1996 TOYOTA T100 battery

Downloaded from www.Manualslib.com manuals search engine R15207
Center Airbag
Sensor Assembly
Relay Block
No.2
ECU−B SRS Warning Light
Battery
Short
ConnectorY−B Y−B
P−B P−B
P−B P−B Y−B
P−B
DLC1
TC
LA Tc
ABIE1
IE2
IA3 W
WYR
ALT
7
21211 2
2 1
2
58 6
8
5 11
22 11 DI−398
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
SRS Warning Light Circuit Malfunction (Always lit up, when
ignition switch is in LOCK position.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
DI98A−01

Downloaded from www.Manualslib.com manuals search engine H18115
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.

Downloaded from www.Manualslib.com manuals search engine H18116
Airbag Sensor Assembly
LA
(−)
(+)ON
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−401
1996 TOYOTA T100 (RM449U)
3 Preparation. (See step 1 on page DI−396)
4 Check SRS warning light circuit.
PREPARATION:
(a) Connect negative (−) terminal cable to battery.
(b) Turn ignition switch to ACC or ON.
CHECK:
Measure voltage LA terminal of harness side connector of cen-
ter airbag sensor assembly and body ground.
OK:
Voltage: 10 − 16 V
NG Check SRS warning light bulb/repair SRS
warning light circuit.
OK

Downloaded from www.Manualslib.com manuals search engine AB0118AB0119W05587W05586
H00350
H00346
Center Airbag
Sensor Assembly
Spiral
CableD Squib
ACC ON
w/o Tachometer w/ Tachometeror
DI−402
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
5 Does SRS warning light come on?
PREPARATION:
(a) Disconnect negative (−) terminal cable from the battery.
(b) Connect center airbag sensor assembly connector.
(c) Connect negative (−) terminal cable to battery, and wait
at least 2 seconds.
(d) Turn ignition switch to ACC or ON.
CHECK:
Check operation of SRS warning light.
OK:
SRS warning light comes on.
NO Check terminal LA of center airbag sensor
assembly. If normal, 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.
6 Is new ECU−B fuse burnt out again?
NO Using simulation method, reproduce
malfunction symptoms. (See page IN−16)
YES
Check harness between ECU−B fuse and
SRS warning light.

Downloaded from www.Manualslib.com manuals search engine H18117
LOCK Airbag Sensor Assembly
Tc
(+) (−)
DI−406
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
4 Check center airbag sensor assembly.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (−) terminal cable from the battery,
and wait at least 90 seconds.
(c) Remove steering wheel pad (See page SR−13 or
SR−26).
(d) Disconnect center airbag sensor assembly connector.
(e) Insert service wire into terminal Tc from back side as
shown.
(f) Connect center airbag sensor assembly connector with
service wire.
(g) Connect negative (−) terminal cable to battery.
(h) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(i) Connect service wire of terminal Tc to body ground.
CHECK:
Check operation of SRS warning light.
OK:
SRS waning light comes on.
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this cause a malfunction.
OK Check harness between center airbag sensor
assembly and DLC1.
NG
Replace center airbag sensor assembly.

Downloaded from www.Manualslib.com manuals search engine R14303
Airbag Sensor Assembly
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−407
1996 TOYOTA T100 (RM449U)
If DTC is displayed without DTC check procedure, perform following trouble-
shooting:
1 Check resistance between terminal Tc of center airbag sensor assembly and
body ground.
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.
CHECK:
Check resistance between terminal Tc of center airbag sensor
assembly connector and body ground.
OK:
Resistance: 1MΩ or Higher
NG Repair or replace harness or connector.
OK
Replace center airbag sensor assembly.

Downloaded from www.Manualslib.com manuals search engine I22687
DI−434
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECU. When the ECU receives
this signal, it cancels the cruise control.
A fail−safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP−
When the brake is ON, battery positive voltage is normally applied through the STOP fuse and stop light
switch to terminal STP− of the ECU, and the ECU turns the cruise control OFF.
If the harness connected to terminal STP− has an open circuit, terminal STP− will have battery positive volt-
age and the cruise control will be turned OFF.
Also, when the brake is ON, the magnetic clutch circuit is cut mechanically by the stop light switch, turning
the cruise control OFF (See page DI−422 for operation of the magnetic clutch).
WIRING DIAGRAM
DI355−02

Downloaded from www.Manualslib.com manuals search engine I00018
GND
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−451
1996 TOYOTA T100 (RM449U)
3 Check resistance between terminal GND of cruise control ECU connector and
body ground (See page IN−16).
CHECK:
Measure resistance between terminal GND of ECU connector
and body ground.
OK:
Resistance: Below 1 Ω
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween cruise control ECU and battery (See
page IN−26).