airbag sensor assembly connector.
(c) Turn ignition switch ON. But do not start engine.
(d) Measure voltage between terminal IG
2 or ACC on con-
nector wire harness side of center airbag sensor assem-
bly and body ground, and operate electric system (defog-
ger, wiper, headlight, heater blower, etc.).
Voltage: 6 V − 11.5 V at IG
2 and ACC
(e) Turn electric system switch OFF.
(f) Turn ignition switch to LOCK.
(g) Remove voltmeter and connect center airbag sensor as-
sembly connector.
2 Does SRS warning light turn off?
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Connect steering wheel pad connector.
(c) Connect center airbag sensor assembly connector.
(d) Turn ignition switch ON.
CHECK:
Operate electric system (defogger, wiper, headlight, heater
blower, etc.), and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, perform trou-
bleshooting for DTC. If a normal code is output,
replace center airbag sensor assembly.
YES
From results of above inspection, malfunctioning part can now be considered normal. To make
sure of this, use simulation method to check.

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LOCK
Center Airbag
Sensor Assembly
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−399
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Does SRS warning light turn off?
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (−) terminal cable from the battery,
and wait at least 90 seconds.
(c) Disconnect center airbag sensor assembly connector.
(d) Connect negative (−) terminal cable to battery.
CHECK:
Check operation of SRS warning light.
NO Check SRS warning light circuit or terminal AB
circuit of DLC1.
YES
Replace center airbag sensor assembly.