1996 TOYOTA LAND CRUISER warning light

DI5Q6−01
DI−246
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
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 lights up even when ignition switch is in the
LOCK position.
SRS warning light system malfunction
(Always lit up when ignition switch is in LOCK position.)DI−274
With the ignition switch at ACC or ON, the SRS warning lights
does not light up.SRS warning light system malfunction
(Does not light up when ignition switch is turned to ACC or
ON.)
DI−276
DTC not displayed.
 SRS warning light is always lit up with a DTC check procedure.
 DTC displayed without Tc and E1 terminal connection.
Tc terminal circuitDI−279
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R13678
Airbag Sensor
Assembly
Battery F/B
R/B No.2
2
2
1
1
36 4
6 10
9
S4
GR
B
W
L−R
B−L
B−R ACC
IG2
A
IGN
AM1
AM2
FL BLOCK
W−R
B−L
W−R
Ignition
Switch
B
EA2
EA2
4
11 3
CIG
J3 Junction
Connector
GR 4
33
S5 S5
S4
A
2 2
50A AM1
2
2
Short ConnectorGR
B−W
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−271
1996 LAND CRUISER (RM451U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage −increase circuit (DC−DC converter) in the airbag sensor assembly 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 ind\
icated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.DTC Detection ConditionTrouble Area
NormalSource voltage dorp Battery
 Airbag sensor assembly
WIRING DIAGRAM
DI5QC−03
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H00003
ON
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−273
1996 LAND CRUISER (RM451U)
3 Does SRS warning light turn off?
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Connect steering wheel pad connector.
(c) Connect front passenger airbag assembly connector.
(d) Connect airbag sensor assembly connector.
(e) Turn ignition switch ON.
CHECK:
Operate electric system (defogger, wiper, headlight, heater
blower, etc.) and check that SRS warning light goes off.
NO Check DTC, if a DTC is output, perform trouble-
shooting according to DTC, if a normal code is
output, replace airbag sensor assembly.
YES
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.
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R13679
BatteryFL BLOCK 2
MAIN
W
W
ECU−B
1
F/B
S7
B−R
2
3
SRS Warning
Light
8LA
Tc
B−Y8
IH1 Airbag Sensor
Assembly
DLC1
5 W−L
11
GENERATOR
(ALTERNATOR)
W
Cruise Control ECU
W−L
W−L
B−Y
B−Y
IH1 S7 S6
S6
Short Connector
Short Connector W−L
B−L
11
12
3
EA3 11
22
7
DI−274
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
SRS Warning Light System Malfunction (Always lit up, when igni-
tion 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
DI5QD−03
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H00094
Airbag Sensor
Assembly
Spiral
Cable
P squib
D squib LOCK
AB0117
N12639
H00026
Airbag Sensor Assembly
LOCK
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−275
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Preparation.
PREPARATION:
(a) Disconnect negative ( −) terminal cable from the battery,
and wait at least 90 seconds.
(b) Remove steering wheel pad. (See SR section)
(c) Disconnect connector of front passenger airbag assem- bly. (See page RS−22 )
CAUTION:
Store the steering wheel pad with the front surface facing
upward.
2 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 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 airbag sensor assembly.
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N14677
Fuse
DI−276
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
SRS Warning Light System Malfunction (Does not light up, when
ignition switch is turned to ACC or ON.)
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
Refer to page DI−274 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check ECU−B Fuse.
PREPARATION:
Remove ECU−B fuse.
CHECK:
Check continuity of ECU −B fuse.
OK:
Continuity
HINT:
Fuse may be burnt out even if it appears to be OK during
visual inspection.
If fuse is OK, install it.
NG Go to step 5.
OK
2 Preparation. (See step 1 on page DI−271)
DI5QE−03
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AB0119
R14302H00027
Airbag Sensor Assembly
ON
LA
(−)(+)
H00051
Airbag Sensor
Assembly
P Squib
D Squib Spiral
Cable
ON
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−277
1996 LAND CRUISER (RM451U)
3 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 air-
bag sensor assembly.
OK:
Voltage: 10 − 14 V
NG Check SRS warning light bulb/repair SRS warn-
ing light circuit.
OK
4 Does SRS warning light come on?
PREPARATION:
(a) Disconnect negative ( −) terminal cable from the battery.
(b) Connect 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.
NO Check terminal LA of airbag sensor assembly. If normal, replace airbag sensor assembly.
YES
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.
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DI−278
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
5 Is new ECU−B fuse burnt out again?
NO Using simulation method, reproduce malfunc-
tion symptoms (See page IN−18 ).
YES
Check harness between ECU −B fuse and
SRS warning light.
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